Wireless Network Analyst Interview Questions & Answers

1

What is a Proxy Server?

Reference answer

A proxy server is a computer or system that works like a middleman between your device and the internet. It is used for better security, privacy, control, and faster access to some websites. If you want to open a website on your browser, you just type the address, and it will open the website. But when a proxy server is used, your request first goes to the proxy server, which then sends it to the website. Why do companies use a proxy server? There are many reasons for using a proxy server. Here are some important ones: - Security: A proxy server hides the real IP Address of users. It can help protect systems from hackers. - Control: Companies use it to block websites like games or social media during work hours. - Faster Browsing: Some proxy servers save copies of websites in memory. If the user reloads this website, the server will serve it faster. - Privacy: A proxy server can hide the real identity of the user by showing its own server.

2

How does network slicing guarantee isolation between different slices?

Reference answer

Ensuring isolation between network slices is crucial for preventing interference and maintaining service quality. Network slicing achieves isolation through dedicated resources and logical separation. Each slice operates independently, with its own set of resources, ensuring that changes or issues in one slice do not impact the performance or security of others.

3

What is Symmetric and Asymmetric Encryption?

Reference answer

Symmetric Encryption entails the use of a single Cryptographic key for both Encryption and Decryption operations. Employing Symmetric Encryption algorithms like AES or DES, plaintext data is encrypted into ciphertext. This process requires a shared secret key securely distributed between communicating parties. On the other hand, Asymmetric Encryption, or Public-key Cryptography, utilises a pair of mathematically related keys. A public key for Encryption and a private key for Decryption. This enables secure communication between parties without the need to share a secret key.

4

What is a VLAN and why are VLANs used?

Reference answer

A VLAN (Virtual Local Area Network) is a logical grouping of network devices that allows them to communicate as if they were on the same physical network segment, regardless of their actual physical location. It enables network administrators to segment a network into broadcast domains. VLANs are used for several reasons. Primarily, they enhance security by isolating sensitive data and traffic. Secondly, they improve network performance by reducing broadcast traffic within each VLAN. Finally, they simplify network management by allowing administrators to group users and devices based on function or department rather than physical location, making moves, adds, and changes easier.

5

What is a Wi-Fi analyzer?

Reference answer

A Wi-Fi analyzer is a tool that scans for nearby wireless networks and provides information about their signal strength, channel usage, and security settings. It helps identify interference sources and optimize network performance.

6

Explore the differences between 5G RAN and its predecessors.

Reference answer

The transition from earlier generations to 5G RAN entails significant advancements. Notably, 5G delivers substantially higher data rates, offering faster downloads and reduced latency for an enhanced user experience. The ultra-low latency of 5G is pivotal for applications requiring real-time responsiveness, such as autonomous vehicles. Additionally, 5G RAN accommodates a greater number of connected devices per unit area, addressing the escalating demand for the Internet of Things (IoT) and facilitating a more interconnected environment. The introduction of network slicing is a distinctive feature, allowing the creation of virtual networks tailored to specific applications and ensuring efficient resource allocation. Moreover, the incorporation of advanced antenna technologies like massive MIMO enhances spectral efficiency.

7

What is a vulnerability scan and why is it performed?

Reference answer

A vulnerability scan is an automated process that identifies security weaknesses in a network or system. It is performed to detect vulnerabilities before they can be exploited by attackers. Regular vulnerability scans help organizations maintain a proactive security posture and address potential issues before they lead to breaches.

8

Can you describe a challenging network security issue you faced and how you resolved it?

Reference answer

(Provide a specific example from your experience) For instance, I once faced a challenge with a sophisticated multi-vector DDoS attack targeting our company's online services. To resolve it, I coordinated with our DDoS protection service provider to implement rate limiting and traffic filtering. Simultaneously, I worked with the IT team to enhance our network infrastructure with additional redundancy and load balancing. Post-attack, we conducted a thorough review to update our incident response plan and improve our DDoS defense mechanisms.

9

What is Cross-Site Scripting (XSS)?

Reference answer

XSS allows attackers to insert malicious scripts into web applications to steal user data or perform unauthorized actions. Prevention includes validating and escaping input data and using Content Security Policies (CSP).

10

What is cloud computing?

Reference answer

Cloud computing is like renting computer resources (servers, storage, software) over the internet, instead of owning and maintaining them yourself. Think of it like renting an apartment instead of buying a house. You only pay for what you use, and the provider takes care of all the maintenance and upkeep. Instead of running applications and storing data on your own servers or personal computer, you access them via the cloud provider's infrastructure. This offers benefits like scalability (easily increase or decrease resources as needed), cost savings (pay-as-you-go model), and accessibility (access your data and applications from anywhere with an internet connection).

11

What are some factors that can affect wireless signal strength?

Reference answer

Factors affecting wireless signal strength include: - Distance from the WAP: Signal strength decreases as distance increases. - Obstacles: Walls, furniture, and metal objects can obstruct signals. - Interference: Other wireless devices operating on the same frequency can cause interference. - Antenna type: Different antenna types have varying signal patterns and ranges.

12

What are 25 cybersecurity interview questions?

Reference answer

25 cybersecurity interview questions with role-adjusted answer frames for junior candidates, career switchers, and mid-level analysts — plus the concepts.

13

What is the master controller mode on WLC?

Reference answer

Master Controller Mode: Designates a controller as the tie-breaker when multiple controllers are available.

14

What is a firewall?

Reference answer

Firewalls serve as a protective barrier between a private network and external networks, managing the flow of traffic based on set security rules. They are vital for blocking unauthorized access and mitigating potential cyber threats, thus safeguarding the network perimeter.

15

What is network segmentation and what are its benefits?

Reference answer

Network segmentation divides a network into smaller, isolated subnetworks, often using VLANs. This offers several key benefits. It significantly improves security by limiting the 'blast radius' of security breaches. If one segment is compromised, the impact is contained, preventing the entire network from being affected. Segmentation can also enhance performance by reducing broadcast traffic within each segment. This reduces congestion and improves overall network efficiency. It also simplifies network management by allowing administrators to manage smaller, more manageable units.

16

Have you implemented MIMO processes before?

Reference answer

This question assesses the candidate's experience with Multiple Input Multiple Output (MIMO) technology, which improves throughput and reliability in wireless networks.

17

What is the difference between WiFi and Bluetooth?

Reference answer

WiFi falls under the WLAN category, while Bluetooth falls under the WPAN category. WLAN specifications are published under IEEE 802.11, and Bluetooth under IEEE 802.15 standards. Bluetooth is the standard for wireless personal area networks or WPANs. It allows high-speed transmission of data over very short distances.

18

What are the key differences between IPv4 and IPv6?

Reference answer

IPv4 and IPv6 are both protocols used for sending data across networks, but there are several key differences between them: Address Length: The most noticeable difference is the length of the IP addresses. IPv4 uses 32-bit addresses, which gives us a little over 4 billion unique addresses. In contrast, IPv6 uses 128-bit addresses. That's a huge number of possible addresses, helping alleviate concerns about IP address exhaustion. Address Format: IPv4 addresses are displayed in decimal format, separated by periods (for example, 192.0.2.0). IPv6 addresses, on the other hand, are shown in hexadecimal and separated by colons, like 2001:0db8:85a3:0000:0000:8a2e:0370:7334. Header Structure: The IPv6 header has a simpler structure than the IPv4 header, which can streamline processing and improve performance. One noticeable change is that in IPv6, the checksum field is eliminated because error checking is handled by the transport layer. Auto-configuration: IPv6 has an auto-configuration capability that allows devices to automatically configure an IP address and other parameters without needing a server or manual configuration. These changes make IPv6 better at catering to the growing number of internet devices and more efficient at handling data traffic. However, migration to IPv6 is a slow process because it requires significant changes to network infrastructure.

19

What is your understanding of the network engineer role, and what qualities make an excellent network engineer?

Reference answer

A network engineer designs, implements, maintains, and manages network systems. Key qualities include strong foundational knowledge, practical experience, problem-solving abilities, continuous learning, and keen insight into new technologies. Soft skills such as teamwork, communication, and customer service are also essential.

20

What is ESS?

Reference answer

ESS (Extended Service Set): Created by connecting multiple BSSs via a distribution system, allowing larger coverage and seamless client roaming.

21

Describe a time when you diagnosed and resolved a network issue that was impacting business operations.

Reference answer

At my previous role with Telus, we experienced frequent outages in our VPN service affecting remote employees. I utilized network monitoring tools to identify a misconfigured router. I collaborated with the networking team to reconfigure the settings, which eliminated the outages. This experience taught me the importance of thorough documentation and proactive monitoring, leading to a 30% decrease in network-related support tickets.

22

Name some services provided by the application layer in the Internet model?

Reference answer

Some services provided by the application layer in the Internet model are as follows: - Mail services - Directory services - File transfer - Access management - Network virtual terminal

23

Which of the following wireless security protocols is considered the most secure and recommended for modern Wi-Fi networks?

Reference answer

WPA3

24

What is an XML External Entity (XXE) Vulnerability in Web Applications?

Reference answer

XXE vulnerabilities allow the reading of local files by exploiting malicious XML. Prevention includes disabling external entities and validating XML inputs.

25

What is a star topology and what are its characteristics?

Reference answer

The star topology is a type of network configuration where all devices, or 'nodes', are connected to a central device, such as a switch or a hub. Just imagine a star: the central device is in the middle, and the nodes branch out from its center like the points of a star. In a star topology, data transmissions from any node go through the central device, which then either forwards the data to the intended recipient node or broadcasts it to all nodes. This setup allows for easy fault detection and isolation since a malfunctioning node does not affect others. Additionally, adding or removing nodes is relatively easy and doesn't disturb the entire network's activity. Because the nodes are not directly interconnected, you only need to connect or disconnect them from the central device. The star topology is most commonly used in modern Ethernet LANs (Local Area Networks), including home, business, and school networks. It supports robustness (if one link fails, the rest of the network remains operational), simplifies management and troubleshooting, and is compatible with mass-market network devices like routers and switches. However, the central device's failure can bring down the whole network, and more cable length is required compared to other topologies, like a Bus topology.

26

What is the OSI model and what are its seven layers?

Reference answer

The OSI (Open Systems Interconnection) model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven abstraction layers. Each layer has a specific function and interacts with the layers directly above and below it. Here's a brief overview of each layer: 1. Physical (Layer 1): Transmits raw bit streams over the physical medium (cables, radio waves). 2. Data Link (Layer 2): Provides node-to-node data transfer, handles physical addressing (MAC), and error detection. 3. Network (Layer 3): Handles logical addressing (IP) and routing packets across networks. 4. Transport (Layer 4): Provides reliable or unreliable data delivery, segmentation, and flow control (TCP/UDP). 5. Session (Layer 5): Manages sessions and connections between applications. 6. Presentation (Layer 6): Translates data formats, handles encryption/decryption, and compression. 7. Application (Layer 7): Provides network services directly to end-user applications (HTTP, FTP, SMTP).

27

How would you design a network for a new office, considering security, scalability, and budget?

Reference answer

Designing a network for a new office starts with understanding the business requirements: number of users, applications used, and growth projections. Security is paramount; I'd implement a firewall, VLANs to segment traffic, and strong password policies. A guest Wi-Fi network with its own firewall rules is crucial. We'll also assess needs for VPN access for remote workers. For scalability, I would choose network devices that support future expansion and consider cloud-based solutions where appropriate. Budget is a key constraint, so I'd evaluate cost-effective solutions without compromising security or performance. A phased rollout, starting with essential services and gradually adding features, can help manage costs. Consider open-source solutions where viable alternatives exist. Consider the location of servers or if they can be cloud-based.

28

Can you describe a time you managed a network outage?

Reference answer

Yes, in a previous role, we experienced a network outage caused by a major hardware failure. I managed it by quickly identifying the problem, coordinating with the hardware vendor for immediate replacement, keeping stakeholders informed throughout the process, and implementing a temporary workaround to restore partial functionality until the hardware was fully operational.

29

How does beamforming improve wireless network performance?

Reference answer

Beamforming directs the wireless signal towards specific devices rather than broadcasting it in all directions. This focused signal improves signal strength, range, and data rates, resulting in better performance and reduced interference.

30

What is a troubleshooting-driven guide to network interview questions?

Reference answer

A troubleshooting-driven guide to network interview questions, with answer frameworks, follow-up probes, and a realistic incident walkthrough covering OSI.

31

What is Wi-Fi?

Reference answer

Wi-Fi is a wireless networking technology that allows devices to connect to a network using radio waves, typically based on IEEE 802.11 standards.

32

Explain the concept of network bottlenecks and methods to identify them.

Reference answer

Network bottlenecks occur when specific points or components limit data transmission rates. They can be identified through performance testing, traffic analysis, and device utilization monitoring. Addressing bottlenecks may involve upgrading hardware, optimizing configurations, or increasing bandwidth.

33

A user reports they cannot access the internet. What are the first three things you would check?

Reference answer

Look for a systematic approach, starting with basic connectivity checks like verifying the network cable and IP address. They should also mention checking the default gateway and DNS settings.

34

What are the key processes involved in DHCP?

Reference answer

DHCP (Dynamic Host Configuration Protocol) automates IP address assignment and configuration. Key processes include discovery, offer, request, and acknowledgment.

35

Where is the best spot to introduce an Anti-infection program?

Reference answer

An enemy of infection program should be introduced on all workers and workstations to guarantee assurance. That is on the grounds that singular clients can get to any workstation and present a PC infection. You can connect their removable hard drives or blaze drives.

36

Is it true that Wireless networking is only good for laptop computer?

Reference answer

- Although wireless networking offers obvious benefits to users of laptops who move from location to location throughout the day, there are benefits for users of fixed position computers as well: - So this is not such that wireless networking is only good for laptop computers but on preference basis it got more than fixed positions, as laptop computers are portable, flexible, ease to use and move. - Many schools and businesses have unsuitable building layouts or walls that cannot be wired for various reasons making it difficult or impossible to build a wired network. Wireless networking in these environments is a very cost effective alternative also providing future flexibility. - In cases where a small number of computers are separated from a main network a wireless link may be more cost effective than network cabling although the latter is perfectly feasible. - Temporary wireless LANs can easily be created for exhibitions, school or business projects, all without any trailing cabling.

37

Who are the providers and what are the assets available for wireless?

Reference answer

Some of the providers for wireless are as follows:- a) Wireless Internet- Nationwide Coverage Unlimited b) Faster Internet on Mobile c) New 3G BlackBerry d) Aircel Pocket Internet e) Reliance 3G Online Offer f) Cisco Managed Switches Brand assets are available here for wireless, brand assets can also be applied to m-branding. In particular, three of the assets can be targeted directly for improvement with the m-branding methods that are available today. These are brand awareness, brand associations and brand loyalty.

38

Explain ACLs (Access Control Lists).

Reference answer

ACLs filter traffic based on IP, protocol, or port. Types: - Standard ACL: Filters by source IP. - Extended ACL: Filters by source, destination, protocol, and port.

39

What is QoS (Quality of Service) in a network?

Reference answer

QoS involves managing network traffic to ensure performance for high-priority applications. Techniques include: - Traffic Shaping: Controls the rate of outbound traffic to smooth out bursts and maintain a steady flow. - Queuing: Manages packets in different queues based on priority or traffic type, ensuring orderly processing. - Prioritization: Assigns different priority levels to various types of traffic, ensuring that higher-priority traffic is processed first.

40

What bracket of network engineer salary are you looking for?

Reference answer

If youâ€™re asked this question during your interview, be sure to give a respectful and realistic answer. To construct your answer, do some research into the salary brackets of a network engineer, taking into account the following: Your level of experience, What youâ€™re currently earning, Your location, Whether the role is a contract or permanent position, If the role is onsite, remote or a combination of both, Other offers youâ€™ve recently had, What other companies are offering, The size of the organisation and what you could realistically expect them to offer you. To give you an idea of what to expect salary-wise from your potential future employer, hereâ€™s what you could earn as a network engineer, according to Glassdoor. Entry-level network engineer salary: Â£34,000, Average network engineer salary UK: Â£45,000, Senior network engineer salary: Â£61,000. Hereâ€™s how you could answer this type of network engineer interview question: â€œBased on my level of experience as a network engineer and research I have conducted around the position youâ€™re offering, I would be grateful for you to offer me â€˜Xâ€™ for this position.â€ Of course, the employer may have stated the network engineer salary they are offering or a bracket based on your experience. Donâ€™t be afraid to negotiate what the employer is offering, but like we say, be respectful if doing so.

41

What are Routers?

Reference answer

Routers are Networking devices which transfer data between networks. They operate at the Network Layer and use IP addresses to route traffic. Routers determine the best paths for data using routing protocols and tables, facilitating communication between networks. They offer functions like packet forwarding, NAT, QoS, and firewalling.

42

What is ICMP?

Reference answer

ICMP is an Internet Control Message Protocol. It gives informing and correspondence to conventions inside the TCP/IP stacks. This is likewise the convention that oversees blunder messages that are utilized by network apparatuses like PING.

43

Explain VPN (Virtual Private Network).

Reference answer

A VPN creates secure, encrypted tunnels between remote users or offices and a central network. Protocols: IPsec, SSL, L2TP, GRE.

44

What is RAS?

Reference answer

RAS stands for Remote Access Service in Networking. It refers to the protocols and features that enable remote users to safely connect to a network through a communication link, such as a dial-up connection or a VPN. RAS allows users to interact with network services and resources as if devices were directly linked to the network.

45

What is the role of a rogue AP detection system?

Reference answer

A rogue AP detection system identifies unauthorized or insecure access points that may be connected to the network. It helps prevent potential security breaches by alerting administrators to unauthorized devices that could compromise network integrity.

46

Explain the Importance of Network Monitoring Tools.

Reference answer

Monitoring tools like SolarWinds, PRTG, Wireshark, and Cisco Prime Infrastructure help analyze bandwidth, detect failures, and ensure SLA compliance.

47

What is Authorization?

Reference answer

Authorization provides capabilities to enforce policies on network resources after the user has gained access to the network resources through authentication. After the authentication is successful, authorization can be used to determine what resources is the user allowed to access and the operations that can be performed.

48

What is a server farm?

Reference answer

A server farm is a set of many servers interconnected together and housed within the same physical facility. A server farm provides the combined computing power of many servers by simultaneously executing one or more applications or services. A server farm is generally a part of an enterprise data center or a component of a supercomputer. A server farm is also known as a server cluster or computer ranch.

49

Describe a time you solved a network connectivity issue using diagnostic tools.

Reference answer

At my internship with Cisco, I encountered a recurring connectivity issue in our office network. I used Wireshark to analyze the traffic and identified that a misconfigured switch was causing packet loss. I collaborated with a senior analyst to implement the necessary configuration changes, which restored connectivity. This experience taught me the importance of thorough analysis and seeking help when needed.

50

How would you describe what a router is?

Reference answer

Knowing how to prepare for network engineer interview questions which require you to demonstrate a level of technical expertise to the interviewer, like the one above, can be answered like so. â€œA router is a hardware component responsible for facilitating communication between various networks and devices. The key functions of a router encompass managing interactions between distinct networks, determining the optimal paths for device communication, as well as forwarding and filtering packets to ensure efficient data transmission.â€

51

What is Wi-Fi and what is WiMAX?

Reference answer

Wi-Fi: Wireless Fidelity, a technology that uses radio waves for high-speed network connectivity based on IEEE 802.11 standards. Devices include PCs, laptops, video game consoles, phones, tablets, smart TVs, and more. WiMAX: Worldwide Interoperability for Microwave Access, referenced by IEEE 802.16, commonly termed 4G. It provides wide area network access and uses OFDM modulation.

52

What are the advantages and disadvantages of piggybacking?

Reference answer

Advantages of Piggybacking: The major advantage of piggybacking is the better use of available channel bandwidth. Disadvantages of Piggybacking: The major disadvantage of piggybacking is additional complexity and if the data link layer waits too long before transmitting the acknowledgment, then re-transmission of the frame would take place.

53

Define HTTPS protocol?

Reference answer

The full form of HTTPS is a Hypertext transfer protocol secure. It is an advanced version of the HTTP protocol. Its port number is 443 by default. It uses SSL/TLS protocol for providing security.

54

What is the significance of the OSI model?

Reference answer

The Open Systems Interconnection (OSI) model is a conceptual framework that standardizes the functions of a communication system into seven categories, known as layers. The primary significance of the OSI model is that it allows different devices and applications to communicate with one another, regardless of their underlying hardware and software technology. By defining these universal standards, it helps guarantee compatibility and interoperability between different network technologies. Another key benefit of the OSI model is its layered approach. Each layer performs a specific function and is only concerned with the layer directly above and below it, providing a degree of separation that simplifies troubleshooting and the development of new protocols. If an issue arises, you can pinpoint at which layer the problem exists and address it from there. This modular design also allows innovation to happen at individual layers without affecting the others. So, while network professionals might not work with the OSI model daily, its principles are fundamental to understanding how networks operate and how different networking components interact with each other.

55

Can you explain the key features and benefits of Wi-Fi 7 and how it improves upon previous Wi-Fi generations?

Reference answer

Wi-Fi 7 was released in early 2024. Your understanding of and familiarity with Wi-Fi 7 stands as an important talking point in wireless network engineering interviews. Indeed, hiring managers evaluate candidates' understanding of new and upcoming standards and their potential impact on network infrastructure. Hiring managers want to be sure that a candidate works to learn as much as possible about emerging technologies, so when answering questions about Wi-Fi 7, highlight major improvements over its predecessors. Remember, the key to nailing these tougher questions is to demonstrate your depth of understanding while still communicating clearly and concisely. Managers are looking for candidates who can not only grasp complex concepts but also explain them to others.

56

What is the distinction between a straight-through and hybrid link?

Reference answer

A straight-through link is utilized to associate PCs to a switch, center, or switch. A hybrid link is utilized to associate two comparable gadgets, like a PC to PC or Hub, to the Hub.

57

What is a firewall and why do we need it?

Reference answer

A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between a trusted internal network and an untrusted external network, such as the internet. We need firewalls to protect our systems and data from unauthorized access, malicious attacks (like viruses and malware), and data breaches. They help prevent hackers from gaining access to sensitive information and disrupting our network operations. They inspect network traffic, blocking malicious packets and allowing legitimate communication based on the defined rules.

58

What is a hub-to-hub connection?

Reference answer

A hub-to-hub connection refers to a direct connection between two computers on a network. A hub-to-hub connection does not need any other network devices besides connecting a cable to the NIC cards of the two computers.

59

Describe the concept of wireless spectrum and its importance.

Reference answer

Wireless spectrum refers to the range of radio frequencies used for wireless communication. It is important because it determines the capacity, coverage, and performance of wireless networks. Proper management of spectrum helps avoid interference and optimize network performance.

60

What are your strengths?

Reference answer

This question helps identify a candidate's key professional strengths relevant to wireless network engineering.

61

What is the use of a proxy server?

Reference answer

Proxy servers are used for securing a network from external users who might want to intrude into the network. It makes a computer system virtually invisible to others. A proxy server has a list of harmful websites so that the main network is protected. When it receives a request, it collects the data from the target web server and processes it. The response is then forwarded to the user.

62

How do you configure wireless QoS for VoIP calls?

Reference answer

To configure wireless QoS for VoIP: - - Define a QoS policy for voice traffic. - Apply the policy to the appropriate WLAN or SSID. - Use priority tags (e.g., DSCP values) to prioritize voice packets. - Configure access points and controllers to enforce QoS settings.

63

How can you defend against Distributed Denial of Service (DDoS) attacks?

Reference answer

Defending against Distributed Denial of Service (DDoS) attacks requires a multi-layered approach. Rate limiting restricts the number of requests from a specific source. Traffic filtering, using ACLs and BGP flowspec, blocks malicious traffic patterns. Intrusion Detection/Prevention Systems (IDS/IPS) identify and block attack signatures. DDoS mitigation services, either cloud-based or on-premise, can absorb large volumes of attack traffic. Over-provisioning bandwidth provides additional capacity. Using a Content Delivery Network (CDN) distributes traffic, making it harder to overwhelm the origin server.

64

What is the maximum data rate for the 802.11a standard?

Reference answer

The maximum data rate for 802.11a is up to 54 Mbit.

65

What are the differences between WPA2-PSK and WPA2-Enterprise?

Reference answer

WPA2-PSK (Pre-Shared Key) uses a shared passphrase for authentication, suitable for small networks. WPA2-Enterprise uses an authentication server (e.g., RADIUS) for individual user credentials, offering enhanced security and scalability for larger networks.

66

What are Head of HR interview questions?

Reference answer

Head of HR interview questions with a weighted competency matrix, a 5-point scoring rubric, and seniority signals for strategy, leadership, compliance.

67

What is Network Address Translation (NAT) and how does it impact network security?

Reference answer

Network Address Translation (NAT) is a technique used to remap one IP address space into another by modifying network address information in the IP header of packets while they are in transit across a traffic routing device. A common use case is to enable multiple devices on a private network to share a single public IP address when communicating with the internet. NAT can impact network security in several ways. On one hand, it provides a degree of security by hiding the internal network structure and IP addresses from the outside world, making it harder for attackers to directly target internal devices. On the other hand, NAT can complicate certain security protocols, such as IPSec, and can make it more difficult to trace malicious activity back to the originating internal device. Additionally, applications that rely on end-to-end connectivity may not function correctly behind NAT without specific configurations like port forwarding. Some also consider NAT to be security through obscurity which is generally not an effective security strategy.

68

What are 25 administrative assistant interview questions?

Reference answer

25 administrative assistant interview questions with answer frameworks, model answer angles, and the specific skills interviewers are actually screening for.

69

What do you mean by NIC?

Reference answer

NIC stands for Network Interface Card, also called an Ethernet card or a network adapter. This is a hardware component that is essential for connecting the computer to a network. NIC is a card that is installed in a system for connecting to the internet. This is important for wireless, wired and LAN communication. It has a unique MAC address that will help in identifying the computer within a network.

70

What is SMTP?

Reference answer

SMTP stands for Simple Mail Transfer Protocol. This protocol is used for delivering emails over a network from one system to another. It is a part of the TCP/IP application layer protocol that uses a method called “store and forward”. This is used for sending emails across the networks with the help of a Mail Transfer Agent. SMPTP can send messages to one or more clients within or outside the network. These messages can include text, voice, images or graphics.

71

Can you state the differences between a switch, router, and a hub?

Reference answer

A switch is used for forwarding the data packets in a network. It facilitates error checking for the data packets and send error-free packets to the destined ports properly. A router is a networking device that transfers data packets after analyzing their contents. The correct destination, correctness and IP address of the data packets are checked by the router. They make use of a routing table for finding out the best path for transmission. A hub is a connection point for networking devices. Different segments of a LAN are connected using a LAN. It also has several ports for communication. If a packet arrives at a hub port, it is copied to the other ports so that it is visible to the other segments of the LAN. But as they are unable to filter data, it sends the data packets to all the connected devices.

72

Explain subnetting and CIDR notation with an example.

Reference answer

Subnetting means dividing a network into smaller parts. The subnet mask help in the division where it tells which part of an IP address is the network and which part is for hosts. CIDR notation is just a shorter way to represent this. For example, /24 means the first 24 bits are for the network, and the remaining 8 bits are for hosts. You can understand this with the help of an example: 192.168.1.0/24 Here: Total addresses = 256 Usable hosts = 254 But why not 256? It is because .0 is the network address and .255 broadcast address So actual usable IPs are: 192.168.1.1 to 192.168.1.254 Now if you split this /24 into two smaller networks: You increase the network bits - /25 192.168.1.0/25 192.168.1.128/25 This will give you two subnets: First: .0 to .127 Second: .128 to .255 Now when this happens, each subnet gets fewer hosts and the segmentation gets better. Now here are some quick info you need to keep in mind about subnetting - It reduces unnecessary broadcast traffic - improves security, i.e, isolation between networks - uses IP addresses more efficiently Some common CIDR values that you should remember are: /8 - 255.0.0.0 /16 - 255.255.0.0 /24 - 255.255.255.0 /32 - single host

73

Define the term OFDM.

Reference answer

OFDM stands for Orthogonal Frequency Division Multiplexing, which is also a multiplexing technique used in analog systems. In OFDM, a guard band is not necessary, and the spectral efficiency of OFDM is high, which negates FDM. Additionally, an individual data source connects all the sub-channels in it.

74

Explain the OSI Model and Its Functions

Reference answer

The OSI (Open Systems Interconnection) model is a network communication framework divided into seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application. Each layer provides specific services to enable communication between systems.

75

When 2 laptops wirelessly connected can communicate directly, what type of topology is created?

Reference answer

Full Mesh Topology (Ad-hoc Network): Each node is directly connected to all other nodes.

76

What is the weakness of star geography?

Reference answer

One significant weakness of star geography is that once the focal Hub or switch gets harmed, the whole network gets unusable.

77

What four protocols are managed by the Network Layer?

Reference answer

Four protocols are managed by this layer: ICMP, IGMP, IP, and ARP.

78

What is an SSID and why is it important?

Reference answer

SSID (Service Set Identifier) is the unique name assigned to a Wi-Fi network, distinguishing it from other networks in the area. It enables users to identify and connect to the correct network, ensuring secure and organized access. Properly naming SSIDs helps manage multiple networks, prevents unauthorized access, and can be used to communicate network information, such as usage policies or ownership.

79

What is a wireless access point (AP) and what does it do?

Reference answer

A wireless access point (AP) extends the wireless coverage of an existing network, allowing devices to connect to the network wirelessly and facilitating communication between different devices on the same network.

80

How are Network types classified?

Reference answer

Network types can be classified and divided based on the area of distribution of the network. The below diagram would help to understand the same:

81

How do we prevent loops on the WLC?

Reference answer

STP (Spanning Tree Protocol): Enabled to prevent network loops.

82

Explain the difference between TCP and UDP, and when you would use each.

Reference answer

TCP (Transmission Control Protocol) is a connection-oriented protocol, meaning it establishes a connection before transmitting data and guarantees reliable, ordered delivery of data. It uses a three-way handshake to establish a connection and includes error checking and retransmission mechanisms. UDP (User Datagram Protocol), on the other hand, is a connectionless protocol. It doesn't establish a connection and doesn't guarantee reliable or ordered delivery. Data is sent as individual packets without any error recovery. Use TCP when reliability is crucial, such as for web browsing (HTTP/HTTPS), email (SMTP, POP3, IMAP), and file transfer (FTP). Use UDP when speed and low latency are more important than reliability, such as for online gaming, video streaming, and DNS lookups. For example, a real-time game might tolerate some packet loss for faster updates, while a file transfer needs every bit to arrive correctly.

83

What kind of arithmetic is used to add data items in checksum calculation?

Reference answer

To add data items in checksum calculations, one's complement arithmetic is used.

84

What is the use of a router and how is it different from a gateway?

Reference answer

The router is a networking device used for connecting two or more network segments. It directs the traffic in the network. It transfers information and data like web pages, emails, images, videos, etc. from source to destination in the form of packets. It operates at the network layer. The gateways are also used to route and regulate the network traffic but, they can also send data between two dissimilar networks while a router can only send data to similar networks.

85

What is a Wi-Fi 6 network?

Reference answer

Wi-Fi 6 (802.11ax) is the latest generation of Wi-Fi, offering higher speeds, improved efficiency, better support for multiple devices, and enhanced security features.

86

Tell me something about VPN (Virtual Private Network)

Reference answer

VPN or the Virtual Private Network is a private WAN (Wide Area Network) built on the internet. It allows the creation of a secured tunnel (protected network) between different networks using the internet (public network). By using the VPN, a client can connect to the organization's network remotely. The below diagram shows an organizational WAN network over Australia created using VPN:

87

What is load balancing and what is its role in network performance and availability?

Reference answer

Load balancing distributes network traffic across multiple servers to prevent any single server from becoming overloaded. This is crucial for improving both performance and availability. By distributing the workload, load balancing ensures that users experience faster response times and reduced latency, as requests are handled by servers with available resources. Its role is vital for high availability. If one server fails, the load balancer automatically redirects traffic to the remaining healthy servers, minimizing downtime and ensuring continuous service availability. This also allows for easier scaling, as new servers can be added to the pool without disrupting service. Common algorithms are round robin, least connections, and IP hash.

88

Define the concept of CORESET in the context of 5G.

Reference answer

Control Resource Sets (CORESET) play a crucial role in the control signalling within 5G networks. CORESET is a set of resources dedicated to control signalling, ensuring efficient and reliable communication between the network and user devices. It allows for the prioritisation of critical control information, contributing to the overall efficiency of the 5G network.

89

What is the difference between circuit switching and packet switching?

Reference answer

Sure, let's start with circuit switching. This is an older technology mostly used for telephone communications. In circuit switching, a dedicated physical path is established between the sender and receiver before they can communicate. This path, or 'circuit,' remains open for the duration of the communication, guaranteeing a constant data rate and delay. However, the circuit can't be used by other callers until the call is finished, which can be inefficient. Now, packet switching, which is used in most modern networks, including the internet, operates quite differently. Instead of establishing a dedicated path, data is broken down into small chunks called 'packets'. Each of these packets contains metadata on where it came from and where it's going. The packets get sent over the network by the best available route, which may not be the same for all packets. Once they all arrive, the data is reassembled in the correct order. This technique allows for better use of network resources by allowing multiple users to send and receive packets over the same lines. So the main difference is that circuit switching establishes a direct, dedicated path for communication, while packet switching divides data into packets and sends them over the network independently. Packet switching is generally seen as the more efficient of the two, ideal for today's high-speed, high-traffic networks.

90

What are the main issues in wireless networks?

Reference answer

The main issues are: - Coverage: Access points must be placed to ensure proper signal strength; different materials affect signals. - Interference: Devices on 2.4 and 5 GHz frequencies can weaken signal quality. - Privacy: Data is transmitted through the air, requiring strong authentication and encryption. - Regulations: Wireless spectrum use is restricted; the ISM band (902-928 MHz, 2.4-2.4835 GHz, 5 GHz) is license-free but prone to interference.

91

Explain the Difference Between LAN, MAN, and WAN.

Reference answer

- LAN (Local Area Network): Provides low latency and high speed (up to 1 Gbps or more) within a constrained space, such as an office. - MAN (Metropolitan Area Network): Covers larger areas such as university campuses or cities. Examples: Metro Ethernet. - WAN (Wide Area Network): Spans across countries or continents using service providers. Examples: MPLS, SD-WAN.

92

Explain what a proxy server is

Reference answer

Many prominent enterprises and institutions leverage proxy servers to optimise network performance and security in today's technology-driven landscape. So, if you're applying for network engineer jobs at major organisations, this question is more likely to come up during the interview. Therefore, it would be wise to consider how you would respond to this question as part of your network engineer interview preparation. Below is how we'd recommend responding to this more technical question. "A proxy server takes on the responsibility of accessing and retrieving data on behalf of users, much like how a DNS server caches website addresses. Additionally, it keeps a record of websites, distinguishing between those that are whitelisted or banned, thereby shielding users from easily avoidable viruses."

93

What do you mean by a network?

Reference answer

A network can be considered as a set of devices of systems that are connected. They can communicate and share information. Devices such as computers, laptops, servers, and printers can be connected through networks like LAN (Local Area Network) and WAN (Wide Area Network).

94

How does Wi-Fi work?

Reference answer

Wi-Fi allows devices to connect to a network wirelessly using radio waves. It's essentially like a walkie-talkie, but for data. A Wi-Fi router acts as a base station, transmitting and receiving data. Your devices (laptops, phones, etc.) have Wi-Fi adapters that can send and receive these radio waves, allowing them to communicate with the router and, subsequently, the internet. Data is encoded onto these radio waves using specific protocols (like 802.11a/b/g/n/ac/ax) and frequencies. When your device wants to send data, it converts it into radio waves and transmits them. The router receives these waves, decodes the data, and forwards it to the internet (or another device on the network). The reverse process happens when the router receives data from the internet and transmits it to your device.

95

Briefly depict NAT

Reference answer

NAT is Network Address Translation. This is a convention that gives a route to various PCs on a typical network to share a solitary association with the Internet.

96

Explain the concept of signal strength and its impact on wireless network performance.

Reference answer

Signal strength refers to the intensity of the RF signal emitted by a WAP. Weaker signals can lead to slower data speeds, dropped connections, and unreliable performance. Strong signal strength is essential for optimal wireless network performance.

97

Why is WPA encryption preferred over WEP?

Reference answer

Stronger Encryption: WPA provides better security and dynamic key changes, unlike WEP which uses static keys.

98

What is OSPF (Open Shortest Path First)?

Reference answer

A link-state routing protocol using Dijkstra's algorithm to calculate the shortest path. - Divides areas (Backbone area 0). - Supports authentication and load balancing.

99

How do you integrate scripts with network monitoring tools?

Reference answer

The integration of scripts with network monitoring tools requires using APIs or custom scripts to extend functionality. For example, network engineers could use Python or Bash scripts to collect specific metrics and feed them into tools like Nagios or PRTG. This integration enhances monitoring capabilities, automates responses to alerts, and provides detailed insights into network performance.

100

How do you configure a guest network using a Cisco wireless controller?

Reference answer

To configure a guest network: - - Create a new WLAN for guest access on the controller. - Configure SSID, security settings, and VLAN assignment for the guest network. - Set up a captive portal for guest authentication. - Apply QoS and bandwidth policies to manage guest traffic.

101

What is the difference between a stateful firewall and a stateless firewall?

Reference answer

A stateful firewall monitors the state of active connections and makes decisions based on the context of traffic. This ensures a more dynamic and intelligent filtering process. A stateless firewall, on the other hand, filters packets based solely on predefined rules, without considering the state of the connection. It is faster but less sophisticated.

102

Explain the importance of network segmentation and methods to implement it.

Reference answer

Network segmentation divides a large network into smaller, logically independent subnets to enhance security, manageability, and performance. It can be implemented using VLANs, firewall rules, and Access Control Lists (ACLs).

103

How long have you worked as a network engineer?

Reference answer

Of course, these types of network interview questions answer themselves, but it also allows you to talk through your journey. Some interviewers will be looking for a certain level of experience, potentially 5-10 years, for more senior network engineer jobs. An interviewer may look for relevant work experience for entry-level network engineer jobs, such as an IT support role or other qualifications. However, this should all be specified in the network engineer job description you applied for.

104

What are project management interview questions for career switchers and mid-level candidates?

Reference answer

Project management interview questions for career switchers and mid-level candidates, with answer frameworks, role-switch translation, and hiring-manager cues.

105

What is an IP Address?

Reference answer

An IP address uniquely identifies devices within a network. - IPv4 (32-bit): 4 octets (e.g., 192.168.1.1), providing ~4.3 billion addresses. - IPv6 (128-bit): Written in hexadecimal (e.g., 2001:db8::1), offering 3.4×1038 unique addresses — critical for IoT and modern enterprises.

106

What happens when you type a website address into your browser?

Reference answer

Your browser starts by looking up the website's real address. The name you type is not the actual location. DNS servers translate this name into a numerical IP address. Next, your browser creates a connection to that server. It utilizes the TCP protocol to establish a secure pathway for data transfer. This happens through a three-way handshake process. Your browser then requests the webpage. It sends an HTTP message requesting specific content from the server. This message includes details about what your browser can handle. The server handles this request, and it responds by transmitting the webpage files. The latter consists of HTML, CSS, JavaScript code, and graphics. The files flow back to your device via the internet. Your browser receives all of these components. It reads the code, applies the styling, and executes the scripts, displaying all on your screen as one whole web page.

107

What is the role of address in a packet traveling through a datagram network?

Reference answer

The address field in a datagram network is end-to-end addressing.

108

Describe your experience with different network topologies and their trade-offs.

Reference answer

I have experience with several network topologies, including bus, star, ring, mesh, and tree topologies. The bus topology is simple and inexpensive to implement, but it suffers from performance issues as network traffic increases and is vulnerable to a single point of failure (the bus cable). The star topology, where all devices connect to a central hub or switch, is more robust and easier to troubleshoot, but it relies on the central device. A ring topology connects devices in a closed loop; data travels in one direction, and while it can offer good performance under heavy loads, a single point of failure (a broken connection) can disrupt the entire network. A mesh topology provides high redundancy and fault tolerance because devices are interconnected with multiple paths, but it's also the most expensive and complex to implement. Finally, a tree topology combines characteristics of bus and star topologies, offering scalability and hierarchical management, but its performance depends on the central 'root' node. Each topology has its own set of advantages and disadvantages, and the selection of the appropriate topology depends on factors such as network size, budget, performance requirements, and fault tolerance needs. For instance, a small office might use a star topology due to its simplicity and cost-effectiveness, while a large enterprise might employ a mesh or tree topology for redundancy and scalability. I've been involved in projects where the choice of topology was driven by specific application requirements and business constraints, carefully weighing the trade-offs between cost, performance, and reliability.

109

Explain in as much detail as possible when you try and ping a server on the internet

Reference answer

Assuming the ping involves a packet being sent over an Ethernet or WiFi network, ARP is used to find the Ethernet hardware address of the device that receives the outbound packet. Typically this will be the router for the LAN the machine originating the ping is on. The typical process is: - You enter a command to ping a destination. - DNS is used to determine the IP address (if needed). - The routing table is consulted to find the next hop towards that destination. - ARP is used to find the hardware address of the next hop. - The IP packet is sent to the next hop, encapsulated in an Ethernet or WiFi frame

110

What is two-factor authentication (2FA) and how does it enhance security?

Reference answer

Two-factor authentication (2FA) is a security process that requires users to provide two different types of identification before accessing an account or system. It typically involves something the user knows (like a password) and something the user has (like a smartphone for a verification code). 2FA enhances security by adding a layer of verification, making it more difficult for unauthorized users to gain access.

111

What is the standard shading arrangement of a straight-through link?

Reference answer

Orange or white, orange, green or white, blue, blue or white, green, earthy coloured or white, earthy coloured.

112

What are the different types of VPN?

Reference answer

Few types of VPN are: - Access VPN: Access VPN is used to provide connectivity to remote mobile users and telecommuters. It serves as an alternative to dial-up connections or ISDN (Integrated Services Digital Network) connections. It is a low-cost solution and provides a wide range of connectivity. - Site-to-Site VPN: A Site-to-Site or Router-to-Router VPN is commonly used in large companies having branches in different locations to connect the network of one office to another in different locations. There are 2 sub-categories as mentioned below: - Intranet VPN: Intranet VPN is useful for connecting remote offices in different geographical locations using shared infrastructure (internet connectivity and servers) with the same accessibility policies as a private WAN (wide area network). - Extranet VPN: Extranet VPN uses shared infrastructure over an intranet, suppliers, customers, partners, and other entities and connects them using dedicated connections.

113

What is multicast steering?

Reference answer

Multicast steering is focused on the type of broadcasting that makes an impression on a chose gathering of the client as opposed to sending it to all clients on a subnet.

114

Suppose you configure a static route, but traffic still isn't reaching the destination. What could be the reason?

Reference answer

Some of the reasons for this issue can be: - Next-hop IP might be wrong - The return route might be wrong - Interface down - The subnet mask might be wrong - Routing loops - The firewall may be blocking the traffic You can verify using these commands: "show ip route ping traceroute" You should also make sure that the destination device has a route back to the source network.

115

What is data encapsulation in networking?

Reference answer

Data encapsulation is a process in which data is packaged and labelled for accurate and efficient transmission over a network. It's a key part of the layered network architecture models, such as the TCP/IP or OSI models. Here's a high-level view of what happens during data encapsulation: At the highest layer (like the Application layer in the OSI model), data is generated from a user application, like an email or a web page request. As the data descends each layer of the model, it gets wrapped or 'encapsulated' in protocol information for that layer. Each layer provides specific services, and the protocol data added to the original payload can include addresses, control information, error checking fields, sequence numbers, and more. For instance, at the Transport Layer, segments with additional headers for transport specific features (like sequence number for reassembling packets in the correct order) are created. At the Network Layer, these segments are packed into packets with IP headers that include source and destination IP addresses. Finally, at the Data Link Layer, these packets are encapsulated into frames, with headers and footers for network interface operations, like MAC addresses and error checking fields. These frames are then sent over the physical network (like Ethernet or Wi-Fi). At the receiving end, this process is reversed, in a procedure known as de-encapsulation. The protocol-specific headers and footers added at each layer get stripped off at the corresponding layer, eventually restoring the original data at the top layer. This process ensures efficient and orderly transmission and receiving of data over the network.

116

What are Key Differences Between Hub, Switch, and Router?

Reference answer

| Device | Layer | Function | |---|---|---| | Hub | Layer 1 | Broadcasts all data | | Switch | Layer 2 | Forwards frames via MAC | | Router | Layer 3 | Routes packets via IP |

117

What is the difference between IPv4 and IPv6?

Reference answer

IPv4 is the fourth version of the Internet Protocol, using 32-bit addresses which allows for 4.3 billion unique addresses. IPv6 is the sixth version, using 128-bit addresses, greatly increasing the number of possible unique addresses to accommodate the growing number of internet-connected devices.

118

When two laptops are directly connected wirelessly, what type of topology has been created?

Reference answer

An ad-hoc topology, also known as IBSS (Independent Basic Service Set), has been created.

119

What is Defense in Depth?

Reference answer

Defense in Depth involves using multiple layers of security mechanisms to protect against various threats. This includes firewalls, intrusion detection systems, encryption, access controls, and regular audits, creating a robust defense strategy to counter diverse cyber threats.

120

Which sequence of flags is used to properly terminate a TCP connection?

Reference answer

FIN, ACK

121

Why did you choose to become a network engineer?

Reference answer

This next question lets you show off your passion and enthusiasm for the network engineering job youâ€™re interviewing for. An interviewer will be looking to see what motivated you to become a network engineer and how eager you are to progress in your network engineering career. When looking at how to prepare for network interview questions like this, hereâ€™s an excellent example of a response: â€œSince I can remember, Iâ€™ve always had a love for computers and tech in general. My passion continued into my early adulthood when I attended university to earn a computer science degree before jumping into network engineering. Since I began my career as a network engineer, Iâ€™ve been driven to help solve complex issues and scale networks for innovative businesses.â€

122

What is DoS?

Reference answer

DoS or Denial-of-Service assault is an endeavor to keep clients from having the option to get to the Internet or some other network administrations. Such assaults may come in various structures and are finished by a gathering of culprits. One basic technique for doing this is to over-burden the framework worker so it can't handle any longer interaction genuine traffic and will be compelled to reset.

123

What is Syslog?

Reference answer

Syslog standardizes message logging for routers, switches, and firewalls. It helps in troubleshooting and centralized monitoring.

124

What is the purpose of a proxy server?

Reference answer

Proxy servers primarily prevent external users from identifying the IP addresses of an internal network. Without knowledge of the correct IP address, the physical location of the network cannot be determined. This makes network locations more secure.

125

How would you secure a wireless network?

Reference answer

To secure a wireless network, I would use strong encryption methods like WPA2 or WPA3, set a robust password, disable SSID broadcasting, enable MAC address filtering, and regularly update the firmware of network devices.

126

Can you describe a scenario where you used scripting to solve a network problem?

Reference answer

Here, candidates might describe scenarios such as: Writing a Python script to automatically allocate IP addresses; Creating a script to parse and analyze network logs, identify patterns, and highlight errors; Using a script to periodically ping devices and measure latency, packet loss, and jitter; Developing a script to automate the backup and deployment of network device configurations. Look for answers including detailed information about the problem, the scripting language candidates used, the specific functions of the script, and the outcome they achieved.

127

How To Find Your Port Number ?

Reference answer

We can find port number using command line Tool, and using resource monitor. By utilizing the tools like ‘Netstat' we can troubleshoot and monitor our system and network, and also gain the insights into network security, and identify any processes using specific ports. It will help us in managing and securing our system efficiently.

128

What is Confidentiality, Integrity & Availability?

Reference answer

The CIA triad can be broadly defined as: Confidentiality – means information is not disclosed to unauthorized individuals, entities, or processes. For example, if we say I have a password for my Gmail account but someone saw it while I was doing login into my Gmail account. In that case, my password has been compromised and Confidentiality has been breached. Integrity – means maintaining the accuracy and completeness of data. This means data cannot be edited in an unauthorized way. For example, if an employee leaves an organization then in that case data for that employee in all departments like accounts, should be updated to reflect the status to JOB LEFT so that data is complete and accurate in addition, this is only authorized persons should be allowed to edit employee data. Availability – means information must be available when needed. For example, if one needs to access information about a particular employee to check whether an employee has outstood the number of leaves, that case, it requires collaboration from different organizational teams like network operations, development operations, incident response, and policy/change management. Denial of service attack is one of the factors that can hamper the availability of information.

129

How much overhead is added for WEP, TKIP and CCMP?

Reference answer

WEP : 8 Octet [4-IV + 4-ICV] TKIP : 20 Octet [4-IV + 4-EIV + 8-MIC + 4-ICV] CCMP : 16 Octet [8-CCMP Header + 8-MIC]

130

What is TTL in networking?

Reference answer

The TTL, or Time to Live, is a field in the IP packet that signifies how many more hops a packet can make before it should be discarded or returned. Each time a packet passes through a router, the TTL value decreases by one. So, if a router receives a packet where the TTL equals 0, the router is forced to drop the packet and not forward it onto another host. When this happens, the router returns an ICMP message, known as "Time Exceeded," back to the originator of the packet. This TTL mechanism prevents packets from looping around the network indefinitely in case of a routing loop, a malconfiguration or a routing table error. It also provides a way to trace the path a packet takes by allowing network admins to receive a response from each router a packet passes through.

131

What is an IP address?

Reference answer

An IP address labels networked devices, aiding their identification and communication across networks. It's crucial for internet communication, structured as decimal numbers separated by periods (e.g., 192.168.0.1 for IPv4). IP addresses enable efficient routing and data delivery. IPv6 expands address space to accommodate more devices. They're vital for host addressing, routing, and seamless communication in IP-based networks.

132

If an employee complains that the voice calls over the IP Phones are very choppy. How will you fix it?

Reference answer

You should first check the configuration of Quality of Service (QoS) because voice traffic is very sensitive to delay, jitter, and packet loss. To fix this, you should first check QoS policies and bandwidth utilization. Next, you should: - Give priority to VoIP traffic - Inspect WAN Congestion - And verify duplex/speed settings You should also test the network's latency and packet drops.

133

What is the role of SSL certificates in web security?

Reference answer

SSL certificates create secure, encrypted connections between browsers and servers, ensuring data confidentiality. They also verify website legitimacy and prevent man-in-the-middle attacks. Regular updates are essential for maintaining strong web security.

134

How do you secure a wireless network?

Reference answer

Key points for securing a wireless network are as follows:- a) Verify that your PC's software firewall is turned on, and that Window's file-sharing feature is off; it's off by default in Window's XP with Service Pack 2. b) Never send bank passwords, credit card numbers, confidential e-mail, or other sensitive data unless you're sure you're on secure site: Look for the lock icon in the bottom-right corner of your browser, as well as a URL in the address bar that begins with https. Such sites build in their own encryption. c) Always turn your Wi-Fi radio off when you're not at a hotspot: Hackers can use it to create peer-to-peer Wi-Fi connections with your computer and access it directly. d) For better security, consider signing up for a paid subscription to a hotspot network such as Boingo or T-Mobile. Both companies provide connection software that encrypts your sessions automatically. By attaining these key points you can secure wireless network up to an extent.

135

What is 802.1x?

Reference answer

802.1x: IEEE standard for port-based network access control, providing an authentication framework for wireless LANs. It authenticates devices wishing to attach to a LAN or WLAN through a central authority.

136

What is a Network Intrusion Detection System (NIDS)?

Reference answer

NIDS monitors network traffic for suspicious activities or patterns that could indicate a cyber attack. By analyzing network packets and comparing them to known signatures or behaviors, NIDS detects unauthorized access or potential threats, enabling timely interventions.

137

What is DMZ (Demilitarized Zone)?

Reference answer

A DMZ isolates public-facing services (like web or mail servers) from the internal network, adding an extra layer of protection.

138

What data rates are beacons sent out / broadcasted?

Reference answer

Beacons are broadcasted at the mandatory data rates set on the 2.4 and 5GHz radios.

139

What happens in the OSI model when a data packet moves from the upper to lower layers?

Reference answer

As a data packet traverses the OSI model layers during data Decapsulation, it undergoes successive transformations. Here's how: a) Beginning from the upper layers (7-5), it sheds application-specific headers, progressing downwards. b) At the Transport Layer (4), port numbers and checksums are removed. c) The Network Layer (3) discards IP addresses and routing details. d) While the Data Link Layer (2) sheds frame encapsulation. e) Finally, at the Physical Layer (1), the packet transforms into pure data for transmission.

140

How would you troubleshoot one way audio issue

Reference answer

Typically one way audio issues stem from power mismatch between the AP and the VoWiFi device. The VoWiFI device has limited transmit power compared to the AP which can cause one way audio issues. The VoWiFi device can hear the AP communication even at relatively far off distances but at cell edge or beyond if the VoWiFi transmits data back, the AP sometimes cannot interpret the data leading to one way audio. This is the simplest form of one way audio issue. You need to determine if the communication is between 2 VoWiFi devices or one VoWiFi and one wired phone. There could be configurations that may block peer to peer communication which may potentially lead to one way audio or no audio between two VoWiFi devices. The way to troubleshoot such issue is normally double check the configurations are ok and adhere voice of wifi best practices and then delve into debugs + over the air captures for further isolating the problem.

141

How would you verify a network design based on engineering requests?

Reference answer

I would review the engineering request against existing network documentation, validate IP addressing and VLAN assignments, check for redundancy (e.g., spanning tree, link aggregation), and simulate the design in a lab environment if possible. I would also ensure compliance with security policies and provide feedback on potential bottlenecks or scalability issues.

142

What is the primary benefit of using VLANs (Virtual LANs) in a network?

Reference answer

Improved security and performance

143

How would you troubleshoot a wireless network connection issue?

Reference answer

To troubleshoot a wireless network connection issue, I would check the device's network settings, ensure the router is functioning properly, verify there are no physical obstructions or interference sources, and if necessary, reset the router or network adapter.

144

What is Risk Assessment?

Reference answer

Risk Assessment identifies potential security risks and vulnerabilities, assesses their impact, prioritizes them based on severity and likelihood, and guides the implementation of effective mitigation strategies. It is an ongoing process to adapt to evolving threats.

145

What are the types of 802.11 frames?

Reference answer

Management, Control, Data frame and reserved

146

What is Honeypot Technology?

Reference answer

Honeypot technology is an active defense technique that sets up decoy targets to attract attackers, thereby monitoring and analyzing their behaviors. Types include low-interaction and high-interaction honeypots.

147

Explain the difference between wired and wireless networking.

Reference answer

Wired networking uses physical cables, such as Ethernet cables, to transmit data, while wireless networking uses radio waves. Wired networks offer higher bandwidth, better security, and lower latency, but are less flexible and mobile. Wireless networks provide flexibility, mobility, and ease of installation but have lower bandwidth, potential security vulnerabilities, and can be prone to interference.

148

Explain the concept of multiplexing in wireless communication.

Reference answer

Multiplexing combines multiple signals into one transmission medium. Types include Frequency Division Multiplexing (FDM), Time Division Multiplexing (TDM), and Wavelength Division Multiplexing (WDM), enabling efficient use of bandwidth and simultaneous communication.

149

Which encryption type does WPA2 use?

Reference answer

WPA2 uses AES: A newer Wi-Fi encryption solution that is more secure than the older TKIP used in WPA.

150

What steps would you take to maintain code and configuration of lab equipment based on a production environment?

Reference answer

I would establish a baseline configuration template aligned with production standards, use version control (e.g., Git or TFTP backups) for all configs, schedule regular firmware/OS upgrades following change management procedures, and test changes in the lab before production deployment. I would also document any deviations from production for testing purposes.

151

What is the difference between ad-hoc and infrastructure mode in IEEE 802.11?

Reference answer

In ad-hoc mode, WLAN mobile and stationary terminals, referred to as STAs (stations), communicate directly. In the infrastructure mode, STAs communicate via an entity called an AP (Access Point). It is similar to mesh and star topologies used in other wireless networks. Infrastructure mode is used to connect with a wired network.

152

Explain the difference between 2.4 GHz and 5 GHz Wi-Fi bands.

Reference answer

- 2.4 GHz: Offers wider range but is more prone to interference, with lower speeds. - 5 GHz: Provides faster speeds but has shorter range and is more susceptible to obstacles.

153

Define the term Jitter?

Reference answer

Jitter is a “packet delay variance”. It can simply mean that jitter is considered a problem when different packets of data face different delays in a network and the data at the receiver application is time-sensitive, i.e. audio or video data. Jitter is measured in milliseconds(ms). It is defined as an interference in the normal order of sending data packets.

154

What is the difference between the ipconfig and ifconfig?

Reference answer

ipconfig stands for Internet Protocol Configuration, whereas ifconfig stands for Interface Configuration. The two have similar functions, except that the ipconfig command is used with the Windows operating system, while the ifconfig command is used on Linux and Mac computers. Both commands display network information. They display your IP address, network mask, and gateway information. However, `ifconfig` is not limited to displaying information. `ifconfig` allows you to modify network settings directly. You can enable or disable network interfaces. You can also assign new IP addresses through this command. `ipconfig` is more limited in what it can do. It mainly shows network details. Its main extra feature is refreshing your network connection. Many Linux users now prefer the newer `ip` command. It has replaced `ifconfig` in some newer distributions. But `ifconfig` is still commonly used and understood.

155

How do you troubleshoot a wireless network issue where devices are unable to connect?

Reference answer

To troubleshoot wireless connectivity issues: - - Check the SSID and password for correctness. - Verify that the access point is powered on and operational. - Ensure there is no interference from other devices or physical obstructions. - Check for IP address conflicts and DHCP settings. - Review the access point's configuration and firmware for updates.

156

Define the term OFDM?

Reference answer

Orthogonal Frequency Division Multiplexing (OFDM): It is also the multiplexing technique that is used in an analog system. In OFDM, the Guard band is not required and the spectral efficiency of OFDM is high which oppose to the FDM. In OFDM, a Single data source attaches all the sub-channels.

157

What is the difference between a hotspot and a WAP?

Reference answer

- WAP: A device that connects wireless devices to a network, regardless of whether it's public or private. - Hotspot: A public WAP that provides internet access to users in a specific location.

158

Suppose some users can access the Internet but cannot access the company server. What should you troubleshoot first?

Reference answer

First, check whether the server is reachable on the local network. You can use commands like "ping" or "traceroute" to check this. If the user can access the Internet but not the internal server, the issue must be related to: - Incorrect VLAN configuration - Firewall rules are blocking access - DNS resolution issue - Server down or disconnected - Incorrect gateway settings You should also verify: - IP configuration of the client - Server status - Switch port VLAN assignment - ACLs or firewall policies

159

What is the meaning of threat, vulnerability, and risk?

Reference answer

Threats are anything that can exploit a vulnerability accidentally or intentionally and destroy or damage an asset. An asset can be anything people, property, or information. The asset is what we are trying to protect and a threat is what we are trying to protect against. Vulnerability means a gap or weakness in our protection efforts. Risk is nothing but an intersection of assets, threats, and vulnerability. A+T+V = R

160

Describe the OSPF Protocol and Its Features.

Reference answer

OSPF (Open Shortest Path First) is a link-state interior gateway protocol that finds optimal routing paths within an Autonomous System (AS). It maintains a link-state database, broadcasts updates using flooding, and uses the shortest path algorithm. Key features include fast convergence, scalability, and CIDR support.

161

Describe your experience implementing and managing network monitoring systems to proactively identify and resolve issues.

Reference answer

I have experience implementing and managing network monitoring systems using tools like Nagios, Zabbix, and Prometheus. My approach involves setting up comprehensive monitoring for key network devices (routers, switches, firewalls) and services (DNS, DHCP, web servers). This includes tracking metrics like CPU utilization, memory usage, bandwidth utilization, latency, and packet loss. Alert thresholds are configured based on established baselines to trigger notifications when anomalies occur. To proactively identify and resolve issues, I use the monitoring system to visualize trends and identify potential bottlenecks. For example, if bandwidth utilization on a specific link consistently exceeds a certain threshold during peak hours, I can investigate capacity upgrades or traffic shaping strategies. Similarly, unusual latency spikes might indicate a routing problem or a network device failure. I also configure automated remediation tasks where possible, such as restarting a service or running diagnostic scripts when specific alerts are triggered. The data collected is used to generate reports, providing insights into network performance and informing future network optimization efforts.

162

What are profiles in networking?

Reference answer

Profiles are the configuration settings created for each user. A profile could be created that places a user in a group, for example.

163

What are the different types of network topologies?

Reference answer

Network topology refers to how devices, also known as nodes, within a network are arranged and how they connect to each other. There are several main types of network topologies: Star Topology: In this setup, all devices connect to a central hub or concentrator. This is one of the most common arrangements because if a single connection fails, it doesn't affect the rest of the network. Bus Topology: In a bus topology, all devices connect to a single, central cable known as the 'bus'. While this topology is simple and inexpensive, if the main cable encounters a problem, the entire network can be affected. Ring Topology: As the name suggests, this topology arranges devices in a circular pathway. Each device connects to two others, forming a ring. Information travels around this ring in one direction. This topology can handle high volumes of traffic, but if one connection fails, it can impact the whole network. Mesh Topology: In this arrangement, devices are interconnected, with many redundant interconnections. This redundancy means that if one connection fails, there are multiple paths to ensure data can reach its destination. Hybrid Topology: This type combines two or more different topologies into one network. For example, a star-bus network topology combines multiple star topologies on a single bus. These are just a few examples, and the choice of topology depends on factors such as the specific requirements of the network, cost, and ease of maintenance.

164

Name the three means of user authentication.

Reference answer

There is biometrics (e.g. a thumbprint, iris scan), a token, or a password. There is also two-level authentication, which employs two of those methods.

165

What is the difference between a wireless network and a satellite network?

Reference answer

- Wireless network: Uses radio waves for short-range connections. - Satellite network: Uses satellites orbiting Earth to provide long-range connections across vast distances.

166

Explain the measures taken to ensure network optimisation during 5G deployment.

Reference answer

Optimising the Network during deployment is essential for delivering a superior user experience. Network optimisation during 5G deployment involves fine-tuning parameters, optimising coverage, and adjusting interference levels. Continuous monitoring, performance analysis, and proactive troubleshooting contribute to maintaining optimal network conditions for end-users.

167

What is subnetting and why is it important?

Reference answer

Subnetting is the process of dividing a single IP network into multiple smaller, logical sub-networks or subnets. This is achieved by borrowing bits from the host portion of an IP address and using them as network bits, creating a new subnet mask. Subnetting allows for better network organization and management. It's important because it: - Reduces network congestion by containing broadcast traffic within each subnet - Enhances security by isolating network segments - Simplifies network management and troubleshooting - Improves IP address utilization efficiency

168

What is a Server Farm?

Reference answer

A Server Farm epitomises a centralised aggregation of multiple servers or computing resources clustered together within a data centre environment. It helps furnish scalable, high-performance computing capabilities. Serving as the backbone of modern data centre architectures, Server Farms consolidate and centrally manage computing resources. They enable organisations to meet escalating demands and ensure optimal service delivery.

169

What are three basic parameters to configure on a wireless access point?

Reference answer

Three basic parameters are SSID (network name), security settings (e.g., encryption type), and channel selection.

170

What is the 802.11g standard?

Reference answer

Launched in 2003, 802.11g combines the best of both 802.11a and 802.11b. It operates in the 2.4 GHz frequency band and uses OFDM, offering a maximum data rate of 54 Mbps. It is backward compatible with 802.11b devices.

171

The network becomes very slow during office hours. How would you identify the problem?

Reference answer

You should first check these things: - Bandwidth utilization - Broadcast storms - Duplex mismatch - High CPU usage on network devices - Excessive downloads or streaming - Malware or abnormal traffic You can use tools such as: - Wireshark - SNMP monitoring - NetFlow - Interface statistics on switches/routers You should also check: " show interfaces show processes cpu"

172

What are the three main factors affecting wireless networks?

Reference answer

The three main factors are: - Reflection: Signals bounce off materials like metal, making it hard to penetrate surfaces such as metal ceilings or elevators. - Scattering: Signals hit a surface and break apart, weakening the original signal. - Absorption: Materials like water and the human body absorb signals, significantly reducing signal strength.

173

What is SDN (Software-Defined Networking)?

Reference answer

SDN separates the control plane from the data forwarding plane, centralizing control and enabling programmability. This architecture allows administrators to manage and optimize network resources flexibly and efficiently.

174

Can you differentiate between the internet, intranet, and extranet?

Reference answer

The internet is a global network that connects thousands of computers. Information can be accessed and shared from any location that has access to the internet. An intranet is a network that is unique to a firm where data is accessed and shared among the computers within that network only. An extranet is a network where only specific members are allowed access. These may include vendors, customers, suppliers, and other officials who are associated with a company. The extranet handles the secure part of the website that is accessed through IDs and passwords.

175

What can be considered great passwords?

Reference answer

Great passwords are comprised of letters, yet by consolidating letters and numbers. A secret key that consolidates capitalized and lowercase letters are positive than one that utilizes all capitalized or all lowercase letters. Passwords should be no words that can without much of a stretch be speculated by programmers, like dates, names, top choices, and so on. Longer passwords are likewise better compared to short ones.

176

What are entryways?

Reference answer

Entryways give availability between at least two network sections. It is normally a PC that runs the door programming and gives interpretation administrations. This interpretation is key in permitting various frameworks to convey on the network.

177

What is a spine network?

Reference answer

A spine network is a centralized framework designed to distribute various routes and data to multiple networks. It also handles the management of bandwidth and multiple channels.

178

Explain the process of subnetting and how you would allocate IP address space for a lab.

Reference answer

Subnetting involves dividing a larger IP network into smaller, manageable subnets by borrowing bits from the host portion of the subnet mask. For a lab, I would first determine the number of devices and future growth, then choose a private IP range (e.g., 10.0.0.0/8 or 192.168.0.0/16). I would create subnets based on functional groups (e.g., management, test devices, voice) using variable-length subnet masking (VLSM) to minimize waste. Each subnet would be documented in an IP address management (IPAM) system.

179

When you move the NIC cards starting with one PC then onto the next PC, does the MAC address gets moved also?

Reference answer

Indeed, that is on the grounds that MAC addresses are hard-wired into the NIC hardware, not the PC. This additionally implies that a PC can have an alternate MAC address when another supplanted the NIC card.

180

What does the physical layer do?

Reference answer

The physical layer performs the transformation from data bits to electrical signals and vice versa. This is where network devices and cable types are considered and configured.

181

What is COBIT?

Reference answer

COBIT® is a framework for developing, implementing, and monitoring information technology and management practices. It is a framework by ISACA (Information System Audit and Control Association) designed for all IT governance to bridge the gap between technical issues, business risk, and control requirements.

182

What are the two methods of using a key for WPA and WPA2?

Reference answer

The two methods are: - Preshared key: A single key used for encryption, common at home, but lacks control and is stored in clear text in Windows registry. - 802.1x and EAP: Used for serious setups, allowing user authentication and port-based control.

183

How To Get an IP Address from Domain Name?

Reference answer

Answer: We can get an IP address from a domain name using ping commands and nslookup command. For this, use command-line tools like PING or nslookup to get the IP address. Run the commands “PING example.com” or “nslookup example.com” on command prompt or terminal window.

184

What does career progression look like for you?

Reference answer

The final question of our 30 network engineer interview questions to prep you for success requires you to do some real thinking about your personal development and where you want to get to. Of course, whether youâ€™re applying for entry-level network engineer jobs or senior and executive roles within the field, each candidate is different and will have their own idea of what career progression looks like to them. The interviewer will know this and may ask this question to better understand your motivations and why youâ€™re pursuing this particular role within your company. When youâ€™ve provided an answer to this question, your future employer will be able to put measures in place to support you with your network engineer career progression, potentially through training or development. Unlike other questions listed in this guide, we're not going to give you the answer to how to prepare for network engineer interview questions like this. Why? Because we feel you're the only person that can answer this question if you truly want to progress in your network engineering career.

185

What is a router and what is its main job?

Reference answer

A router is a networking device that forwards data packets between computer networks. It acts as a traffic controller, selecting the best path for data to travel to its destination. The main job of a router is to connect multiple networks and forward data packets between them. It does this by examining the destination IP address of each packet and using routing tables to determine the optimal path to send it. This ensures efficient and reliable communication across different networks, whether it's a local network or the internet.

186

What is a hub?

Reference answer

A hub alludes to a point or joint where an association happens. It very well may be a PC or gadget that is important for a network. At least two hubs are expected to shape a network association.

187

How does an access point's transmit power affect network coverage?

Reference answer

Higher transmit power extends the coverage area of an access point, allowing it to reach more devices and cover a larger space. However, excessive power can lead to interference with other networks and reduce overall performance.

188

What is a node?

Reference answer

Types of technical network engineer interview questions like this can be answered in this simple but effective way that tells the interviewer you know what youâ€™re talking about. â€œA node is a point or junction where connections occur, representing a computer or device within a network. To establish a network connection, at least two nodes are required to interact with each other.â€

189

What are some factors to consider when performing a wireless site survey?

Reference answer

Factors to consider include: - Building layout and obstacles: Walls, furniture, and metal objects can affect signal strength. - Number of users and devices: The number of devices that will be connected to the network. - Data usage patterns: The type of applications and data usage patterns. - Interference sources: Identify and mitigate interference from other wireless devices.

190

How would you design a network to support a large number of IoT devices?

Reference answer

To support a large number of IoT devices, a multi-layered network design is essential. Key considerations include: leveraging protocols optimized for low bandwidth and intermittent connectivity like MQTT, CoAP, or LwM2M. Implementing a hierarchical network architecture with local gateways aggregating data before sending it to a central server reduces bandwidth consumption and processing load on the core network. Scalable infrastructure is critical. This includes using a cloud-based platform that can dynamically provision resources as the number of devices grows, utilizing message queues for asynchronous communication and buffering, and considering edge computing to process data closer to the source, reducing latency and bandwidth requirements. Strong security measures are also paramount, including device authentication, encryption, and regular security audits. Network segmentation helps isolate compromised devices.

191

Explain IPv6 Features.

Reference answer

- Vast address space (128-bit) - Auto-configuration (SLAAC) - Simplified headers - IPsec natively supported - No NAT required

192

Define the applications of 5G NR, including eMBB, mMTC, and URLLC.

Reference answer

5G NR serves various applications categorised into enhanced Mobile Broadband (eMBB), massive Machine Type Communications (mMTC), and Ultra-Reliable Low Latency Communications (URLLC). eMBB caters to high-data-rate applications like augmented reality, mMTC facilitates connectivity for a massive number of devices, and URLLC ensures low-latency and highly reliable communication, crucial for applications like autonomous vehicles and industrial automation.

193

A colleague based at a branch office loses remote access. How do you assist?

Reference answer

Tests the candidate's knowledge of resolving network problems.

194

What is the purpose of using multiple SSIDs on an access point?

Reference answer

Multiple SSIDs allow an access point to broadcast different network names, enabling the segregation of traffic for various user groups (e.g., employees, guests). It helps in managing network access and applying different security policies for each SSID.

195

What is SMTP?

Reference answer

SMTP is short for Simple Mail Transfer Protocol. This convention manages all interior mail and gives the important mail conveyance administrations on the TCP/IP convention stack.

196

Have you set up home Wi-Fi networks? What are the basic steps?

Reference answer

Yes, I have set up home Wi-Fi networks. The basic steps usually involve first connecting the modem to the internet. Then, I connect the Wi-Fi router to the modem using an ethernet cable. After that, I power on both devices and wait for them to initialize. The next step is configuring the Wi-Fi network. This typically involves accessing the router's configuration page via a web browser (usually by typing the router's IP address, like 192.168.1.1, into the address bar). I then set up a network name (SSID) and a strong password (WPA2 or WPA3 encryption is preferred). Finally, I save the settings and connect my devices to the newly created Wi-Fi network using the SSID and password. Some routers also have WPS for quick setup, though this is less secure.

197

How do you handle interference in a wireless network?

Reference answer

To handle interference: - - Identify the source of interference using spectrum analyzers. - Change wireless channels to reduce overlap with other networks. - Adjust access point placement and transmit power. - Implement shielding or use different frequency bands to mitigate interference.

198

What is the purpose of a subnet mask, and how does it affect network communication?

Reference answer

A subnet mask is used to divide an IP address into network and host portions. It determines which part of an IP address identifies the network and which part identifies individual devices on that network. Subnet masks are crucial for routing data within a network. For example, a subnet mask of 255.255.255.0 in the IP address 192.168.1.0 would mean that the first three octets (192.168.1) are the network portion, and the last octet (0) identifies individual devices on that network.

199

How would you diagnose a slow network performance issue affecting multiple users?

Reference answer

To diagnose a slow network performance issue affecting multiple users, I'd start by gathering information: How many users are affected? When did the issue start? What applications are slow? Then, I'd check the basics: Isolate the problem (is it specific to a subnet or application?), examine network device status (routers, switches, firewalls), and monitor network utilization (bandwidth usage, packet loss, latency) using tools like ping , traceroute , iPerf , and network monitoring software. Analyzing these metrics will help pinpoint the bottleneck. Next, I'd investigate potential causes: saturated network links, faulty network hardware, DNS resolution issues, application server overload, or even a malware infection. I'd prioritize based on the data gathered, focusing on the most likely culprits first. For example, high latency might indicate a WAN link issue, while high CPU usage on a server might suggest an application problem. Corrective actions might involve upgrading network hardware, optimizing application configurations, or implementing traffic shaping policies.

200

What is a wireless LAN controller (WLC)?

Reference answer

A WLC is a device that centrally manages multiple access points (APs) in a wireless network. It provides centralized configuration, monitoring, and security for the wireless infrastructure.

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