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Top 32 Networking Interview Questions and Answers

| 6 minutes to read


Here is a List of essential Networking Interview Questions and Answers for Freshers and mid level of Experienced Professionals. All answers for these Networking questions are explained in a simple and easiest way. These basic, advanced and latest Networking questions will help you to clear your next Job interview.

Networking Interview Questions and Answers

These interview questions are targeted for a Network Engineer. You must know the answers of these basic and advanced Networking questions to clear a Job interview. This list includes questions for different topics like Network Security, Troubleshooting, Computer Networks, Network Support etc.

1. What is LAN?

Local Area Network (LAN) is a private network that provides the ability to interconnect computers and devices within a limited area like a residence, an office, a building or a campus. LAN can be large or small, It may have range from a single home network user to enterprise network consisting thousands of users. Without caring about size, LAN has a single defining characteristic that it is used to connect multiple devices in a limited area. For more visit LAN.

2. What is WAN?

Wide Area Network - WAN can be defined as set of LANs or other networks which communicates together. WAN is a system of networks where it allows you to share the information and communication between the devices across the Globe. WANs are considered the most expensive and largest networks. For more visit WAN.

3. What is a MAN?

A Metropolitan Area Network (MAN) is a computer network that connects computers in a metropolitan area such as a large city, multiple cities or a large area with multiple buildings. It is larger than a single building local area network (LAN) and smaller than a wide area network (WAN). MAN is not available in urban areas. For more visit MAN.

4. What is the use of Router?

A router provides the capability to connect two or more packet-switched networks or sub-networks. It's mainly responsible for two functions: First, it manages the traffic between networks by forwarding data packets to intended IP addresses and second to allow multiple devices to use the same Internet connection. For more visit Router.

5. What is Bridge? How does the bridge work?

Bridge is a network device that is used to divide a network into segments. Each segment constitutes a different collision domain so it helps to reduce the number of collisions on the network. So Network bridge improves the performance as each collision domain has its own separate bandwidth.
Network bridge works at the Data Link layer (layer two) of the OSI model. It inspects the incoming traffic and decides whether to filter it or forward it. Fore more visit Network Bridge.

6. What is a Hub in Networking?

Hub, Repeater Hub, multiport Hub, active hub or Network Hub is a device that is used to connect multiple Ethernet devices together and these multiple connected devices act as a single network segment. A hub contains multiple ports. Once a packet is ready at one port, it is copied to the other ports so that all segments of the LAN can see all packets. Hub works at the layer-1 (physical layer) of the OSI model. For more visit Hub.

7. What is Switch?

Network Switch is a device that is used to connect multiple devices on a computer network. It uses packet switching to receive and forward the data to the destination device. are the connectivity points of an Ethernet network. Switch sends the data to a single device only, not to a network of multiple devices. For more visit Network Switch.

8. What is Gateway? How does Gateway work?

A Gateway is part of Networking Hardware or Software which is used in telecommunications for telecommunications networks. It connects two networks with different transmission protocols together or allows data flow from one network to another network. Gateway acts as an entry and exit point for a network as all data must pass through or communicate with the gateway prior to being routed.
A Gateway relies on the IP addresses for dissimilar communication between networks. It has control over both domain collisions (inside a network) as well as broadcast(outside the networks) domain. For more visit Gateway.

9. What is the use of Brouter?

Brouter is a piece of Networking hardware that works as a bridge and as a router. The Brouter routes packets for known protocols and forwards all other packets as a bridge would. Brouter operates at both the network layer for routable protocols and at the data link layer for non-routable protocols. For more visit Brouter.

10. What is DNS (Domain Name System)?

The Domain Name System (DNS) is considered as a phonebook of the Internet, Web browsers interact through Internet Protocol (IP) addresses. DNS converts domain names to IP addresses so that browsers can load resources available on the internet. Each device which is connected to the internet has a unique IP address which other machines use to find the device. For more visit What is DNS.

11. Explain OSI model and OSI 7 Layers.

OSI stands for Open System Interconnection is a conceptual model that defines a standard for different computer systems to communicate with others.
As per OSI model, the communication system can be split into seven different abstract layers:
  • Physical Layer transmits raw stream data over physical medium such as cables and switches.
  • Data Link Layer provides the ability to transfer data between two devices.
  • Network Layer responsible to transfer data between two different networks.
  • Transport Layer facilitates end-end communication between two devices.
  • Session Layer opens and closes communication sessions.
  • Presentation Layer makes data ready (translation, compression and encryption) to be used by applications.
  • Application Layer facilitates direct interaction with data from users. As browsers rely on this layer.
For more visit OSI Model.

12. What is TCP/IP? How does it work?

13. What is BGP? How to configure it?

14. Explain Network Architecture or Communication Architecture?

15. Explain GSM in detail.

16. What is Fault Management.

17. What is RAN (Radio access network)?

18. What is LTE? What is LTE used for?

19. What is DHCP? How it works?

20. What is DNS zones?

21. What is the difference between IP helper and DHCP helper?

22. What is the difference between segments, packets and frames? Explain all of them.

23. What is the difference between unicast, multicast and broadcast?

24. What type of message router sends unicast or broadcast?

25. How to check a IP with command on a machine?

26. What is DORA process in DHCP?

DORA is a DHCP client-to-server communication process which consists of following steps as below.

  • Discovery
  • DHCP Offer
  • DHCP Request
  • DHCP Acknowledgment

27. What is the difference between TCP and UDP?

28. What is VPN?

29. What is STP?

Some General Interview Questions for Networking

1. How much will you rate yourself in Networking?

When you attend an interview, Interviewer may ask you to rate yourself in a specific Technology like Networking, So It's depend on your knowledge and work experience in Networking.

2. What challenges did you face while working on Networking?

This question may be specific to your technology and completely depends on your past work experience. So you need to just explain the challenges you faced related to Networking in your Project.

3. What was your role in the last Project related to Networking?

It's based on your role and responsibilities assigned to you and what functionality you implemented using Networking in your project. This question is generally asked in every interview.

4. How much experience do you have in Networking?

Here you can tell about your overall work experience on Networking.

5. Have you done any Networking Certification or Training?

It depends on the candidate whether you have done any Networking training or certification. Certifications or training are not essential but good to have.


We have covered some frequently asked Networking Interview Questions and Answers to help you for your Interview. All these Essential Networking Interview Questions are targeted for mid level of experienced Professionals and freshers.
While attending any Networking Interview if you face any difficulty to answer any question please write to us at Our IT Expert team will find the best answer and will update on the portal. In case we find any new Networking questions, we will update the same here.