Top Wireless Network Analyst Job Interview Questions

1

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

Reference answer

- Wireless network: Uses radio waves for short-range connections within a building or small area. - Cellular network: Uses cell towers and cellular technology for long-range connections over a wide geographical area.

2

Name the three means of user authentication.

Reference answer

The three primary means of user authentication are: a) Password-based authentication: Passwords, commonly used for authentication, involve users providing a secret passphrase alongside a username for access. While simple, they face security risks like guessing, phishing, and reuse due to their susceptibility. b) Multi-Factor Authentication (MFA): MFA demands users provide two or more authentication factors, like passwords, mobile phones, or biometric data, to verify identity. This method strengthens security by adding layers of verification beyond passwords, heightening the difficulty of unauthorized access attempts. c) Public Key Infrastructure (PKI) authentication: PKI authentication relies on asymmetric Cryptography to authenticate users. Each user is issued a pair of cryptographic keys: a public key and a private key. The public key is shared openly, while the private key is kept secret.

3

What is the Main Difference Between Layer 3 Switches and Routers?

Reference answer

Routers operate at the Network Layer, using IP addresses for routing, while switches operate at the Data Link Layer, using MAC addresses for data forwarding. Routers connect different networks, whereas switches manage data within the same network.

4

How is sending a letter similar to data traveling on the internet?

Reference answer

Sending a letter is similar to data traveling on the internet because both involve breaking down a message into manageable parts, addressing it to the correct recipient, and using a network to deliver it. With a letter, the message is the text on the paper, the address is the destination, and the postal service is the network. Similarly, on the internet, data is broken down into packets, each packet has an IP address for the destination, and routers act as the postal workers, directing the packets across the network. Just as a letter might pass through multiple postal offices, data packets may traverse several routers before reaching their final destination. Both systems rely on a standardized process to ensure delivery, although the internet uses protocols like TCP/IP to ensure reliable and ordered delivery of packets, which is more sophisticated than the basic letter system.

5

Which of the following factors is primarily used by Spanning Tree Protocol (STP) to elect the root bridge in a network?

Reference answer

Bridge Priority

6

What's your experience with WLAN design, and describe your most successful outcome with WLAN design?

Reference answer

This question evaluates the candidate's design expertise, including coverage planning, capacity analysis, and successful deployment outcomes.

7

What are business analyst interview questions with answer blueprints?

Reference answer

Business analyst interview questions with answer blueprints for entry-level candidates, career switchers, and internal promotions — plus STAR examples.

8

Can you explain the OSI model and its relevance in network troubleshooting?

Reference answer

Assessment: Evaluate the candidate's understanding of fundamental networking concepts and their ability to articulate technical information clearly. Red flags: Inability to explain the OSI model or confusion regarding its relevance may indicate a lack of basic networking knowledge.

9

What is the difference between TCP and UDP?

Reference answer

TCP (Transmission Control Protocol) provides reliable, ordered, and error-checked delivery of data and ensures data packets arrive intact and in sequence. UDP (User Datagram Protocol) is simpler and faster but does not guarantee delivery, order, or error-checking. Because of that, TCP is suitable for applications requiring reliability, like web browsing and email, while UDP is best for applications needing speed, like streaming and online gaming.

10

What is Zero Trust Security?

Reference answer

Zero Trust Security operates on the principle that no user or system, regardless of their location, should be trusted by default. It demands rigorous verification for anyone attempting to access network resources, minimizing the risk of unauthorized access and internal threats.

11

What is STP and why is it important?

Reference answer

STP (Spanning Tree Protocol) prevents network loops in Ethernet networks with redundant paths. It achieves this by identifying and blocking the redundant paths, ensuring there is only one active path between network devices. By dynamically adjusting to changes in the network topology, STP maintains a loop-free and stable network, which helps ensure continuous data flow and prevents broadcast storms.

12

Describe your experience with configuring and managing firewalls.

Reference answer

Look for familiarity with firewall rules, access control lists, and common security protocols. Candidates should be able to explain how they would configure a firewall to protect a network from specific threats.

13

Specify the range and speed characteristics of 5G NR Technology.

Reference answer

5G NR offers impressive range and speed characteristics, essential for diverse applications. 5G NR boasts an extended range, reaching up to 10 kilometres, coupled with remarkable speeds exceeding 10 Gbps. This ensures reliable connectivity in both urban and rural settings, while the high speeds support bandwidth-intensive applications, including high-definition video streaming and virtual reality.

14

What is a hidden SSID?

Reference answer

A hidden SSID is a wireless network name that is not broadcast. Devices need to know the SSID manually to connect, making it slightly more difficult for unauthorized users to discover the network.

15

What is VLAN (Virtual Local Area Network), and why is it used?

Reference answer

A VLAN is a logical segmentation of a physical network into multiple virtual networks, allowing devices to communicate as if they were on the same physical network, even if they are physically separated. VLANs enhance network security, efficiency, and management by isolating traffic and reducing broadcast domains. For example, in a large organization, VLANs can be used to separate departments like HR, Finance, and IT, ensuring that each group's data remains isolated while sharing the same physical infrastructure.

16

Difference between UWB and Wi-Fi?

Reference answer

UWB vs Wi-Fi: UWB is short-range and high-bandwidth, ideal for personal area networks; Wi-Fi is longer-range and suitable for local area networks.

17

How does NAT (Network Address Translation) work, and why is it important in networking?

Reference answer

NAT is a technique used to modify network address information in packet headers during transit. It's commonly used in routers to allow multiple devices on a local network to share a single public IP address for internet access. NAT plays a critical role in conserving IPv4 addresses and enhancing network security by hiding internal network structures. For instance, when a computer on a local network requests a web page, the router performs NAT to translate the private IP address of the requesting computer into the router's public IP address, ensuring the response returns to the correct device.

18

What is WLAN functionality and why is it important?

Reference answer

The content defines WLAN functionality and its importance in connecting wireless devices to the network, but does not provide specific details in the given text.

19

What is encryption?

Reference answer

Encryption is the process of encoding information into a code that is unintelligible to unauthorized users. This data is then decoded or decrypted back to its normal, readable format using a secret key or password. Encryption ensures that data intercepted in transit remains unreadable, as the user must have the correct password or key to decrypt it.

20

How does network geography influence your choice to set a network?

Reference answer

Network geography directs what media you should use to interconnect network gadget. It additionally fills in as a premise on what materials, connectors, and terminations are pertinent for the arrangement.

21

What is the function of a wireless network management system (WMS)?

Reference answer

A wireless network management system (WMS) provides centralized control and monitoring of wireless network components. It helps manage configuration, performance, security, and troubleshooting, offering insights and analytics to optimize network operations.

22

What is the difference between 802.11a, 11b, 11g, and 802.11n?

Reference answer

The difference between 11a, 11b, 11g, and 11n lies in terms of data rate, frequency of operation, distance coverage, and more.

23

How does data transmission work in a Local Area Network (LAN)?

Reference answer

Data transmission in a Local Area Network (LAN) involves the process of sending data from one device to another within a localized network, such as a home or office. Here's a simplified description of this process: First, the device intending to send data (source device) prepares the data for transmission. It breaks down large amounts of data into smaller units known as packets. These packets are then encapsulated with necessary headers containing network protocol and addressing information, which helps guide them to their destination. Once the data is prepared, the source device transmits the data packets onto the network through its network interface card (NIC). The NIC converts the digital data into electrical signals (or radio waves for wireless connections) that can be sent across the network. Within the network, devices such as routers and switches help guide these data packets towards their intended recipient. These devices read the addressing information in the data packet's header and determine the optimal path for the packet to reach its destination. Upon reaching the destination device, the data packets are reassembled back into their original format and then processed. If the data was encrypted for secure transmission, the destination device would decrypt it. In case of any errors during transmission, protocols such as TCP (Transmission Control Protocol) within the LAN will ensure the faulty packets are retransmitted, thereby ensuring reliable data transmission. It's important to note that the exact process can vary based on multiple factors, including the protocols in use, network topology, type of media used for transmission, and more.

24

What are the basic security measures in WLANs and why are they not secure?

Reference answer

The basic security measures are: - Filtering MAC addresses: Not secure because MAC addresses are sent in clear text. - Hiding SSID: Not secure because the SSID is still visible in probe requests and probe responses. - Enabling WEP encryption: Not secure because WEP can be hacked in 5-10 minutes regardless of key size.

25

What is VTP (VLAN Trunking Protocol)?

Reference answer

VTP synchronizes VLAN configurations across Cisco switches within the same domain. Modes: Server, Client, Transparent.

26

What is a VPN and why do people use it?

Reference answer

A VPN (Virtual Private Network) creates a secure, encrypted connection over a less secure network, like the public internet. It essentially acts as a tunnel, protecting your data as it travels between your device and the VPN server. Think of it like sending a letter in a locked box; even if someone intercepts it, they can't read it without the key. People use VPNs for several reasons: to protect their online privacy and security on public Wi-Fi, to bypass geographical restrictions and access content that might be blocked in their region (e.g., streaming services), and to mask their IP address, making it harder to track their online activity. Some also use it to securely access resources on a private network, like a company's internal server, from a remote location.

27

What is a wireless range extender?

Reference answer

A wireless range extender is similar to a repeater but typically uses a wired connection to the main WAP for improved performance and stability. It can also improve signal strength and expand network coverage.

28

Explain how BGP works and its role in large networks.

Reference answer

BGP (Border Gateway Protocol) is a dynamic routing protocol that exchanges routing information between autonomous systems (AS). It operates over TCP, sending routing updates to maintain route tables. In large networks, BGP facilitates inter-AS routing and supports complex routing policies and filtering.

29

What are some common wireless networking troubleshooting techniques?

Reference answer

Common troubleshooting techniques include: - Check signal strength and location of devices. - Verify network settings and security configuration. - Identify and address potential interference sources. - Check for network connectivity issues. - Reboot devices and access points.

30

Describe in detail what happens when you open the web browser on a client to surf google.com

Reference answer

This article gives a very in-depth breakdown of the process. You just need to know the high level details mainly around DNS and HTTP request

31

What tools are commonly used for network troubleshooting?

Reference answer

Several tools are commonly used for network troubleshooting. ping is fundamental for verifying basic connectivity and measuring latency. traceroute (or tracert on Windows) maps the path packets take to a destination, identifying potential bottlenecks. nslookup or dig helps diagnose DNS issues by querying DNS servers. More advanced tools include tcpdump or Wireshark, which capture and analyze network traffic, enabling detailed inspection of packets. Network monitoring tools like Nagios or Zabbix provide real-time insights into network performance and can alert administrators to potential problems. netstat or ss can display network connections, routing tables, and interface statistics on a host.

32

What are the differences between IPv4 and IPv6?

Reference answer

IPv4 (Internet Protocol version 4) uses 32-bit addresses giving about 4.3 x 10^9 unique addresses. This address space is running out quickly because the Internet has exploded. Internet Protocol version 6 (IPv6) employs 128 bit addresses, allowing an astronomically larger address space (effectively limitless) to support the explosive growth of internet connected devices.

33

What is Network Segmentation?

Reference answer

Network Segmentation divides a large network into smaller, isolated segments, which helps limit the impact of security incidents. It restricts the lateral movement of attackers, making it harder for them to navigate the network and minimizing the potential for breaches.

34

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

Reference answer

In the OSI model, as a data packet moves from the lower to upper layers, headers get removed.

35

What is the purpose of a wireless network access control list (ACL)?

Reference answer

A wireless network ACL restricts or permits traffic based on predefined rules, enhancing security by controlling access to network resources. It can be used to block unauthorized devices or limit access to specific services or applications.

36

What is the role of a wireless router in a network?

Reference answer

A wireless router combines the functionality of a router and a WAP. It provides routing services, manages network traffic, and acts as a central point for wireless connections. It typically includes a built-in WAP to create a wireless network.

37

Tell me how you manage to stay informed about new network solutions?

Reference answer

Evaluates whether the candidate keeps up with advancements in the field.

38

What is VPN?

Reference answer

VPN stands for Virtual private network. - It is considered VIRTUAL because it establishes a digital pathway, without needing a physical cable, between the user's device and the VPN server. - It is considered PRIVATE due to its ability to encrypt user data and conceal their Internet Protocol (IP) address. - It is considered a NETWORK due to its ability to connect various computing devices, namely the user's device and the VPN server. Virtual Private Networks simplify the transmission of all network traffic to a virtual network, thus allowing users to access local network resources remotely and bypass Internet censorship. The majority of operating systems have built-in VPN support. VPNs were initially designed to connect separate corporate networks over the internet securely or to provide remote access to a company's network.

39

What is DSSS and CCK modulation scheme?

Reference answer

Direct Sequence Spread Spectrum (DSSS) and Complementary Code Keying (CCK) are modulation schemes employed in WLAN devices compliant with IEEE 802.11b.

40

Explain Routing.

Reference answer

Routing determines the best path for data to travel between networks. Static Routing: Manual configuration. Dynamic Routing: Uses protocols like OSPF, EIGRP, or BGP for automatic updates.

41

Explain the difference between TCP and UDP, and when you would use each, with a code example.

Reference answer

TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are both internet protocols used for sending data packets over a network. TCP is connection-oriented, meaning it establishes a connection before sending data, ensures reliable data transfer with error checking and retransmission, and guarantees ordered delivery of packets. UDP, on the other hand, is connectionless, sending data packets without establishing a connection. It's faster than TCP but doesn't guarantee delivery, order, or error checking. Choose TCP when reliability is crucial, such as for web browsing, email, and file transfer. Choose UDP when speed is more important than reliability, such as for streaming video, online gaming, and DNS lookups where occasional packet loss is tolerable. Code example: using socket.SOCK_STREAM creates a TCP socket, while socket.SOCK_DGRAM creates a UDP socket.

42

Describe a time you've used RFID technologies in your day-to-day management?

Reference answer

This question evaluates the candidate's practical experience with Radio Frequency Identification (RFID) for asset tracking or inventory management in wireless environments.

43

Tell us about the biggest network youâ€™ve engineered

Reference answer

Interviewers will typically ask these types of network engineer interview questions as they'll want to know if you have experience designing, implementing and troubleshooting networks similar to or the same size as the networks they and their clients use. When it comes to these types of network engineer interview questions and answers, here's an example of a response you could give: â€œAmong the networks I've designed, implemented, and provided troubleshooting support on, the biggest one I worked on was with my former employer. This project involved interconnecting numerous locations across the country, providing seamless communication for their employees working both onsite and remotely around the world - the latter of which involved me setting up secure VPNs to enable safe access to the network from remote locations.â€ Even if you have yet to work on networks of the same scale, this won't necessarily mean you won't fit the employer's requirements. Your enthusiasm and other credentials will always be taken into account.

44

What is a network baseline and why is it important?

Reference answer

A network baseline is a set of performance metrics collected over time under normal operating conditions. It serves as a reference point for identifying deviations or anomalies in network performance and helps in troubleshooting and network performance optimization.

45

What is MU-MIMO, and how does it enhance wireless performance?

Reference answer

MU-MIMO (Multi-User, Multiple Input, Multiple Output) allows a wireless access point to communicate with multiple devices simultaneously, rather than sequentially. This technology enhances performance by increasing the efficiency and speed of data transmission for multiple users.

46

What is the OSI model and what are its layers?

Reference answer

The OSI model is a 7-layer conceptual framework describing network communication. From top to bottom: Application (network services for apps), Presentation (data formatting and encryption), Session (communication sessions), Transport (reliable/unreliable delivery via TCP/UDP), Network (routing and IP addressing), Data Link (physical addressing and media access control), Physical (cables, connectors, and electrical signals).

47

What is a LAN?

Reference answer

LAN stands for Local Area Network. It alludes to the association among PCs and other network gadget that are situated inside a little actual area.

48

What is the most extreme length considered a UTP link?

Reference answer

A solitary section of the UTP link has a permissible length of 90 to 100 meters. This limit can be overwhelmed by utilizing repeaters and switches.

49

Which of the following TCP port numbers is commonly associated with the Secure Shell (SSH) protocol?

Reference answer

22

50

Do you have experience with Cisco Prime, WLCs, and other Cisco products?

Reference answer

This question assesses familiarity with specific Cisco wireless management tools and controllers, which are common in enterprise networks.

51

How many MCS rates are there for 802.11ac?

Reference answer

There are nine for a specific Spacial stream. http://wirelessonthego.postach.io/post/802-11ac-mcs-rates

52

Describe the purpose of a captive portal in wireless networking.

Reference answer

A captive portal is a web page that users are redirected to when connecting to a public or guest wireless network. It typically requires users to authenticate or accept terms of service before granting access to the internet or network resources.

53

What is DNS?

Reference answer

DNS is known as the phonebook that helps in translating the domain into a computer-readable IP address. DNS allows users to access websites without having to memorize long strings of numbers. For example, instead of typing 104.26.10.228, you can type pynetlabs.com, and DNS will find your corresponding IP address.

54

What are the benefits of SD-WAN?

Reference answer

Here are some benefits of SD-WAN: - It simplifies WAN Management. - It reduces WAN costs. - Provides more security. - Increased Bandwidth and efficiency. - It provides easier network management.

55

What is the difference between ipconfig and ifconfig commands?

Reference answer

The ipconfig command stands for Internet protocol configuration that is used for configuring networking devices on Windows machines. All the TCP/IP network summary data can be displayed through this command using the command line. It is also used for refreshing the settings of Dynamic Host Configuration Protocol (DHCP) and Domain Name System (DNS). The ifconfig stands for interface configuration. The command is used for configuring and managing the network interface parameters on the TCP/IP network. The network interface IP addresses can be viewed with the help of this command. The command is used on MAC, LINUX and Unix operating systems.

56

What is the difference between static routing and dynamic routing?

Reference answer

Static routing involves manually configuring the routing table with fixed paths for data packets. It's simple and secure but requires manual updates when network changes occur. Dynamic routing, on the other hand, uses algorithms and protocols like OSPF or EIGRP to automatically adjust paths based on network conditions. It adapts to changes more efficiently and reduces administrative overhead, but it may be more complex and resource-intensive to manage.

57

What is the difference between 2.4GHz and 5GHz Wi-Fi bands?

Reference answer

2.4GHz Wi-Fi band offers a larger coverage area but lower speeds, while the 5GHz band provides faster speeds but with a smaller coverage area and less penetration through walls.

58

Why is WPA encryption preferred over WEP?

Reference answer

WPA is preferred over WEP because WEP uses static keys and RC4 encryption, which can be hacked in minutes, while WPA uses TKIP for dynamic keying, significantly improving security.

59

What cell edge and cell overlap would you survey for a voice deployment

Reference answer

-65 to -67 dBm

60

Tell me about your most challenging network installation. What did you learn?

Reference answer

Reveals whether the candidate's experience and knowledge are suited to the role.

61

What is a wireless MAN (WMAN)?

Reference answer

A WMAN is a wireless metropolitan area network, connecting devices over a larger area than a WLAN, typically covering a city or a large campus.

62

What are the advantages and disadvantages of IPv6 over IPv4?

Reference answer

IPv6 offers several advantages over IPv4, primarily due to its larger address space (128-bit vs. 32-bit). This virtually eliminates address exhaustion, a major concern with IPv4. Other benefits include simplified header format leading to faster processing, stateless address autoconfiguration (SLAAC) which simplifies network administration, and built-in security features like IPSec. Multicasting is also improved. However, IPv6 also has disadvantages. The primary issue is the lack of backward compatibility with IPv4, requiring transition mechanisms (dual-stack, tunneling, or translation) for interoperation. These transition mechanisms can add complexity to network configurations. Also, Network Address Translation (NAT), commonly used in IPv4 to conserve addresses and enhance security, is less necessary in IPv6 (due to the huge address space) but this means each device needs its own publicly routable address potentially raising privacy concerns. Finally, widespread deployment of IPv6 is still incomplete, creating potential compatibility issues with legacy systems and networks.

63

Explain the significance of Mini slot in 5G Technology.

Reference answer

Mini slots are a feature in 5G NR designed to enhance scheduling flexibility. They allow for more granular scheduling by dividing a slot into smaller units. This flexibility is vital for accommodating diverse communication needs, optimizing resource utilization, and supporting various services with distinct requirements in terms of latency and reliability, as detailed in the 5G Technology Guide.

64

How are receptionist interview questions answered?

Reference answer

Receptionist interview questions, answered one by one with simple frameworks, transferable-skill angles, and sample responses for candidates with no.

65

How to send unicast probe request? Which field is set?

Reference answer

Unicast Probe Request: i) Destination address is ff:ff:ff:ff:ff:ff and SSID field is set to target AP's SSID. Or ii) Destination address is set to target AP's MAC address and SSID field is set to target AP's SSID. Unicast probe request SSID field is always set to target AP's SSID.

66

What is a Network?

Reference answer

A network is a collection of devices that can communicate with each other to share resources and information. Depending on its size and scope of use, a network can be of different types, such as PAN, LAN, WAN, etc.

67

What is the role of a wireless network gateway?

Reference answer

A wireless network gateway serves as the interface between the wireless network and external networks (e.g., the internet). It manages traffic, provides security features like NAT (Network Address Translation), and may include firewall capabilities.

68

How do you start troubleshooting a wireless network issue?

Reference answer

This question evaluates the candidate's systematic approach to diagnosing wireless network problems, such as checking signal strength, interference, or configuration errors.

69

What is the reason for links being protected and having bent sets?

Reference answer

The main role of this is to forestall crosstalk. Crosstalk is electromagnetic impedances or commotion that can influence information being communicated across links.

70

What is the frequency range of the 802.11a standard?

Reference answer

5GHz Frequency.

71

What benefits does fiber optics have over other media?

Reference answer

One significant benefit of fiber optics is that it is less defenseless from electrical obstruction. It likewise bolsters higher bandwidth, which means more information can be communicated and gotten. Signal debasing is additionally extremely insignificant over significant distances.

72

What are nodes and links?

Reference answer

Node: Any communicating device in a network is called a Node. Node is the point of intersection in a network. It can send/receive data and information within a network. Examples of the node can be computers, laptops, printers, servers, modems, etc. Link: A link or edge refers to the connectivity between two nodes in the network. It includes the type of connectivity (wired or wireless) between the nodes and protocols used for one node to be able to communicate with the other.

73

Explain bunching support

Reference answer

Bunching support alludes to the capacity of a network working framework to associate various workers in a flaw lenient gathering. The fundamental motivation behind this is on the off chance that one worker fizzles, all handling will proceed with the following work in the group.

74

How do you secure wireless networks?

Reference answer

Secure wireless networks use strong encryption protocols, robust authentication mechanisms, and access controls. Regular monitoring and updates help address vulnerabilities, ensuring data confidentiality and reducing unauthorized access risks.

75

What is the difference between a MAC address and an IP address?

Reference answer

A MAC (Media Access Control) address is a unique identifier assigned to a network interface card (NIC) for communication within a local network. It operates at the data link layer. An IP (Internet Protocol) address, on the other hand, identifies devices across different networks and operates at the network layer. MAC addresses are permanent, while IP addresses can change.

76

Describe the OSI Reference Model

Reference answer

Open System Interconnections (OSI) is a network architecture model based on the ISO standards. It is called the OSI model as it deals with connecting the systems that are open for communication with other systems. The OSI model has seven layers. The principles used to arrive at the seven layers can be summarized briefly as below: - Create a new layer if a different abstraction is needed. - Each layer should have a well-defined function. - The function of each layer is chosen based on internationally standardized protocols.

77

Can I mix wireless equipments from different vendors, elaborate on it?

Reference answer

- You can mix wireless equipments from different vendors, but the recommendation is that you should prefer only prescribed vendors, because most wireless networking hardware vendors support the 802.11 standard they can inter operate. However, we recommend verification as the standard is a fairly recent one, and does specify two different methods for wireless communications; Frequency Hopping (FH) and Direct Sequence Spread Spectrum (DSSS or DS), which are not interoperable. - When purchasing wireless networking hardware from separate vendors be sure to obtain guarantees from the vendors that the hardware will interoperate and follows the standards. - Within a short time we expect all new wireless cards, like ethernet cards, to become inexpensive, ubiquitous and totally interoperable. - Also of note is that the latest version of the standard defines 11mbps and 5.5mbps networking, with support for the older standard 1mbps and 2mbps speeds. This provides some compatibility with different or older equipment. Note that this new standard covers DS-type Networks, not FH types. - Software access points such as InterGate which uses the wireless interface of the host computer should have no compatibility issues with third party wireless hardware, as long as standards are followed. Typically wireless hardware is identified to the software as a network interface, and therefore can be used in the same way as any other network card. So you can choose them from different vendors but keeping these things in mind and then go ahead.

78

What is Dynamic Transmit Power Control (DTPC)?

Reference answer

DTPC: Adjusts transmit power of APs and clients to ensure balanced communication and save battery life.

79

What is Internetworking?

Reference answer

Internetworking is the process of incorporating multiple computer networks to create a single, wide network architecture that allows for smooth communication and data exchange across different devices. The installation of routers, switches, and gateways allows for efficient data transmission and enables internetworking by connecting interconnected networks.

80

Describe a time you encountered a network issue at home and how you resolved it.

Reference answer

During a home network setup, I encountered an issue where my Wi-Fi printer wasn't connecting. Initially, all devices except the printer were online. I started with basic troubleshooting: ensuring the printer was powered on and connected to the correct Wi-Fi network. I checked the printer's network settings through its control panel. The printer was showing connected, but I couldn't ping it from my laptop. I then suspected an IP address conflict. I accessed my router's admin panel and observed that another device had been assigned the same IP address that the printer was trying to use. I resolved this by assigning a static IP address to the printer within the router's DHCP settings, outside the dynamic allocation range. After this change, the printer connected without issue, and I could successfully print from all devices on the network.

81

How do you stay up-to-date with networking technologies?

Reference answer

I stay up-to-date with networking technologies through a combination of online resources, professional development, and community engagement. I regularly read industry publications and blogs such as the Network World, Packet Pushers, and vendor-specific blogs (e.g., Cisco, Juniper) to understand current trends, new product releases, and emerging technologies like SD-WAN, SASE, and cloud networking. Furthermore, I actively participate in online forums like Stack Overflow and Reddit's r/networking to learn from others' experiences and contribute my own knowledge. I also take advantage of online courses and certifications offered by platforms like Coursera, Udemy, and vendor-specific training programs to deepen my understanding of specific networking concepts and tools. Attending webinars and virtual conferences also helps me to keep abreast of the latest advancements in the field.

82

What is a DNS?

Reference answer

DNS stands for domain name system. Websites are accessed by their domain names such as google.com and yahoo.com. But these names are not understood by the computer. The DNS translates these names into IP addresses so that the browsers can load them for the users. DNS converts the hostname of the website into an IP address that is readable by the computer. The converting of hostnames into IP addresses is called forward lookup. Converting or resolving IP addresses into hostnames is called backward lookup.

83

What are culture fit interview questions?

Reference answer

Culture fit interview questions are easy to answer badly. Get the most common questions, side-by-side strong and weak answer patterns, and a simple rubric.

84

What is a default gateway?

Reference answer

A default gateway is an essential component of networking that acts as a bridge connecting your local network to the internet. When a device wants to communicate with a system outside its local network, it doesn't always know the pathway to that external network, that's where a default gateway comes in. Consider the gateway as a translator between a small local network and the vast internet. When a device sends a request to access a resource outside its local network, that request is sent to the default gateway. The gateway, usually your router, then takes it from there to send the request to the internet. In other words, the default gateway is the device that routes traffic from the local network to other networks or subnets. Without it, your local network would be an island isolated from the rest of the digital world.

85

What is the TCP three-way handshake?

Reference answer

The TCP/IP handshake, or TCP three-way handshake, is a process used to establish a connection between two devices over a network before data is sent. It's named a "three-way handshake" because it involves three parts: SYN, SYN-ACK, and ACK. Here's how it works: The device initiating the connection (client) sends a SYN (synchronize) message to the other device (server). This message includes an initial sequence number for tracking data packets. The server then acknowledges receipt of the SYN message by sending back a SYN-ACK (synchronize-acknowledge) message. This message includes both an acknowledgement number (the initial sequence number from the client, increased by one) and a new sequence number for the server's own data packets. Finally, the client sends an ACK (acknowledge) message back to the server with the server's sequence number increased by one. This confirms that it correctly received the server's SYN-ACK message. This process of SYN, SYN-ACK, and ACK confirms that both devices are ready to exchange data and have the right sequence numbers. Once the handshake is completed, the TCP/IP connection is established, and data transfer can commence. The three-way handshake is crucial for initiating a reliable, ordered transfer of data between networked devices.

86

Changes in WLAN-11ac compared to previous versions?

Reference answer

802.11ac Enhancements: Includes Multi-User MIMO, wider RF channels, and more spatial streams for faster and more efficient network performance. There are 2 variants of 802.11ac — phase 1 and phase 2. 802.11ac is faster compared to previous standards because of the introduction of the below - Multi-User MIMO (MU-MIMO) — Clients get on and off the network quicker, allowing more clients to be served, Pre Wave 2 an access point would talk to the clients one at a time and this was called SU-MIMO. Multi-user MIMO is important because it allows access points and their many antennas to transmit (or talk) to multiple client devices all at the same time. This helps maximize air-time efficiency so that each client, regardless of what version of 802.11 it is running, gets the amount of airtime it's supposed to get based on the technology supported. - Wider RF Channels — Wave 2 improvement is the option to use 160-MHz channel widths. That's double what we saw with Wave 1 technology. Think of this as a 2 line interstate road where two additional lines have been added. The top speeds depend on the whether the AP supports 80-MHz or 160-MHz channels, as well as whether the wireless client devices tapping your network support Wave 2. - Four Spatial Streams — Wave 2 also supports four transmitting and receiving antennas while the previous iteration supported only three receive antennas. Just like we see in the image below, With 4 spatial streams an AP could send 4 streams of data to the same client at the same time. The client can then aggregate this 4 streams and thus improve its throughput. It is also important to notice that on the AP side, the greater the number of receive antennas, the greater the distance that a particular data rate can be sustained.

87

What is the role of wireless network planning tools?

Reference answer

Wireless network planning tools help design and optimize wireless networks by simulating coverage, analyzing signal strength, and identifying potential interference. They assist in determining access point placement and network configuration for optimal performance.

88

Explain OSI stack and differentiate with TCPIP protocol stack.

Reference answer

The OSI protocol stack is the generic stack developed to make it easy for different manufacturers' devices to inter-operate without any interfacing issues. The TCP/IP stack is specifically designed for internet applications.

89

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

Reference answer

In the OSI model, as a data packet moves from the upper to lower layers, headers are added. This header contains useful information.

90

Which of the following CIDR notations represents a network with a subnet mask of 255.255.255.0?

Reference answer

/24

91

What is a Network Gateway?

Reference answer

A Network Gateway acts as a control point between different networks, enforcing security policies and blocking unauthorized access. By managing and inspecting traffic, it prevents malicious activities and ensures network integrity.

92

Probe request is unicast or broadcast?

Reference answer

Probe Request can be unicast or broadcast. Broadcast Probe Request: Destination address is ff:ff:ff:ff:ff:ff and SSID field is blank. Unicast Probe Request: i) Destination address is ff:ff:ff:ff:ff:ff and SSID field is set to target AP's SSID. Or ii) Destination address is set to target AP's MAC address and SSID field is set to target AP's SSID.

93

Explain the difference between 2.4 GHz and 5 GHz frequency bands.

Reference answer

The 2.4 GHz band offers longer range but is more susceptible to interference and congestion from other devices (e.g., microwaves, Bluetooth). The 5 GHz band provides faster speeds and less interference but has a shorter range and lower penetration through obstacles.

94

How would you describe network topology?

Reference answer

These types of network engineer interview questions are designed to test your technical understanding to ensure you're suited to the network engineering role they're looking to fill. Keep your answer brief and to the point. Here's an appropriate response to give to an interviewer if they ask you this question. "Network topology refers to the organisation of components within a communication network. This structural representation illustrates nodes, devices, and network connections, which can be physically or logically arranged to demonstrate their interrelationships. For example, in a mesh topology, every device within the network is directly interconnected with each other device, creating a comprehensive and redundant network structure. As a result, every device in the mesh topology must possess a minimum of two network connections to facilitate seamless communication and ensure reliable data transmission. Engineers can design and optimise networks by understanding topology to efficiently meet their intended purposes."

95

How are IP tending to orchestrated and shown?

Reference answer

IP addresses are shown as a progression of four decimal numbers that are isolated by period or specks. Another expression for this plan is the spotted decimal arrangement. A model is 192.168.101.2

96

Which of the multiplexing techniques are used to combine analog signals?

Reference answer

To combine analog signals, commonly FDM(Frequency division multiplexing) and WDM (Wavelength-division multiplexing) are used.

97

In which OSI layer is the header and trailer added?

Reference answer

Headers and trailers are added to data packets at different layers of the OSI model. Typically, headers are added at the Network Layer (Layer 3), where logical addressing information, such as IP addresses, is encapsulated. Meanwhile, trailers are usually added at the Data Link Layer (Layer 2), where physical addressing, like MAC addresses, is appended.

98

Explain the OSI Model in Detail.

Reference answer

The OSI (Open Systems Interconnection) model describes how data moves through a network using seven layers: - Physical (Layer 1): Transmits bits through cables and signals. - Data Link (Layer 2): Handles framing, MAC addressing, and error detection (e.g., Ethernet). - Network (Layer 3): Responsible for logical addressing and routing (e.g., IP, OSPF). - Transport (Layer 4): Ensures end-to-end communication (TCP/UDP). - Session (Layer 5): Manages sessions between devices. - Presentation (Layer 6): Translates data formats (encryption, compression). - Application (Layer 7): Interface for end-user applications (HTTP, DNS).

99

What is EAP?

Reference answer

EAP (Extensible Authentication Protocol): Used in wireless communications for user authentication through an Access Point and an authentication server.

100

Identify the Key Performance Indicators (KPIs) employed in 5G NR.

Reference answer

KPIs are crucial metrics for assessing the performance of 5G networks. In 5G NR, they encompass metrics like latency, reliability, throughput, and coverage. These indicators help operators gauge the Network's efficiency and make informed decisions to optimise and enhance the user experience.

101

Explain the process of channel encoding in wireless communication.

Reference answer

Channel encoding involves adding redundant bits to the transmitted data to detect and correct errors introduced by the wireless channel. Common techniques include convolutional coding, turbo coding, and LDPC (Low-Density Parity-Check) coding, which improve the bit error rate (BER) performance at the cost of increased bandwidth.

102

Difference between Ad-Hoc and Infrastructure topology?

Reference answer

Ad-Hoc vs Infrastructure: Ad-Hoc is peer-to-peer, whereas Infrastructure relies on a central Access Point.

103

What is the minimum parameter needed on the access point to allow a wireless client to operate on it?

Reference answer

The minimum parameter is the SSID (Service Set Identifier), which identifies the network.

104

What is the purpose of an 802.1X authentication server in wireless networks?

Reference answer

An 802.1X authentication server (often a RADIUS server) provides centralized authentication for wireless clients. It verifies user credentials and grants access based on policies, enhancing network security and access control.

105

How do you ensure network security in a cloud computing environment?

Reference answer

Ensuring security in cloud environments involves multilayered measures, including access control, data encryption, identity authentication, security audits, and vulnerability management. Selecting reliable cloud providers and establishing strict Service Level Agreements (SLAs) are also critical to defining security responsibilities.

106

What is DHCP and how does it work (DORA process)?

Reference answer

DHCP (Dynamic Host Configuration Protocol) automates the assignment of IP addresses, subnet masks, default gateways, and other network parameters to devices on a network. This eliminates the need for manual configuration, simplifying network administration and reducing IP address conflicts. The process generally involves four key steps, often remembered as DORA: - Discover: The client broadcasts a DHCP Discover message to find available DHCP servers. - Offer: DHCP servers respond with a DHCP Offer message, offering an IP address and configuration parameters. - Request: The client broadcasts a DHCP Request message, requesting the offered IP address from a specific server. - Acknowledge: The chosen DHCP server sends a DHCP Acknowledge message, confirming the lease and providing the configuration details.

107

What is the difference between open and closed networks in wireless terms?

Reference answer

An open network does not require authentication or encryption, allowing any device to connect. A closed network requires authentication (e.g., WPA2) to join, providing a higher level of security by restricting access to authorized users.

108

Explain LAN (Local Area Network)

Reference answer

LANs are widely used to connect computers/laptops and consumer electronics which enables them to share resources (e.g., printers, fax machines) and exchange information. When LANs are used by companies or organizations, they are called enterprise networks. There are two different types of LAN networks i.e. wireless LAN (no wires involved achieved using Wi-Fi) and wired LAN (achieved using LAN cable). Wireless LANs are very popular these days for places where installing wire is difficult. The below diagrams explain both wireless and wired LAN.

109

What are the challenges of implementing Multi-Factor Authentication (MFA)?

Reference answer

Implementing MFA can be challenging due to user resistance, complexity, and potential usability issues. Balancing security and user experience is crucial for the successful deployment and adoption of MFA.

110

What is the difference between the internet and the World Wide Web (WWW)?

Reference answer

The internet is a vast global network of interconnected computer networks that use the TCP/IP protocol suite to communicate. It's the physical infrastructure – the cables, routers, and servers – that allows data to travel. Think of it as the roads and highways. The World Wide Web (WWW), on the other hand, is a collection of interconnected documents (web pages) and other resources, linked by hyperlinks and URLs. It's accessed over the internet using protocols like HTTP. Think of the WWW as the traffic – the cars, trucks, and buses – that travel on those roads. In short, the internet is the underlying network, while the World Wide Web is one of the services that runs on top of it. Email, file transfer (FTP), and online gaming are other examples of services that also use the internet.

111

Define Digital Signatures?

Reference answer

As the name sounds are the new alternative to signing a document digitally. It ensures that the message is sent to the intended use without any tampering by any third party (attacker). In simple words, digital signatures are used to verify the authenticity of the message sent electronically. OR A digital signature is a mathematical technique used to validate the authenticity and integrity of a message, software, or digital document.

112

What is a wireless WAN (WWAN)?

Reference answer

A WWAN is a wireless wide area network, connecting devices over a large geographical area, using cellular technology.

113

How do you answer a conflict interview question?

Reference answer

A conflict interview question is easier to answer when you know how to pick the right story, shape it with STAR, and adjust it for entry-level, mid-level, or.

114

Which frame has AID, Listen interval?

Reference answer

Association/Re-Association response frame contains AID. Association/Re-association request frame contains Listen Interval.

115

Do you have any experience managing WLAN security?

Reference answer

This question evaluates the candidate's knowledge of wireless LAN security practices, including encryption, authentication, and threat mitigation.

116

What are the common issues that can affect wireless signal quality?

Reference answer

Common issues include interference from other wireless devices, physical obstructions (e.g., walls, furniture), incorrect access point placement, and network congestion. Addressing these issues often involves optimizing channel settings, adjusting AP locations, and managing network traffic.

117

Common interferers on 2.4GHz

Reference answer

Microwave, 2.4 GHz video camera, 2.4GHz cordless phones, bluetooth devices etc

118

Which Diffie Hellman Group is Most Secure?

Reference answer

The most secure Diffie-Hellman group is currently considered to be Group 24 (2048-bit ECP) or higher, offering stronger encryption and resistance to attacks. Apart from that the security of a Diffie-Hellman (DH) group depends on the size and type of the underlying prime numbers or elliptic curves used.

119

What do you mean by a backbone network?

Reference answer

A backbone network is a network that has the connectivity infrastructure that is the main link for the various parts of a network. It has the capability of supporting networks spread over vast geographical areas. It can connect different networks within the same area or building, or different buildings within an area. Typically, a backbone network comprises routers, bridges, gateways, and switches.

120

What is the purpose of rack mounting network equipment and managing rack space?

Reference answer

Rack mounting ensures physical organization, proper airflow, cable management, and ease of access for maintenance. Managing rack space involves tracking available units (U), planning equipment placement to balance power and cooling, and labeling devices per production standards to avoid confusion during troubleshooting or upgrades.

121

What happens when you type a website address (URL) into your browser and press Enter?

Reference answer

First, the browser parses the URL to determine the protocol (e.g., HTTP or HTTPS), domain name (e.g., example.com), and path (e.g., /index.html). The browser then performs a DNS lookup to find the IP address associated with the domain name. The browser establishes a connection to the server at that IP address, sending an HTTP request for the specified resource. The server processes the request and sends back an HTTP response containing the requested data (HTML, CSS, JavaScript, images, etc.), which the browser then renders to display the webpage. If the request is HTTPS, an SSL/TLS handshake occurs to establish a secure connection before the HTTP request is sent. Any redirects will be followed during this process, issuing additional requests as necessary until the browser receives a final response it can display.

122

What technologies would you use to connect two remote offices, and what is inter-networking?

Reference answer

Technologies for connecting remote offices include VPN (Virtual Private Network): A VPN creates a secure, encrypted connection over the internet between remote offices. It allows remote sites to communicate as if they were on the same local network. Inter-networking refers to connecting multiple networks to allow them to function as a cohesive whole.

123

What are different network topologies?

Reference answer

Network topologies define how various devices are interconnected inside the network. Some of the common network topology types are: - Star Topology - Tree Topology - Bus Topology - Mesh Topology - Ring Topology - Point-to-Point Topology - Hybrid Topology

124

Can a routing table in the datagram network have two entries with the same destination address?

Reference answer

No.routing tables in the datagram network have two entries with the same destination address, not possible because the destination address or receiver address is unique in the datagram network.

125

What is Software-Defined Networking (SDN) and what are its benefits?

Reference answer

Software-Defined Networking (SDN) separates the control plane from the data plane in a network. Traditionally, these planes are coupled within network devices like routers and switches. SDN centralizes network control in a software controller, allowing administrators to manage network traffic programmatically and dynamically. Benefits for network management include: * Centralized Control: Simplifies network configuration and management through a single pane of glass. * Automation: Enables automated provisioning and configuration of network devices. * Flexibility: Allows for rapid adaptation to changing network requirements. * Programmability: Opens the network to innovation and allows developers to create custom network applications. * Cost Reduction: Optimizes resource utilization and reduces operational expenses.

126

What is the Difference Between TCP and UDP?

Reference answer

| Criteria | TCP | UDP | |---|---|---| | Type | Connection-oriented | Connectionless | | Reliability | Reliable (acknowledgments) | Unreliable (no ACKs) | | Speed | Slower due to overhead | Faster | | Use Case | Web, email, file transfer | Gaming, streaming, VoIP |

127

Describe star geography

Reference answer

Star geography comprises a focal center point that associates with hubs. This is one of the most effortless to set up and keep up. Here are experts/advantages of start geography: - Simple to investigate, set up, and changes. - Just those hubs are influenced, that has fizzled. Different hubs actually work. - Quick execution with few hubs and extremely low network traffic. - In Star geography, expansion, cancellation, and moving of the gadgets are simple. Here are the cons/downsides of utilizing Star: - In the event that the Hub or concentrator fizzles, appended hubs are handicapped. - The expense of the establishment of star geography is exorbitant. - Hefty network traffic can now and again sluggish the transport significantly. - Execution relies upon the Hub's ability - A harmed link or absence of an appropriate end may cut the network down.

128

What are the Main Differences Between Routers and Switches?

Reference answer

Routers operate at the network layer, addressing and routing based on IP addresses, while switches work at the data link layer, forwarding based on MAC addresses. Routers connect different networks, while switches enable communication within the same network.

129

What are your weaknesses, and how are you addressing them?

Reference answer

This question evaluates self-awareness and a candidate's proactive approach to professional development.

130

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

Reference answer

Parameters Include: SSID, RF, Channel authentication method.

131

What is a Security Operations Center (SOC)?

Reference answer

A Security Operations Center (SOC) monitors, detects, and responds to security incidents. It analyzes security alerts and logs in real-time, coordinates with incident response teams, and uses threat intelligence to proactively defend against attacks, enhancing incident detection and response.

132

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

Reference answer

- Wireless network: Typically uses a single access point for connectivity. - Wireless mesh network: Uses multiple access points that connect to each other wirelessly, forming a self-healing network.

133

What is the significance of AP mode in wireless networks?

Reference answer

AP mode (Access Point mode) allows a wireless device to function as an access point, providing wireless connectivity to clients and extending the network. It is commonly used to bridge wired networks with wireless clients.

134

Can you define the OSI model?

Reference answer

The OSI (Open System Interconnection) is a reference model that has the necessary protocols and standards for communicating over a network. The model was made by the International Organization for Standardization (ISO) in 1984. It consists of seven layers, where each layer has a different function. These layers are Physical Layer, Data Link Layer, Network Layer, Transport Layer, Session Layer, Presentation Layer, and Application Layer.

135

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

Reference answer

- Wireless network: Typically uses Wi-Fi for short-range connections within a building or small area. - Mobile network: Uses cellular technology for long-range connections over a wide geographical area.

136

What is the difference between a public and private IP address?

Reference answer

Public IP addresses are used for communication over the internet and are globally unique. They are assigned to your network by your Internet Service Provider (ISP). Private IP addresses are used within a private network, such as your home or office network. These addresses are not unique globally, and are not directly routable over the internet. Think of it this way: a public IP is like your postal address, allowing anyone to send you mail (data). A private IP is like an internal office extension; you can call someone within your office, but someone outside needs the main office number (public IP) to reach the office first.

137

What is a subnet mask?

Reference answer

A subnet mask is used in conjunction with an IP address to determine the network portion and the host portion of the address. It helps identify which devices belong to the same network segment.

138

A host, configured to receive its IP address automatically, needs to keep its IP address. What message is sent by the host to the DHCP server to accomplish this?

Reference answer

DHCP Request

139

Which frame has security information?

Reference answer

Beacon, Probe Response, Assoc Req, Re-association Req, 11r Re-association response

140

Explain the difference between a firewall and an IDS (Intrusion Detection System).

Reference answer

A firewall is a network security device that acts as a barrier between a trusted internal network and an untrusted external network, controlling incoming and outgoing traffic based on predefined rules. In contrast, an IDS is a system that monitors network traffic for suspicious activities or potential security threats. While a firewall prevents unauthorized access, an IDS detects and alerts on unusual network behavior, helping security teams respond to potential breaches. Example: A firewall might block incoming requests to a company's internal network, except for approved services like email and web browsing, to shield against malicious attacks.

141

What is 10Base2?

Reference answer

10Base2 defines the data transfer rate, i.e., 10Mbps, where Base is the "Baseband" and T defines the cable type. The IEEE 802.3a standard defines 10Base2, which includes data transmission rates of 10Mbps and a maximum segment length of 185 meters through the utilization of RG-58 coaxial cable. The 10Base2 protocol is characterized by a physical bus topology and employs BNC connectors that are equipped with 50-ohm terminators at both ends of the cable. It is necessary to ground one of the physical ends of every segment.

142

Describe the different types of wireless network protocols.

Reference answer

Common wireless network protocols include: - IEEE 802.11 (Wi-Fi): The most widely used protocol for WLANs, defining standards for wireless communication. - Bluetooth: Used for short-range, low-power connections between devices, typically for personal area networks (PANs). - Zigbee: A low-power, wireless protocol designed for home automation and industrial applications. - Z-Wave: A similar protocol to Zigbee, primarily used for home automation.

143

What is Endpoint Security?

Reference answer

Endpoint Security focuses on protecting individual devices connected to a network. It involves using antivirus software, firewalls, and intrusion prevention systems on endpoints to prevent malware infections and unauthorized access, enhancing the overall network security.

144

Do you have any questions for me?

Reference answer

This is typically asked at the end of the interview to gauge the candidate's engagement and curiosity about the role and company.

145

What is SD-WAN?

Reference answer

SD-WAN stands for Software-Defined Wide Area Network. It is a solution based on SDN architecture for simplifying WAN management. It separates the control and data planes to optimize application performance and reduce costs.

146

What is FlexConnect in Cisco Wireless?

Reference answer

FlexConnect: Enables branch office APs to be managed from a central location, allowing local client data switching and authentication. FlexConnect (previously known as Hybrid Remote Edge Access Point or H-REAP) is a wireless solution for branch office and remote office deployments. It enables you to configure and control access points in a branch or remote office from the corporate office through a wide area network (WAN) link without the deployment of a controller in each office. The FlexConnect access points (APs) can switch client data traffic locally and perform client authentication locally. When they are connected to the controller, they can also send traffic back to the controller.

147

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

Reference answer

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

148

What is a VPN and how does it work?

Reference answer

A VPN (Virtual Private Network) creates a secure, encrypted connection over the internet between a user's device and a remote server. This tunnel encrypts data, ensuring privacy and security. VPNs are used to protect sensitive data, provide remote access to corporate networks, and mask user IP addresses to maintain anonymity online.

149

What are some common network monitoring tools and their key features?

Reference answer

Expect candidates to mention software like SolarWinds, PRTG, and Nagios. Some key features they might talk about are: Network monitoring; Performance analysis; Traffic flow analysis; Alerting systems.

150

What is the TCP/IP model?

Reference answer

The TCP/IP model, also known as the Internet Protocol Suite, is a set of rules that govern Internet activity and facilitate completion of a variety of tasks on the network. It was developed prior to the OSI model, with the primary goal of enabling communication over diverse networks. The model is named after two of its most important protocols: Transmission Control Protocol (TCP) and Internet Protocol (IP). It's usually described in four layers, although some versions add a fifth. From bottom to top, we have the Network Interface layer, which is responsible for transmitting data over the network hardware; the Internet layer, which connects local networks, allowing them to communicate with each other via IP; the Transport layer (where TCP comes in), which provides communication between processes; and finally, the Application layer, where high-level data exchange among applications occurs. So, in a nutshell, the TCP/IP model is the basic framework that allows different systems to communicate and exchange data over the internet. TCP/IP truly is the backbone of modern internet communication.

151

Explain the difference between TCP and UDP.

Reference answer

TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are both protocols used for sending data over the internet, but they differ in their approach. TCP is connection-oriented, meaning it establishes a connection before sending data, ensures reliable delivery using acknowledgements and retransmissions, and provides ordered delivery. UDP, on the other hand, is connectionless; it sends data without establishing a connection first, offering faster transmission speeds but without guaranteed delivery or order. In summary, TCP is reliable but slower, suitable for applications like web browsing and file transfer where data integrity is paramount. UDP is faster but unreliable, making it suitable for applications like streaming and online gaming where speed is more important than perfect data delivery.

152

Which devices can interfere with wireless network operation?

Reference answer

Interfering Devices: Microwave ovens, cordless phones.

153

What is the difference between HTTP and HTTPS?

Reference answer

HTTP (HyperText Transfer Protocol) is a protocol used for transmitting data over the web. HTTPS (HTTP Secure) is an extension of HTTP that uses encryption (SSL/TLS) to secure data transmission between a web server and a browser. HTTPS ensures that data is encrypted and secure from eavesdropping and tampering.

154

What is 127.0.0.1?

Reference answer

The IP address 127.0.0.1 is a reserved address that is used for localhost connections. It is a special IPv4 address that is also called a loopback address. It is not a real IP address but all systems have this address which means “this computer”. During any connection issues, the server is pinged to check whether it is responding with the help of this address. The address is only used by the computer you are currently working on.

155

What is a wireless network adapter?

Reference answer

A wireless network adapter is a device that allows a computer or other device to connect to a wireless network. It typically includes an internal or external component that receives and transmits radio signals.

156

Tell me about yourself. How would you describe yourself as a person?

Reference answer

This is a conversational question to understand the candidate's personality and overall fit for the team.

157

What is the difference between a hub and a switch?

Reference answer

A hub operates at Layer 1 (the physical layer) of the OSI model, simply forwarding all received data to every connected device. This creates a collision domain where devices must contend for bandwidth, leading to potential inefficiencies, especially in busy networks. In contrast, a switch operates at Layer 2 (the data link layer) and intelligently forwards data only to the intended recipient based on MAC addresses. This creates separate collision domains for each port, significantly reducing collisions and improving network performance. Switches learn which MAC addresses are connected to which ports and build a switching table to facilitate targeted data transmission.

158

What is anonymous FTP?

Reference answer

It is used to allow users to receive files on a public server. In other words, Anonymous FTP allows users to get data into these servers without having to verify themselves but rather by logging in as anonymous guests.

159

What is a VPN?

Reference answer

Virtual Private Network (VPN) is used to set up private connections over unsecured networks such as the internet. VPNs protect users' privacy and security by encrypting data during transit between their device and the VPN server. This encryption mechanism renders intercepted data indecipherable, thus fortifying protection against potential breaches.

160

What are the different types of Networks?

Reference answer

Prominent types of networks include the following: a) Local Area Network (LAN): LANs represent localised network infrastructures confined to a limited geographic area, typically encompassing a single building or campus environment. LANs enable fast communication and resource sharing among devices, promoting collaboration and productivity within organisational premises due to low latency. b) Wide Area Network (WAN): WANs span expansive geographic regions, interconnecting disparate LANs and remote locations via telecommunications or internet-based communication channels. WANs enable interoffice communication and global resource access through diverse network architectures, from leased lines to modern MPLS and VPNs. c) Metropolitan Area Network (MAN): MANs bridge the gap between LANs and WANs, encompassing network infrastructures serving metropolitan or citywide regions. MANs enable efficient data transmission and resource sharing across urban areas, meeting diverse organisational and municipal needs with high-speed fibre optic links. d) Wireless Networks: Wireless networks utilise radio frequency (RF) communication protocols to facilitate wireless connectivity and mobility within networked environments. WLANs offer flexible connectivity in limited areas, while cellular networks provide widespread coverage, enabling seamless connectivity and mobile service access. e) Virtual Private Network (VPN): VPNs are encrypted channels over public networks, like the internet, allowing remote users to access organisational resources from anywhere. By leveraging VPN technologies, organisations can ensure data privacy, integrity, and confidentiality while facilitating seamless remote connectivity and collaboration. f) Cloud Networks: Cloud networks encompass virtualised network infrastructures deployed within cloud computing environments, enabling on-demand resource provisioning, scalability, and accessibility. Using cloud Networking technologies like VPCs and SDN, organisations create resilient, elastic network architectures to adapt to changing business needs.

161

Describe your experience with implementing and managing IDS/IPS solutions.

Reference answer

I have experience with implementing and managing both signature-based and anomaly-based IDS/IPS solutions, primarily using Snort and Suricata on Linux-based systems. My responsibilities included installing, configuring, and fine-tuning these systems to detect and prevent malicious network activity. This involved creating and customizing rule sets to identify specific attack signatures, as well as establishing baselines for normal network behavior to detect anomalies. Specifically, I worked on integrating these systems with SIEM solutions like Splunk for centralized log management and analysis. I also performed regular updates to the rule sets and software to ensure they were effective against the latest threats. A key part of my role was analyzing alerts, distinguishing between false positives and genuine threats, and taking appropriate remediation steps, such as blocking malicious IP addresses or isolating infected systems. In one instance, I used Snort rules to identify and block a series of SQL injection attempts against a web server, preventing a potential data breach.

162

What are the elements of a network director?

Reference answer

A network chairman has numerous duties that can be summed up into three key capacities: the establishment of a network, an arrangement of network settings, and upkeep/investigating of networks.

163

What is a MAC Address?

Reference answer

A MAC (Media Access Control) address is a 48-bit physical identifier assigned to a NIC. It operates at Layer 2 and ensures that data reaches the correct device in a local network.

164

What is your experience with implementing an SSO feature?

Reference answer

This question evaluates the candidate's experience with Single Sign-On (SSO) integration in wireless network environments.

165

What are common bottlenecks in network optimization, and how do you address them?

Reference answer

Common bottlenecks include insufficient bandwidth, high latency, and underperforming devices. Solutions include increasing bandwidth, optimizing network topology, and upgrading network equipment to enhance transmission efficiency and performance.

166

What is a VLAN and what are its benefits?

Reference answer

A VLAN, or Virtual Local Area Network, is a logical grouping of network devices that can be located anywhere but communicate like they're all on the same physical network. It's kind of like creating smaller, virtual networks within a larger network. The main purpose of a VLAN is to enhance network performance and security. By dividing a large network into smaller VLANs, you can help reduce network congestion, as the traffic is only switched between the devices within the same VLAN, not across the entire network. Another significant advantage is security. Data broadcasted within a VLAN is only propagated to devices that are part of that VLAN, reducing the chances of sensitive data being accessed by unauthorized devices. Moreover, VLANs increase flexibility as they aren't bounded to a single physical location. Devices can be part of the same VLAN no matter where they're located, as long as they are on the same network infrastructure. So, it simplifies network management tasks like adding, moving, or changing configurations.

167

Which type of DNS query requires the DNS server to respond with either the requested resource record or an error message stating that the record could not be found?

Reference answer

Recursive query

168

What is the difference between Independent Basic Service Set (IBSS) and Basic Service Set (BSS) in wireless networking?

Reference answer

Wireless networks can be established either as an Independent Basic Service Set (IBSS) which allows direct communication between devices without an access point, or a Basic Service Set (BSS) which uses a central access point to control access and connectivity for wireless devices on the network.

169

What is the significance of using channel width in wireless networks?

Reference answer

Channel width affects the data rate and bandwidth of a wireless network. Wider channels (e.g., 40 MHz, 80 MHz) provide higher throughput but can also increase interference. Properly selecting channel width helps balance performance and interference.

170

What is a Zone-based Firewall?

Reference answer

A Zone-based Firewall divides network segments into zones and controls traffic flow according to specified security policies. It improves Network Security by managing traffic between zones. It offers precise control, and segmentation to prevent illegal entry and threats.

171

What is a private IP address?

Reference answer

A private IP address is for internal networks and is not accessible from the internet. It follows specific address ranges for local communication, creating isolated networks shielded from external access.

172

What are the differences between 802.11a, 802.11b, 802.11g, and 802.11n?

Reference answer

The differences are: - 802.11a: Operates at 5 GHz, has 23 channels, data rate up to 54 Mbit. - 802.11b: Operates at 2.4 GHz, has 3 channels, data rate up to 11 Mbit. - 802.11g: Operates at 2.4 GHz, has 3 channels, data rate up to 54 Mbit. - 802.11n: Operates at 2.4 GHz and 5 GHz, channel count depends, data rate up to 300-600 Mbit.

173

What do you understand by MAC address?

Reference answer

A Media Access Control (MAC) address is a unique hardware identifier for network interfaces, like network cards. It's expressed in alphanumeric characters and remains fixed. MAC addresses ensure devices are distinguishable in networks, aiding data packet delivery. These are immutable and vital for tasks like Ethernet frame forwarding and device identification in network communication.

174

What is a wireless bridge mode?

Reference answer

Wireless bridge mode connects two or more wired or wireless networks over a wireless link. It allows devices on separate networks to communicate with each other.

175

What is internetworking?

Reference answer

Internetworking is a combination of two words, inter and networking which implies an association between totally different nodes or segments. This connection area unit is established through intercessor devices akin to routers or gateways. The first term for the associate degree internetwork was interconnected. This interconnection is often among or between public, private, commercial, industrial, or governmental networks. Thus, associate degree internetwork could be an assortment of individual networks, connected by intermediate networking devices, that function as one giant network. Internetworking refers to the trade, products, and procedures that meet the challenge of making and administering Internet works.

176

What are the challenges of managing a hybrid cloud network and how would you address them?

Reference answer

Managing a hybrid cloud network presents several challenges. Consistency in security policies, network configurations, and monitoring across on-premises and cloud environments is crucial but difficult to achieve. Different cloud providers offer varied services and APIs, leading to integration complexities and potential vendor lock-in. Network latency and bandwidth limitations between the on-premises data center and the cloud can impact application performance. Data governance and compliance requirements become more complex when data resides in multiple locations. To address these, I would implement a few strategies. Employing infrastructure-as-code (IaC) tools to automate network provisioning and configuration management ensures consistency. Utilizing a centralized monitoring and logging solution provides visibility across the entire hybrid environment. Implementing robust security measures, like network segmentation and encryption, is crucial to protect data in transit and at rest. Choosing a hybrid cloud management platform helps streamline operations and manage resources across different cloud providers and on-premise infrastructure.

177

What is a VPN and what are the different types?

Reference answer

VPN (Virtual Private Network) technology creates a secure, encrypted connection over a less secure network, like the internet. It essentially tunnels your internet traffic through a server operated by the VPN provider. This masks your IP address, encrypts your data, and makes it appear as if you're browsing from the VPN server's location. This enhances privacy and security, especially on public Wi-Fi. Different types of VPNs exist, including: - Remote Access VPN: Connects individual users to a corporate network from remote locations. - Site-to-Site VPN: Connects entire networks together, such as a branch office to the main office. - Client-based VPN: Requires software installed on the user's device. - SSL/TLS VPN: Uses a web browser to create a secure connection without dedicated client software.

178

What is background scan?

Reference answer

♣ When STA is connected to AP and STA wants to scan, the STA sends null frame with PM=1 to AP. Then STA does Active/Passive scan on other channel. Then STA comes back to original channel [Connected AP channel] and sends null frame with PM=0 to AP. Example: This type of scan observed at the time of Roaming.

179

What is a firewall and how does it work?

Reference answer

A firewall acts like a security guard between networks, deciding which traffic to allow through and which to block. It's essentially a barrier designed to prevent unauthorized access to or from a private network, usually your personal or organizational network. Firewalls can be hardware, software, or a combination of both. They use predefined rules to filter traffic based on criteria like IP addresses, domain names, protocols, programs, or ports. For example, if an incoming packet's IP is from a known malicious source, it will be blocked. Apart from blocking unwanted traffic, firewalls also offer services like logging and auditing. This can be helpful in understanding patterns, detecting inconsistencies, and tracking suspicious activity. In essence, the role of a firewall in networking is to maintain a secure environment by enforcing access policies and providing a line of defense against different types of attacks.

180

What is IP Spoofing?

Reference answer

IP Spoofing is essentially a technique used by hackers to gain unauthorized access to Computers. Concepts of IP Spoofing were initially discussed in academic circles as early as 1980. IP Spoofing types of attacks had been known to Security experts on the theoretical level. It was primarily theoretical until Robert Morris discovered a security weakness in the TCP protocol known as sequence prediction. Occasionally IP spoofing is done to mask the origins of a Dos attack. In fact, Dos attacks often mask the actual IP addresses from where the attack has originated from.

181

How does a wireless controller manage multiple access points?

Reference answer

A wireless controller centralizes the management of multiple access points, allowing for streamlined configuration, monitoring, and optimization. It handles tasks such as firmware updates, channel planning, load balancing, and security enforcement.

182

What is a subnet mask and why is it important?

Reference answer

A subnet mask is a number that defines how much of an IP address is allocated to the network, and how much is available for host devices. It's primarily used for dividing an IP address into a network and host address in a practice called subnetting. The importance of a subnet mask in networking is manifold. One of the main purposes is to improve the efficiency and speed of the network. By breaking a network into smaller subnetworks, locally transmitted data can stay within a particular subnet, reducing unwanted traffic on other subnets. This helps enhance network performance by limiting the chances of network collisions. Subnet masks also play a crucial role in IP routing, where they are used to determine whether the destination of a packet is within the same subnet or if it needs to be sent to a different subnet via a router. Moreover, subnetting increases the number of available IP addresses and improves network security by segregating different parts of a network. So, essentially, subnet masks are a key tool for organizing, managing, and securing your network resources efficiently.

183

What is a highlight point interface?

Reference answer

It alludes to an immediate association between two PCs on a network. A highlight point association needn't bother with some other network gadget other than interfacing a link to the NIC cards of the two PCs.

184

What is the function of WLAN on WLC?

Reference answer

WLAN: Similar to SSID, required for client association with the network.

185

What is the importance of APIPA in networking?

Reference answer

APIPA stands for Automatic Private IP Addressing. This is an important feature of Windows systems that allow the device to assign an IP address to itself when there is no DHCP. This IP address has a range of 169.254.0.1 through 169.254.255.254. Any client system can use this APIPA address until the DHCP server is available. This facility is commonly used for small organizations having about 25 clients.

186

What is the difference between a wireless network and a wired network in terms of security?

Reference answer

- Wireless network: More susceptible to unauthorized access and eavesdropping due to the open nature of radio waves. - Wired network: Generally more secure because data transmission is confined to physical cables.

187

Define different types of network topology

Reference answer

The different types of network topology are given below: Bus Topology: - All the nodes are connected using the central link known as the bus. - It is useful to connect a smaller number of devices. - If the main cable gets damaged, it will damage the whole network. Star Topology: - All the nodes are connected to one single node known as the central node. - It is more robust. - If the central node fails the complete network is damaged. - Easy to troubleshoot. - Mainly used in home and office networks. Ring Topology: - Each node is connected to exactly two nodes forming a ring structure - If one of the nodes are damaged, it will damage the whole network - It is used very rarely as it is expensive and hard to install and manage Mesh Topology: - Each node is connected to one or many nodes. - It is robust as failure in one link only disconnects that node. - It is rarely used and installation and management are difficult. Tree Topology: - A combination of star and bus topology also know as an extended bus topology. - All the smaller star networks are connected to a single bus. - If the main bus fails, the whole network is damaged. Hybrid: - It is a combination of different topologies to form a new topology. - It helps to ignore the drawback of a particular topology and helps to pick the strengths from other.

188

What is meant by Threat, Vulnerability, and Risk?

Reference answer

Threats: A Threat signifies potential harm that could compromise organisational assets, including confidentiality, integrity, or availability of information systems. Threats include the following: These can potentially pose harm or disruption to systems and networks. Vulnerability: A vulnerability is a weakness in a system or process that could be exploited by threat actors to compromise security. Vulnerabilities encompass software vulnerabilities, hardware vulnerabilities, and human vulnerabilities, each posing distinct security risks to organisational assets. Risk: Risk denotes the potential for harm, loss, or adverse impact resulting from the intersection of threats, vulnerabilities, and organisational assets. Risk embodies the likelihood and magnitude of potential security incidents occurring within an organisational context, as well as operational, reputational, and regulatory ramifications.

189

What are some of the benefits of Wi-Fi 6 over previous Wi-Fi standards?

Reference answer

Benefits include: - Higher speeds and throughput. - Improved efficiency and lower latency. - Better support for multiple devices. - Enhanced security features.

190

How do you keep your skills and knowledge up to date in network analysis?

Reference answer

I regularly read networking blogs like PacketLife and follow forums like Spiceworks for the latest updates. I recently completed a course on network security via Coursera and plan to attend the upcoming Cisco Live conference. I believe staying informed not only enhances my technical skills but also enables me to contribute effectively to my team.

191

Major differences between Cisco 2500 Series and 5500 Wireless Controllers?

Reference answer

Cisco 2500 vs 5500: 5500 supports more APs and clients, offers higher throughput, and advanced features compared to 2500.

192

How would you describe what anonymous FTP is?

Reference answer

Our final type of more technical network engineer interview question you could be asked can be answered straightforwardly, allowing the interviewer to evaluate your network engineering expertise. Hereâ€™s how weâ€™d advise answering technical types of network engineer interview questions like this: â€œAnonymous FTP provides a method for granting users access to files on public servers. Those permitted to access data from these servers can do so without the need for personal identification, but instead theyâ€™ll log in as anonymous guests.â€

193

Please can you define what DNS means?

Reference answer

Hereâ€™s how to answer another type of network engineer interview question an interviewer could ask to support their judgement of your technical know-how. â€œThe Domain Name System, commonly known as DNS, serves as a network service primarily responsible for converting host names into TCP/IP addresses for seamless address resolution.â€

194

What is the importance of burrow mode?

Reference answer

This is a method of information trade wherein two conveying PCs don't utilize IPsec themselves. All things considered; the passage that is associating their LANs to the travel network makes a virtual passage. Thus, it utilizes the IPsec convention to get all correspondence that goes through it.

195

What are the advantages of wireless communication over wired communication?

Reference answer

Wireless communication offers mobility, ease of installation, scalability, and lower infrastructure costs compared to wired communication. It enables connectivity in remote or difficult-to-wire locations and supports flexible network topologies.

196

Can you explain what a VLAN is and its purpose?

Reference answer

A VLAN (Virtual Local Area Network) is a logical grouping of devices within a single Ethernet network segment. It helps reduce the number of broadcast domains and network subnets, allowing multiple networks to share the same physical infrastructure without interference.

197

What's your experience with RF propagation and/or interference?

Reference answer

This question tests the candidate's understanding of how radio waves behave in different environments and how to mitigate interference.

198

What are some AngularJS interview questions for fresher and senior rounds?

Reference answer

AngularJS interview questions for fresher and senior rounds, with sharp answers on scope, digest cycles, directives, routing, dependency injection, testing.

199

How do you set up alerts for network issues?

Reference answer

To set up alerts for network issues, network engineers typically use network management software to define thresholds for key performance indicators like bandwidth usage, latency, and error rates. When thresholds are breached, the software triggers alerts via email, SMS, or dashboard notifications.

200

What is DHCP and why is it important?

Reference answer

The Dynamic Host Configuration Protocol, or DHCP, is a network management protocol used to automate the process of configuring devices on IP networks. Essentially, it's like a real estate agent for your network, handing out IP addresses to devices so they know where to live on the network. When a device connects to a network, it sends a request for an IP address. DHCP steps in, checks for available IP addresses in its pool, and assigns one to the device. Not only that, but it also provides additional network configuration info like the subnet mask, default gateway, and DNS servers. What makes DHCP significant is that it greatly simplifies network management. Without DHCP, network administrators would have to manually assign IP addresses and configuration settings to each device—imagine doing that for a large network with hundreds or thousands of devices. That's not only time-consuming but also prone to errors like IP conflicts. So, DHCP is a real time-saver and error-preventer in network management.

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