Best Wireless Network Analyst Interview Prep Questions

1

What is a MAC address and how does it differ from an IP address?

Reference answer

A MAC (Media Access Control) address is a unique identifier assigned to a network interface controller (NIC) for communication within a network segment. It's like a physical address burned into the hardware. Its primary purpose is to enable communication between devices on the same local network. An IP (Internet Protocol) address, on the other hand, is a logical address used to identify a device on an IP network, enabling communication across different networks, including the internet. The key difference lies in their scope and function. MAC addresses handle local network communication (layer 2 in the OSI model), while IP addresses handle communication across networks (layer 3). MAC addresses are permanent and hardware-specific, while IP addresses can be dynamically assigned and change depending on the network the device is connected to. Think of MAC as identifying you in your apartment building and IP as identifying your apartment building in the world.

2

What is STP (Spanning Tree Protocol)?

Reference answer

STP prevents switching loops by blocking redundant paths. It selects a Root Bridge and uses bridge IDs and path costs to maintain a loop-free topology. Modern variants include: - RSTP (Rapid STP) - MSTP (Multiple STP)

3

Explain the concept of roaming in wireless networking.

Reference answer

Roaming allows wireless devices to seamlessly switch between access points as they move around within a network. It maintains connectivity and prevents dropped connections when users move out of range of one WAP and into the range of another.

4

What is MIMO (Multiple-Input Multiple-Output) technology?

Reference answer

MIMO is a technology that uses multiple antennas for both transmission and reception. It allows for faster data rates, better range, and improved reliability by utilizing multiple signal paths.

5

What is load balancing in networking?

Reference answer

Load balancing in networking is the process of distributing network traffic across multiple servers or paths to ensure no single server or path gets overwhelmed. This can optimize responsiveness and increase the availability of applications. At its core, a load balancer sits between client devices and the backend servers. When a client makes a request, the load balancer uses an algorithm to determine which server is best suited to handle the request, based on factors like server availability, current load, and response times. Then, it forwards the client's request to that selected server. There are various load balancing algorithms, and the choice of which to use depends on the specific needs of the network. For example, a round robin algorithm cycles through all servers in order, while a least connections algorithm gives the request to the server with the fewest active connections. Apart from ensuring efficient use of resources and preventing server overload, load balancers can also provide failover capabilities. If a server goes down, the load balancer can automatically redirect its traffic to the remaining operational servers, enhancing network reliability and availability.

6

Which layer of the OSI model is responsible for segmenting data into smaller packets for transmission?

Reference answer

Transport Layer (Layer 4)

7

What is a router?

Reference answer

A router is a physical device that is used for receiving, storing, analyzing and forwarding data packets to other nodes inside or outside the network. Routers can connect to devices such as a modem, optic fiber and a cable to connect and share information between devices. Routers contain firmware and software. Firewalls are installed in routers for securing the network. Moreover, routers use forwarding tables and headers for determining the best path for transferring the data packets.

8

What is a Source Route?

Reference answer

A Source Route is a predefined path that specifies the sequence of intermediate network devices a data packet should follow to reach its destination. This path is determined by the sender and is included in the packet headers to guide its transmission through the network.

9

What is CGMP(Cisco Group Management Protocol)?

Reference answer

CGMP is a simple protocol, the routers are the only devices that are producing CGMP messages. The switches only listen to these messages and act upon them. CGMP uses a well-known destination MAC address (0100.0cdd.dddd) for all its messages. When switches receive frames with this destination address, they flood it on all their interfaces Bluetooth so all switches in the network will receive CGMP messages. Within a CGMP message, the two most important items are: - Group Destination Address (GDA) - Unicast Source Address (USA) The group destination address is the multicast group MAC address, and a unicast source address is the MAC address of the host (receiver).

10

What scripting languages are commonly used for network automation and what are their advantages?

Reference answer

Expect candidates to mention languages such as Python, Bash, and PowerShell and talk about their advantages: Python has extensive libraries and ease of use; Bash is excellent for automating Unix-based systems; PowerShell is ideal for Windows environments.

11

What is Subnetting, and Why Is It Important?

Reference answer

Subnetting divides a large IP network into smaller, logical sub-networks. Benefits: - Improves performance by reducing broadcast domains. - Enhances network security and management. - Optimizes IP address allocation. Example: If a company has 192.168.1.0/24 , it can be divided into 4 subnets of /26 each, providing better segmentation per department.

12

What is Sneakernet?

Reference answer

Sneakernet is believed to be the earliest form of networking where data is physically transferred using removable media, such as a disk or tapes.

13

What is the minimum size of the icmpV4 packet what is the maximum size of the icmpv4 packet?

Reference answer

- Minimum size ICMPv4 packet = 28 bytes - Maximum size ICMPv4 packet = 2068 bytes

14

What are the key considerations when designing a network for a small business vs. a large enterprise?

Reference answer

Designing a network involves different considerations based on the size of the organization. For a small business, the focus is often on simplicity and cost-effectiveness. Key considerations include: budget, ease of setup and maintenance, security (firewall, password protection), scalability for future growth, and reliable internet access. Choosing appropriate hardware like routers, switches, and Wi-Fi access points is crucial. A simple network topology, perhaps a flat network or a small VLAN setup, is usually sufficient. Backup and disaster recovery, and cloud integration for cost savings, are also important. For a large enterprise, the network design is far more complex. Scalability, security, reliability, and performance are paramount. Considerations include: high bandwidth and low latency, redundancy and failover mechanisms, advanced security measures (intrusion detection/prevention systems, access control lists), network segmentation (VLANs, subnets), centralized management and monitoring tools, and compliance requirements. Enterprise networks often employ sophisticated technologies like software-defined networking (SDN), network automation, and cloud-based services. Security is a constant consideration, including regular penetration testing and security audits.

15

What is a VPN and how does it work?

Reference answer

A VPN, or Virtual Private Network, amplifies your internet privacy by creating a private network from a public internet connection. When you send data over the internet, typically that data can go through several different servers before it reaches its destination, which can expose it to interception or monitoring. With a VPN, however, your data is encrypted and sent to a specific VPN server before it's sent to its final destination. The VPN server acts as a sort of middleman. When you send a request, that request goes to the VPN server, which then sends the request on your behalf. The response also comes back to the VPN server first and then goes to you. This means to anyone monitoring network traffic, it looks like all your data is just going between you and the VPN server. This process enhances your privacy online because it masks your IP address, making it more difficult for others to track your online activities. Additionally, since the VPN server can be located anywhere in the world, you can appear to be browsing from that location, which can bypass regional restrictions on content. As a result, VPNs are crucial for preserving privacy, especially when using public Wi-Fi networks.

16

What is the difference between Active scanning and Passive scanning?

Reference answer

Passive scanning: Its the process where the client (STA) listens (on different channels) to the beacons from the AP or Ad Hoc station. The STA continues to listen to the beacons till its hears a beacon with the SSID of the network it wishes to join. Active scanning: This involves the STA sending a probe request frame. The station sends the probe request frame when it is actively trying to join a specific SSID (network). The probe request frame will either contain the SSID name of the network or a broadcast SSID. If probe request is sent specifying a specific SSID, then only the APs serving the SSID will respond with a probe response frame. If probe request is sent with broadcast SSID then all APs within reach will respond.

17

What is the main purpose of a DNS server?

Reference answer

DNS stands for Domain Name Server. It translates Internet domains and hostnames to IP addresses and vice versa. DNS technology allows typing names into your Web browsers and your computer to automatically find that address on the Internet. A key element of the DNS is a worldwide collection of DNS servers. It has the responsibility of assigning domain names and mapping those names to Internet resources by designating an authoritativename server for each domain. The Internet maintains two main namespaces like Domain Name hierarchy and Internet protocol address space.

18

How do tunnels work in network communication?

Reference answer

Tunnels create a virtual passage for data exchange between two communicating computers without using IPsec themselves. The gateway connecting their LANs to the transit network creates a virtual tunnel and uses the IPsec protocol to secure all communication passing through it.

19

What is the difference between a static IP address and a dynamic IP address?

Reference answer

- Static IP address: Assigned manually and remains the same, suitable for servers and other devices that need a fixed address. - Dynamic IP address: Assigned automatically by a DHCP server and can change over time, commonly used for client devices.

20

How do you view the application of network automation and AI in network management?

Reference answer

Network automation leverages scripts and tools to automate device configuration and management, increasing efficiency and accuracy. AI uses machine learning and big data analysis to predict traffic patterns, analyze user behavior, and assist in optimization and troubleshooting, providing strong support for future network management.

21

What is a Virtual Private Network (VPN)?

Reference answer

A Virtual Private Network(VPN) creates a secure, encrypted connection over an untrusted network, like the Internet. It encrypts data in transit, ensuring that sensitive information remains confidential and protected from unauthorized access and tampering.

22

What is the difference between WLAN and WiMAX?

Reference answer

WLAN is used as a wireless local area network for providing connectivity between WLAN-compliant devices. WiMAX is used as a wide area network for providing access between various wireless devices. WLAN standards are evolving, including 11a, 11b, 11g, 11n, 11ac, 11ad, and more. WiMAX follows IEEE standards viz. 16d and 16e. Both use the OFDM modulation scheme.

23

What are the benefits of using a Network Monitoring System (NMS)?

Reference answer

There are many benefits to using a Network Monitoring System (NMS). It allows for proactive detection of possible troubles before they affect users by offering centralized monitoring of all network devices and performance measures. Capacity planning is made simpler by NMS, which monitors growth patterns and bandwidth usage. It makes thorough performance analysis possible in order to locate bottlenecks and that further effectiveness. NMS offers detailed logs and diagnostic data to help with faultfinding. Greater responsiveness and reduced maintenance are made possible by automated reporting for important events. Network visibility, dependability, and management effectiveness are ultimately enhanced by NMS.

24

What is a SIEM system?

Reference answer

SIEM systems gather and analyze log data from various network sources, providing a comprehensive view of security events. They correlate information and offer real-time alerts, aiding in the quick detection and response to security incidents and strengthening overall network security.

25

Explain SNMP.

Reference answer

Simple Network Management Protocol (SNMP) monitors network devices. - Versions: v1, v2c, v3 (with authentication/encryption). - Components: Manager, Agent, MIB (Management Information Base).

26

What is a wireless bridge?

Reference answer

A wireless bridge connects two or more wired or wireless networks over a wireless link. It extends the reach of a network or provides a wireless connection between two wired networks.

27

What is a packet in networking?

Reference answer

Imagine sending a package through the mail. In networking, a 'packet' is like that package. It's a small bundle of data that's being sent across a network. Just like a physical package needs an address to arrive at the right place, a packet contains information like the sender's and receiver's IP addresses (like a postal address) and other control information. The actual data being transmitted is like the contents of the package. Similar to how a large item is broken down into smaller boxes for easier shipping, large files or data streams are split into multiple packets. Each packet is then sent independently and reassembled at the destination. This allows for efficient and reliable data transfer, especially across networks with varying capacities or potential disruptions.

28

How do you approach collaboration with cross-functional teams for network projects?

Reference answer

Assessment: Critique the potential hire's communication skills, teamwork abilities, and capacity to collaborate effectively with individuals from diverse backgrounds. Red flags: Difficulty in describing past collaborative experiences or negative attitudes towards teamwork may suggest poor interpersonal skills or an inability to work in a team environment.

29

What is an Anycast address?

Reference answer

Anycast address is a single IP address utilized by a set of servers at different sites. When one directs any request to an Anycast address, the address is redirected to the nearest server. This will improve the speed and consistency of network services since the distance the information needs to travel is reduced. It is also able to help manage heavy traffic at the same time. How it works: - The same IP address is used for many servers. - The network finds the closest server to you. - Your request is sent to that server automatically. - If one server fails, traffic is redirected to the next closest server.

30

Which of the following statements best describes the primary function of the Address Resolution Protocol (ARP)?

Reference answer

To resolve IP addresses to MAC addresses

31

What are the common network topologies and their advantages/disadvantages?

Reference answer

Common network topologies include star, bus, ring, mesh, and tree. The star topology features all devices connected to a central hub or switch, offering easy management and fault isolation, but relies heavily on the central device. The bus topology uses a single cable (the bus) to which all devices are attached; it's simple and inexpensive to implement but susceptible to cable breaks and difficult to troubleshoot. The ring topology connects devices in a circular loop, with data traveling in one direction; it can offer high performance but a failure in one device can disrupt the entire network. The mesh topology provides multiple paths between devices, enhancing redundancy and reliability, but it's complex and expensive to implement, especially in large networks. Finally, the tree topology combines characteristics of star and bus topologies, forming a hierarchical structure; it's scalable and manageable but can be complex to configure and maintain. Choosing the right topology depends on factors like cost, scalability, reliability, and performance requirements.

32

What are the different ways to exchange data?

Reference answer

Data exchange methods include the following: a) Client-Server Communication: Client-server Communication entails the exchange of data between client devices and server systems hosting centralised resources, services, or applications. Client-server architectures utilise protocols like HTTP, HTTPS, FTP, and RPC for bi-directional data transmission, resource access, and service invocation between clients and servers. b) Node-to-node Networking: Node-to-node Networking facilitates direct data exchange and communication between individual networked nodes without the need for centralised servers or intermediaries. P2P protocols like BitTorrent, Gnutella, and Direct Connect enable decentralised data sharing among peer nodes, fostering resilience and scalability. c) Messaging Protocols: Messaging protocols encompass communication frameworks facilitating asynchronous data exchange and message transmission between distributed systems or applications. Messaging protocols like MQTT, AMQP, and JMS are tailored for specific paradigms such as publish-subscribe and point-to-point messaging. d) File Transfer Mechanisms: File transfer mechanisms enable the exchange of files, documents, or multimedia content between networked devices or users. Common file transfer protocols include FTP, SFTP, SCP, and TFTP, each offering different levels of security, reliability, and performance. e) Data Interchange Formats: Data interchange formats standardise the representation and encoding of structured data for transmission and interoperability across disparate systems and platforms. Data interchange formats like JSON, XML, CSV, and Protocol Buffers enable data exchange and serialisation within networked environments.

33

What does 5G NR (New Radio) entail?

Reference answer

5G NR, or New Radio, is the global standard for air interface communication in 5G networks. It brings a host of improvements over its predecessors, including higher data rates, lower latency, and increased reliability. 5G NR represents the latest advancement in wireless communication Technology, designed to deliver unprecedented speed and connectivity. It utilises advanced features like beamforming and massive MIMO to optimise data transfer, making it a pivotal element in the 5G ecosystem.

34

What are Honeypots?

Reference answer

Honeypots are decoy systems set up to attract and distract attackers from real network assets. Monitoring interactions with these decoys helps security professionals gather insights about potential threats, tactics, and vulnerabilities, improving defensive strategies.

35

What is WPA2 encryption and how does it differ from WPA?

Reference answer

The content describes WPA2 encryption, highlighting the use of AES and differences from WPA, but does not provide specific details in the given text.

36

What is latency?

Reference answer

Latency is the time it takes for data to make a round trip. We measure latency in milliseconds. A low number is good. A high number is bad. You send a message and wait for a response. The time you wait is referred to as latency. It is the time for a signal to travel to a server and then come back to you. When playing an online game, low latency is crucial. High latency causes lag. It makes the game feel slow. The same applies to video calls. High latency makes conversations difficult. It is not the same as speed. Speed, or bandwidth, is how much data you can move at once. Latency refers to the time it takes for any piece of data to travel. You can have a fast connection with bad latency. This would feel like a big highway with a long delay at a traffic light.

37

Explain Wireless Standards.

Reference answer

Common IEEE standards: - 802.11n: Up to 600 Mbps - 802.11ac: Gigabit Wi-Fi - 802.11ax (Wi-Fi 6): High efficiency, OFDMA, MU-MIMO

38

What Are Your Views on Cloud Computing and Virtualization?

Reference answer

Cloud computing provides scalable, on-demand virtual resources such as computing, storage, and networking. Virtualization is a core technology for cloud computing, enabling physical resources to be abstracted into virtual ones, improving efficiency and flexibility.

39

What are runts and giants in networking?

Reference answer

Runts are Ethernet frames that are smaller than the minimum allowed size of 64 bytes (excluding preamble), often caused by collisions or faulty hardware. Giants are frames that exceed the maximum allowed size of 1518 bytes (or 1522 bytes with VLAN tagging), typically due to misconfigured interfaces or hardware errors. Both indicate Layer 1 or Layer 2 issues and can be observed using 'show interfaces' command on Cisco devices.

40

What is the appropriate end rate for UTP links?

Reference answer

The appropriate end for an unshielded contorted pair network link is 100 ohms.

41

What is a wireless access point (WAP)?

Reference answer

A wireless access point (WAP) is a device that connects wireless devices to a wired network. It acts as a bridge between the wireless and wired environments, allowing devices to access the internet or other network resources.

42

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

Reference answer

The 2.4 GHz Wi-Fi frequency offers a broader range and better penetration through walls and obstacles but is more susceptible to interference from devices like microwaves and cordless phones. The 5 GHz frequency provides higher data rates and reduced interference, making it ideal for high-bandwidth activities like streaming and gaming but has a shorter range and less effective penetration through obstacles.

43

What is a VPN and how does it enhance security?

Reference answer

A Virtual Private Network (VPN) creates a secure and encrypted connection over a public network, such as the Internet. It enhances security by masking the user's IP address, encrypting data traffic, and allowing secure remote access to a private network.

44

How do antennas impact wireless communication performance?

Reference answer

Antennas convert electrical signals into electromagnetic waves and vice versa. Their gain, directivity, polarization, and bandwidth affect signal strength, coverage, and interference. Advanced techniques like MIMO (Multiple-Input Multiple-Output) use multiple antennas to improve throughput and reliability.

45

What is the principle of Least Privilege?

Reference answer

The principle of Least Privilege restricts user access to only what is necessary for their job. This reduces the attack surface, minimizes the impact of compromised accounts, and lowers the risk of unauthorized access or data breaches.

46

What is the difference between symmetric and asymmetric encryption?

Reference answer

| Feature | Symmetric Encryption | Asymmetric Encryption | |---|---|---| | Definition | Uses the same key for both encryption and decryption. | Uses a pair of keys: a public key for encryption and a private key for decryption. | | Key Type | Single key (shared secret key) | Two keys (public key and private key) | | Speed | Generally faster, as it requires less computational power. | Slower due to the complex mathematical operations involved. | | Security | Less secure if the shared key is intercepted. | More secure, as only the private key can decrypt data encrypted by the public key. | | Key Distribution | Difficult to distribute securely since both parties must share the same key. | Easier to distribute, as only the public key is shared openly. | | Example Algorithms | AES, DES, 3DES, RC4 | RSA, DSA, ECC | | Use Case | Typically used for encrypting large amounts of data, like files or disk encryption. | Used for secure key exchange, digital signatures, and securing small amounts of data. | | Overhead | Low overhead, efficient for bulk data encryption. | Higher overhead, suitable for small data like encryption of keys or messages. | | Scalability | Not easily scalable for large networks due to the need to manage multiple keys. | More scalable for large networks since only one public-private key pair is needed per user. |

47

What is the waiting time for each channel for Active and Passive scan?

Reference answer

Maximum and Minimum waiting time for each channel for scanning are defined by “MaxChannelTime[TU]” and “MinChannelTime[TU]” parameter respectively. Waiting time may vary from vendor to vendor implementation. For Active Scanning: MinChannelTime = 0.67 ms [MinChannelTime >= DIF S + CW ∗ aSlotT ime = 50 µsec + 31 * 20 µsec = 670 µsec = 0.67ms] MaxChannelTime = 15 ms For Passive Scanning : MinChannelTime will be > 100TU [As default beacon interval is 100TU for APs]

48

What is a firewall and why do we need it for network security?

Reference answer

A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between a trusted internal network and an untrusted external network, such as the internet. We need firewalls for network security to prevent unauthorized access to our systems and data. They help protect against various cyber threats, including: - Malware and viruses - Unauthorized access attempts - Denial-of-service (DoS) attacks - Data breaches

49

How would you handle a difficult situation with a client?

Reference answer

There may be occasions where a client you're supporting poses a difficult situation for you to deal with, perhaps when troubleshooting a network issue. In these scenarios, you may be under immense pressure to resolve the problem in a short amount of time and be faced with a frustrated client. By asking network engineer interview questions like this, the interviewer wants to know how you deal with a difficult situation like this. You could answer this question by giving a real-life experience you've had, but if not, we've provided an appropriate response you could give. "First, I would express empathy and sincerely apologise for the client's unfortunate experience. My next step would be to actively listen to their concerns, asking relevant questions to gain a deeper understanding of the situation. I'd maintain a composed and respectful demeanour, even in the face of the client's anger or frustration. I would take full responsibility for the situation, set realistic expectations and propose a solution that addresses the client's needs and preferences. After resolving the issue, I would follow up with the client to ensure they were satisfied with the resolution and implement measures to prevent similar incidents in the future. Taking this comprehensive approach aims to foster positive client relationships and reinforce the commitment to exceptional service.â€

50

What is DNS, and how does it work?

Reference answer

DNS (Domain Name System) is a system that translates human-friendly domain names (e.g., www.sprintzeal.com) into IP addresses that computers can understand. It works by using a hierarchical structure of DNS servers to look up and resolve domain names to their corresponding IP addresses. For instance, when you type "www.google.com" in your web browser, DNS servers are responsible for translating it into an IP address, like 172.217.168.100, so your computer can reach the correct web server.

51

What are the various methods of getting a PC network?

Reference answer

There are a few different ways to do this. Introduce a dependable and refreshed enemy of infection program on all PCs. Ensure firewalls are arrangement and designed effectively. Client validation will likewise help a ton. All these consolidated would make a profoundly got network.

52

How do you ensure network security?

Reference answer

Ensuring network security involves multiple steps such as implementing strong firewall rules, using intrusion detection and prevention systems, enforcing strict access controls, regularly updating software and firmware, and performing regular security audits and vulnerability assessments.

53

What is a network packet and why is it important?

Reference answer

A network packet is a small unit of data transmitted over a network. Each packet contains a portion of the data being sent, along with metadata such as the destination address. Packets are important because they enable efficient and organized data transmission over networks, allowing large amounts of data to be broken into manageable chunks for delivery.

54

How does GDPR impact network engineers?

Reference answer

GDPR (General Data Protection Regulation) strengthens data protection in the EU. Engineers must ensure networks comply with GDPR by implementing measures like data encryption, access controls, and secure data transfer protocols.

55

What is SD-WAN?

Reference answer

SD-WAN applies SDN principles to wide area networks. It dynamically routes traffic over MPLS, broadband, or LTE links based on performance metrics.

56

What is EIGRP and how does it compare to other routing protocols?

Reference answer

EIGRP (Enhanced Interior Gateway Routing Protocol) is a hybrid routing protocol combining features of distance-vector and link-state protocols. It uses the Diffusing Update Algorithm (DUAL) for rapid convergence and minimizes network disruptions. Unlike RIP, which has a hop limit and slower convergence, EIGRP supports classless routing, VLSM, and complex metrics. Compared to OSPF, EIGRP is easier to configure and scales well in diverse networks, though it is proprietary to Cisco devices, limiting its interoperability with non-Cisco equipment.

57

How do you stay updated on the latest developments in network technology?

Reference answer

I actively follow industry blogs and participate in forums like Spiceworks to stay informed about the latest trends. I recently completed my CCNA certification, which deepened my understanding of routing and switching. Additionally, I attended the annual Cisco Live conference, where I learned about emerging technologies like SD-WAN and how they can enhance network performance. I always aim to integrate new insights into our projects to improve efficiency.

58

Describe the 802.11 Association process

Reference answer

Explain the frame exchange between the endpoint/client and the Access Point before the client goes into ‘RUN' state and is authenticated and is able to pass traffic. Provide as much detail as possible. There can be spin off questions based on your response to this question. The answer is probe request, probe response, 802.11 open authentication request, auth response (success), client sends association/ reassociation request and AP responds to that with a association/reassociation response (success). After this depending on the security type of the WLAN/SSID, further frames are exchanged. in the below snippet of wireshark you can see the reassociation process followed by EAP/TLS handshake

59

Describe the function of a DHCP server in a wireless network.

Reference answer

A DHCP (Dynamic Host Configuration Protocol) server assigns IP addresses and other network configuration parameters to wireless devices automatically. It simplifies network management and ensures devices receive valid IP addresses for connectivity.

60

Which of the following is NOT a TCP congestion control mechanism?

Reference answer

Fast Recovery

61

What is the frequency range of the 802.11g standard?

Reference answer

2.4GHz Frequency.

62

Explain the concept of radio frequency (RF) in wireless networking.

Reference answer

Radio frequency (RF) is the range of electromagnetic radiation used for wireless communication. Wireless networks use specific RF frequencies to transmit and receive data signals. Different RF frequencies have different characteristics, such as range, penetration, and interference potential.

63

What is a network bridge and how does it work?

Reference answer

A network bridge, as the name implies, is a device used to connect and "bridge" together different segments of a network. It operates at the data link layer (Layer 2) of the OSI model and can forward traffic between different sections of a network based on the MAC addresses of connected devices. When a data frame comes into the bridge, it reads the MAC address of the sender and adds it to a database of addresses and their associated network segments. When the bridge later receives a frame intended for that MAC address, it knows which segment to send the frame to. The main function of a bridge is to reduce network traffic on a LAN by dividing it into separate segments. It does this by only forwarding traffic to the segment where the intended recipient resides, rather than broadcasting the data across all segments of the network. This results in less congestion and improved overall network performance, particularly in environments with a lot of network traffic.

64

Highlight the advantages of implementing 5G NR.

Reference answer

The adoption of 5G NR comes with advantages, shaping the future of communication Technology. Implementing 5G NR offers unparalleled speed, lower latency, and increased capacity, fostering innovation in diverse sectors. Enhanced Mobile Broadband, massive Machine-Type communication, and ultra-reliable low-latency communication open avenues for transformative applications, ranging from smart cities to autonomous vehicles.

65

When would you use the FHSS technique, and when would you use the DSSS technique?

Reference answer

FHSS (Frequency Hopping Spread Spectrum) is used for resistance to interference and eavesdropping, while DSSS (Direct Sequence Spread Spectrum) is used for higher data rates and better performance in noisy environments.

66

What are supervisor interview questions with STAR-style answer blueprints?

Reference answer

Supervisor interview questions with STAR-style answer blueprints, strong vs weak examples, red flags, and first-time manager framing for candidates and hiring.

67

How would you design a highly available network architecture?

Reference answer

Designing a highly available network involves redundancy, load balancing, and failover strategies. For example, you can use redundant links, multipath routing, and load balancers to enhance network reliability and availability.

68

Discuss Security Event Classification and Grading Methods in Security Operations.

Reference answer

Classification can be based on attack types, while grading considers impact and urgency levels.

69

At which layer of the OSI model is error detection primarily performed to ensure reliable data transmission?

Reference answer

Data Link Layer (Layer 2)

70

What is Network Access Control (NAC)?

Reference answer

NAC enforces compliance checks for devices trying to connect to a network, ensuring they meet security policies before access is granted. It helps prevent malware spread and unauthorized access, thereby strengthening network security.

71

What is Quality of Service (QoS) and how would you implement it to prioritize critical traffic?

Reference answer

Quality of Service (QoS) refers to the ability of a network to provide differentiated service to different types of network traffic. This ensures that critical applications receive the resources they need, even when the network is congested. My understanding is that QoS mechanisms prioritize traffic based on assigned parameters, ensuring that latency-sensitive or business-critical data gets preferential treatment over less important traffic. To implement QoS, I would first classify network traffic based on application, source/destination IP address, or port number. Then, I would use techniques like queuing (e.g., Priority Queuing, Weighted Fair Queuing) and traffic shaping to prioritize the classified traffic. For example, I would configure a router to give priority to VoIP traffic by placing it in a high-priority queue and limiting the bandwidth of less important traffic like file downloads. DSCP marking is also a key component, using the ToS byte in the IP header to signal QoS requirements across the network.

72

What is the difference between Bluetooth and Wi-Fi?

Reference answer

| Bluetooth | Wifi | |---|---| | Bluetooth has no full form. | While Wi-Fi stands for Wireless Fidelity. | | It requires a Bluetooth adapter on all devices for connectivity. | Whereas it requires a wireless adapter Bluetooth for all devices and a wireless router for connectivity. | | Bluetooth consumes low power. | while it consumes high power. | | The security of Bluetooth is less in comparison to the number of Wi-Fi. | While it provides better security than Bluetooth. | | Bluetooth is less flexible means these limited users are supported. | Whereas Wi-Fi supports a large number of users. | | The radio signal range of Bluetooth is ten meters. | Whereas in Wi-Fi this range is a hundred meters. | | Bluetooth requires low bandwidth. | While it requires high bandwidth. |

73

Explain the concept of SSID in wireless networking.

Reference answer

SSID (Service Set Identifier) is the name of a wireless network. It is used to identify the network when searching for available Wi-Fi connections. Devices can only connect to a network if they know its SSID.

74

What is the difference between WEP, WPA, WPA2, and WPA3?

Reference answer

- WEP: Weakest, easily compromised, uses RC4 encryption. - WPA: Improved security over WEP, uses TKIP (Temporal Key Integrity Protocol) encryption. - WPA2: Most secure, uses AES (Advanced Encryption Standard) encryption. - WPA3: Latest, enhances security further with stronger authentication and encryption.

75

What is your understanding of SD-WAN and its applications?

Reference answer

SD-WAN applies SDN principles to wide-area networks, enabling intelligent routing and optimization. It dynamically selects the best path for data transmission based on application needs and network conditions, improving efficiency and reliability. Additionally, SD-WAN reduces operating costs and enhances scalability.

76

What is DHCP?

Reference answer

DHCP is short for Dynamic Host Configuration Protocol. Its principal task is to allocate an IP address to network gadget across the network consequently. It first checks for the following accessible location not yet taken by any PC network gadget, at that point allocates this to a network gadget.

77

What is Network Virtualization?

Reference answer

Virtualization abstracts physical hardware into logical segments, using technologies like VXLAN, NVGRE, and Hyper-V networking.

78

Why did you apply for this particular network engineer job?

Reference answer

Network engineer interview questions and answers like this require you to research the potential employer to genuinely understand the organisation's mission, vision, and values. You probably did this before applying for the role, but refreshing your memory to prepare a response to this question would be a smart move. Here's how to prepare for network engineer interview questions like this: "I'm really eager to take on this network engineering job and be a part of what looks like a creative and collaborative team. The prospect of engaging in some of the projects you've worked on excites me and is something I'm motivated and ready to be a part of. I genuinely believe this environment will enable me to make a more significant impact and forge meaningful connections in my network engineering career."

79

What are the recommended channels if you are setting up three WLANs and want minimum interference over there?

Reference answer

1) There is a need of selecting the channels for setting up WLANs, to communicate; all the components of a Wi-Fi network must use the same channel. In the Wi-Fi network in infrastructure mode (using an access point), it depends on the channel set at the access point. 2) For better results when using Wi-Fi, it is necessary to adjust the channel on the access point as well as configured on the client, to take the least use channel in your neighbourhood. 3) To do this you can use software such as NetStumbler, which will list the neighbourhood Wi-Fi networks and channels used. Note:- The channels most frequently used to select one as free as possible. So the recommended channels are as follows:- Channel 1: 2.412 MHz Channel 2: 2.417 MHz Channel 3: 2.422 MHz Channel 4: 2.427 MHz Channel 5: 2.432 MHz Channel 6: 2.437 MHz You can choose from these channels while setting up the WLANs.

80

What are the hardware layers or network support layers in the OSI model?

Reference answer

The hardware layers, or network support layers, in the OSI model make the Physical Layer (Layer 1) and the Data Link Layer (Layer 2). The Physical Layer handles the actual transmission and reception of raw data over a physical medium, such as cables or wireless signals. The Data Link Layer handles the physical transmission link, ensuring error-free communication and addressing between devices on the same network segment.

81

What is a link?

Reference answer

A connection between two or more devices is called a link. A link defines different protocols that help a device to connect with another device within a network.

82

What is Multicast?

Reference answer

Multicast is a method of group communication where the sender sends data to multiple receivers or nodes present in the network simultaneously. Multicasting is a type of one-to-many and many-to-many communication as it allows sender or senders to send data packets to multiple receivers at once across LANs or WANs. This process helps in minimizing the data frame of the network. For more details please read Multicasting in computer network article.

83

What is Network Security?

Reference answer

It protects networks from unauthorized access or misuse through encryption, firewalls, segmentation, and access control.

84

How can Bash be used for network automation?

Reference answer

Bash helps automate repetitive actions on Unix-based systems and simplifies tasks like configuring network interfaces, managing firewall rules, and performing routine maintenance.

85

What is RIP?

Reference answer

RIP, short for Routing Information Protocol, is utilized by switches to send information starting with one network then onto the next. It effectively oversees steering information by communicating its directing table to any remaining switches inside the network. It decides the network distance in units of bounces.

86

Models of Outdoor Rugged Access Points/Bridges?

Reference answer

Models Include: Aironet 1530, 1540, 1560, 1570, 1552, and Industrial Wireless 3702. Below are some of the latest Cisco Outdoor Rugged Access Points - Aironet 1530 Series Aironet 1540 Series Aironet 1560 Series Aironet 1570 Series Aironet 1552 Access Point Industrial Wireless 3702

87

What is the 802.11a standard?

Reference answer

802.11a operates in the 5 GHz frequency band and offers a maximum data rate of 54 Mbps. It was the first standard to use orthogonal frequency-division multiplexing (OFDM) for more efficient data transmission. However, it has limited range and is more susceptible to interference.

88

How do you handle vulnerabilities in legacy systems?

Reference answer

Handling vulnerabilities in legacy systems involves: ● Risk Assessment: Evaluate the potential risks associated with vulnerabilities in legacy systems. ● Mitigation Strategies: Implement compensating controls or workarounds to reduce the risk of exploitation. ● Segmentation: Isolate legacy systems from critical parts of the network to minimize exposure. ● Patching and Updates: Apply available patches or updates while considering the impact on legacy systems. ● Replacement or Upgrade: Develop a plan to replace or upgrade legacy systems with more secure and supported alternatives.

89

Describe the Purpose and Working Principle of STP.

Reference answer

STP (Spanning Tree Protocol) prevents loops by creating a tree-like topology. It detects network changes and activates blocked ports as backups in case of link failures.

90

What is a WAN?

Reference answer

WAN stands for Wide Area Network. It is an interconnection of computers and devices that are geographically dispersed. It connects networks located in different regions and countries.

91

What does 10Base-T mean?

Reference answer

The 10 alludes to the information move rate. For this situation, it is 10Mbps. The word Base alludes to baseband instead of broadband.

92

What is DNS (Domain Name System) and why is it crucial?

Reference answer

DNS, or Domain Name System, acts like a phonebook for the internet. It translates human-readable domain names (like google.com) into IP addresses (like 142.250.185.142), which computers use to identify each other on the network. Without DNS, we'd have to remember and type in these complex IP addresses every time we wanted to visit a website. DNS is crucial because it makes the internet user-friendly. It allows us to use memorable names instead of cumbersome numbers. Furthermore, DNS facilitates changes to IP addresses without affecting the user experience; a website can change its IP address, and DNS will update the mapping, so users continue to access it using the same domain name.

93

Elaborate on the role of network planning in optimising 5G.

Reference answer

Effective network planning is fundamental to achieving optimal performance in 5G networks. It involves strategic placement of gNBs, careful consideration of radio frequency planning, and capacity planning to meet the specific requirements of diverse applications. Thorough planning is essential for ensuring seamless connectivity, high performance, and user satisfaction.

94

Can IP Multicast be load-balanced?

Reference answer

No, The IP multicast multipath command load splits the traffic and does not load balance the traffic. Traffic from a source will use only one path, even if the traffic far outweighs traffic from other sources.

95

What is BGP, and how does it function in network routing?

Reference answer

BGP (Border Gateway Protocol) is an inter-domain routing protocol used to exchange routing information between different autonomous systems (ASes) on the internet. It helps manage how data is routed across the internet. Example of How BGP Is Involved- Example with ‘traceroute app.lightrun.com' - From Your Network (ISP): Your ISP's network (which is part of an AS) sends packets to a neighboring AS, which might be a larger backbone provider like Cogent. - Cogent Communications: Cogent receives the packets and uses BGP to determine the best route to the destination network. - AWS Network: Finally, the packets reach AWS's network. AWS's own internal routing, potentially influenced by BGP routes from different providers, directs the packets to the specific AWS service (like app.lightrun.com).

96

How can a network analyzer like Wireshark be used to troubleshoot network issues?

Reference answer

A network analyzer like Wireshark captures and analyzes network traffic, providing insights into communication patterns, protocols, and potential problems. It essentially acts as a network "stethoscope". To troubleshoot network issues, Wireshark can be used to: - Identify the source of high latency or packet loss. - Detect misconfigured network devices or applications. - Analyze protocol-specific issues (e.g., TCP retransmissions, DNS errors). - Investigate security incidents by examining malicious traffic. - Verify that network traffic is being routed correctly. - Filter traffic based on specific criteria (e.g., IP address, protocol, port) to isolate the problem. For example, to see all traffic from a specific IP, you could use a filter like "ip.src == 192.168.1.100".

97

What is Kerberos?

Reference answer

Kerberos is a network security protocol initially developed by MIT (Massachusetts Institute of Technology) that is specifically utilized for authenticating service requests among multiple trusted hosts over an untrusted network, such as the Internet. It works via various crucial elements. These are: - Client: The individual attempting to establish a connection with a particular service. - Server: The server is responsible for hosting the service. - Authentication Server (AS): Verifies the identity of the user. Upon successful client authentication, a Ticket Granting Ticket (TGT) is generated as evidence of the client's authenticity. - Ticket Granting Server (TGS): A server application that generates and delivers service tickets. - Key Distribution Center (KDC): A server that hosts AS, database, and TGS.

98

What is network automation, and how is it applied?

Reference answer

Network automation uses tools like scripts, APIs, and configuration management software to handle network tasks, such as device configuration and monitoring. It enhances efficiency, accuracy, and scalability in managing complex networks.

99

What is QoS (Quality of Service)?

Reference answer

Quality of Service (QoS) is a networking feature that gives important network traffic higher priority than less important traffic. In simple words, it controls which data should move first in the network when the network gets busy. A network carries many types of data: - Video calls - Voice calls - YouTube Videos - File Downloads - Emails - Online games, etc. But not all traffic is equally important. Without QoS, all the traffic is treated the same way, which can cause: - Voice breaking - Video buffering - Slow application performance - Lag during meetings, etc. QoS solves these problems by giving priority to important traffic.

100

How would you troubleshoot complex routing issues in a large, multi-protocol network?

Reference answer

Troubleshooting complex routing issues in a large, multi-protocol network involves a systematic approach. First, I'd define the scope of the issue by gathering information: which networks are affected, what protocols are involved (e.g., BGP, OSPF, static routes), and what's the expected vs. actual routing behavior? Then, I'd use network monitoring tools, traceroute , ping , and protocol-specific debugging commands (like show ip route , show bgp summary ) to identify the point of failure or misconfiguration. Log analysis on routers is also essential. Next, I would iteratively isolate the problem. For example, if BGP is involved, I'd check neighbor adjacencies, route policies, and advertised prefixes. I'd verify routing tables for inconsistencies and look for routing loops. If necessary, I would perform packet captures to analyze traffic patterns and identify unexpected behavior. Remember to document each step for clear communication with the team and to have a solid understanding for future incidents.

101

What network engineering skills could you improve upon?

Reference answer

Interviewers don't ask these types of network engineer interview questions to catch you out or make you think you're not suited for the role; they clearly think you have the potential if you've reached the interview stage. Instead, an interviewer will ask you this question to gain insight into what areas of network engineering you feel you could improve so they can determine how they can support you, potentially through training and development. Hereâ€™s how you could respond to this question: â€œAlthough I have a deep knowledge of network engineering, I would like to improve on my ability to present and translate complex ideas and processes to non-technical shareholders in a way that they will understand and benefit from.â€

102

What are some security threats to wireless networks?

Reference answer

Common threats include: - Eavesdropping: Unauthorized interception of data transmission. - Man-in-the-middle attack: An attacker intercepts communication between two parties. - Denial of service attack: An attacker disrupts network connectivity for legitimate users. - Password cracking: An attacker attempts to guess or crack wireless network passwords.

103

What is FTP and how does it work?

Reference answer

FTP, or File Transfer Protocol, is a standard network protocol that allows files to be transferred over the internet from one computer to another. It's basically a set of rules that define how files should move between devices on a network. FTP operates on a client-server model. The client initiates a connection with the server to request files or to send files. To start this file transfer, a user usually needs to log in to the FTP server, although some servers may provide guest or anonymous access. A notable feature of FTP is that it uses two separate connections for data transfer and control commands, ensuring that the file transfers are robust and reliable. This protocol is widely used for transferring large files or for uploading files to a server. However, it's worth noting that data transferred using FTP is not encrypted, and it can be intercepted in transit. So, for sensitive data, it might be better to use versions of FTP that employ security measures, like FTPS or SFTP, which use encryption for data transfer.

104

What is the benefit of implementing a fault tolerance system?

Reference answer

Implementing a fault tolerance system ensures that data is continuously available by eliminating a single point of failure.

105

Explain VLAN and Its Benefits.

Reference answer

VLAN (Virtual LAN) groups devices into separate logical networks, even if they're on the same physical switch. Advantages: - Reduces broadcast traffic. - Improves security (departmental isolation). - Enhances manageability. - Enables policy-based segmentation.

106

Have you led a team of engineers before?

Reference answer

This question evaluates leadership experience and capability in managing engineering teams.

107

What is a private IP address?

Reference answer

Private IP addresses are relegated for use on intranets. These locations are utilized for inner networks and are not routable on outside open networks. This guarantee that no contentions are available among inner networks. Simultaneously, a similar scope of private IP addresses is reusable for various intranets since they don't "see" one another IP address.

108

What is the difference between a switch and a hub?

Reference answer

A switch and a hub are both networking devices that connect multiple devices together on a network, but they operate differently. A hub is a basic network device that connects multiple devices together on a Local Area Network (LAN) and sends incoming data packets to all connected devices, regardless of the intended recipient. This can lead to lots of unnecessary network traffic, plus it's not exactly secure, since all the data is sent to all devices. A switch, on the other hand, is a bit smarter. It can examine and understand the data it receives, and it can direct data to a specific device on the network instead of all of them. It does this by maintaining a list of all the devices connected to it and the corresponding physical (MAC) addresses. This contributes to a much more efficient and secure network because the data only goes where it needs to. So, in essence, while both switches and hubs are used for connecting devices in a network, switches offer better performance and security due to their ability to direct traffic rather than just broadcasting it to all connected devices.

109

Can you tell me about your steps in analyzing network performance?

Reference answer

Demonstrates whether the candidate's knowledge and experience are aligned with expectations.

110

What is the difference between TCP and UDP?

Reference answer

111

How do you ensure compliance with security regulations and standards?

Reference answer

Ensuring compliance involves: ● Understanding Requirements: Familiarize yourself with relevant regulations (e.g., GDPR, HIPAA) and industry standards (e.g., ISO 27001). ● Policy Development: Develop and implement security policies that align with regulatory requirements and best practices. ● Regular Audits: Conduct internal and external audits to verify compliance with security policies and regulations. ● Training and Awareness: Provide regular training for employees on security policies, procedures, and compliance requirements. ● Documentation: Maintain thorough documentation of security practices, policies, and compliance efforts.

112

Elaborate on the distinctions between TDD and FDD in the realm of 5G NR.

Reference answer

Time Division Duplex (TDD) and Frequency Division Duplex (FDD) are two duplexing techniques used in 5G NR. TDD and FDD differ in how they allocate frequencies for communication. TDD is more flexible as it dynamically adjusts the ratio of uplink to downlink, optimising spectrum usage. On the other hand, FDD provides separate frequencies for uplink and downlink, ensuring simultaneous communication but with less flexibility.

113

Describe the difference between infrastructure mode and ad-hoc mode.

Reference answer

In infrastructure mode, devices connect through an access point or wireless router, which manages the network. In ad-hoc mode, devices connect directly to each other without an access point, suitable for small, temporary networks.

114

Explain Trunking.

Reference answer

Trunking allows multiple VLANs to traverse a single physical link using 802.1Q encapsulation.

115

Explain the TCP three-way handshake in detail.

Reference answer

Before getting into the detailed answer, first remember these 3 words: SYN, SYN-ACK, ACK. Talking about TCP. Before any data is sent ove to TCP, the client and server are expected to make sure that the connection is reliable. In this case, TCP uses a three-way handshake method where it establishes a connection where both sides are ready to send and receive data. Here's how it goes: 1. A client, say your browser wants to connect to a server. It starts by sending a SYN packet. Along with this, it includes an initial sequence number basically saying, “I want to start a connection, and here's where my data numbering begins.” 2. The server receives this and responds with a SYN-ACK. Two things take place here, it acknowledges the client's sequence number and also sends its own sequence number back. 3. Now the client sends a final ACK, confirming that it received the server's sequence number. 4. At this point, the connection is established, and data transfer can begin. You might wonder why 3 steps are required here instead of 2 And it is because both sides need to confirm two things, and that is if they can send and receive. With only two steps, the server wouldn't know if the client actually received its response. Once communication is done, the connection is closed using a four-step process, i.e, FIN - ACK - FIN - ACK, which is slightly more involved. Here's what you might get asked during the interviews for a follow-up: Q. What happens if the SYN-ACK is lost? Your Ans: The client waits for a timeout and then retransmits the SYN packet. Q. What is a SYN flood attack? Your Ans: It's when an attacker sends a large number of SYN requests but never completes the handshake. This leaves connections half-open and can exhaust server resources.

116

What is Border Gateway Protocol (BGP) and its primary purpose?

Reference answer

Border Gateway Protocol (BGP) is the essential routing protocol used between different Autonomous Systems (AS) on the internet. An AS is a network under a single administrative domain, like an ISP or a large organization. BGP's primary purpose is to exchange routing information between these ASes, enabling internet-wide connectivity. Unlike interior gateway protocols, BGP is a path-vector protocol, meaning it considers the entire path of ASes when choosing the best route to a destination. This helps prevent routing loops and allows for policy-based routing between ASes.

117

What is Data Encapsulation?

Reference answer

Data Encapsulation is the process of packaging data with suitable data, such as headers and trailers, as it passes through the various layers of a network protocol architecture. Each layer adds layer-specific metadata to the information packet to ensure correct routing and distribution throughout the network.

118

What is roaming in a wireless network, and how does it work?

Reference answer

Roaming allows a wireless device to move between different access points within the same network without losing connectivity. The wireless controller or access points manage the handoff process to ensure seamless connection and maintain network performance.

119

What is network security?

Reference answer

Network security is a broad term that encompasses the strategies and measures designed to protect the integrity, confidentiality, and accessibility of computer networks and data using both software and hardware technologies. It's all about defending your network from a variety of threats, such as hackers, malware, and denial-of-service attacks. Every organization that uses a computer network should have some level of network security in place. This can include solutions like firewalls to filter out malicious traffic, antivirus software to detect and nullify threats, and encryption to scramble data so it can't be understood if intercepted. Network security also involves practices and policies that network admins follow to prevent and monitor unauthorized access, misuse, or modifications. This can include educating employees about safe online habits, limiting access rights to the network, and regularly updating software to patch vulnerabilities. In essence, network security is a critical aspect of IT that keeps networked data safe, allowing businesses, government entities, and individuals to conduct their online activities securely.

120

What is the difference between a switch, router, and bridge?

Reference answer

For basic understanding, the difference between these 3 are: - Switch - Connects various devices using a single LAN and MAC - Router - Connects different networks - Bridge - Connects two network segments Sounds confusing? Don't worry, I'll explain the difference between each! These three devices all move data, but they don't operate at the same level or for the same purpose. A bridge works at Layer 2, which is the Data Link layer, and connects two network segments. It looks at MAC addresses and decides whether to forward or filter traffic. You can think of it as an early way to reduce unnecessary traffic between two parts of a network. Bridges usually have very few ports and are mostly considered predecessors to switches. Now, a switch does something similar to a bridge but on a much larger scale. It is essentially a multiport bridge. It also works at Layer 2 and uses a MAC address table to forward frames only to the correct device instead of broadcasting to everyone. Because switches are hardware-based and have many ports, they are much faster and more efficient than bridges. This is why switches have almost completely replaced bridges in modern networks. A router operates quite differently. It works at Layer 3 which is the Network layer and uses IP addresses instead of MAC addresses. Its job is to connect different networks, for example, your home network to the internet. Instead of a MAC table, it uses a routing table to decide where to send packets. One thing you should keep in mind is that modern networks often use Layer 3 switches, which combine both switching and routing capabilities.

121

What is the difference between a client and a server in wireless networking?

Reference answer

- Client: A device that requests services from a server, such as a computer accessing a website. - Server: A device that provides services to clients, such as a web server hosting a website.

122

What are some key differences between the OSI model and the TCP/IP model?

Reference answer

The TCP/IP model consists of four layers: Link, Internet, Transport, and Application. It differs from the OSI model in terms of layer functions and the number of layers but serves as the foundation for most modern networks.

123

What are private IP addresses?

Reference answer

Private IP addresses are assigned for use on intranets. These addresses are used for internal networks through the IP address and are not routable on external public networks. This ensures that no conflicts are present among internal networks.

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