Introduction to Computer Network Interview Questions and Answers

Computer Network Interview Questions

Introduction to Computer Network Interview Questions and Answers

Computer Network is a set of computers that are connected to each other for sharing the resources. The major sharing of the resources over the connection is the InternetAnother example of a Computer network sharing resource is the sharing of one printer between different computers by connecting it. The best example of a computer network is the Internet.

Below are mentioned the topmost questions asked in the interview

Now, if you are looking for a job which is related to the Computer Network then you need to prepare for the 2020 Computer Network Interview Questions. It is true that every interview is different as per the different job profiles. Here, we have prepared the important Computer Network Interview Questions and Answers which will help you get success in your interview. These top interview questions are divided into two parts are as follows:

Part 1 – Computer Network Interview Questions (Basic)

This first part covers basic Interview Questions and Answers.

Q1. What do you mean by Network?

Set of devices connected to each other over the physical medium is known as a computer network. For example the Internet.

Q2. What do you mean by Node?

In the computer network, the node is known as a device.

Q3. What do you mean by Network Topology?

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Q4. What is Routers?

A router is a device which is responsible for sending data from source to destination over the computer network.

Q5. What is the OSI model?

OSI model stands for Open System Interconnection. It’s a reference model which describes that how different applications will communicate to each other over the computer network.

Q6. Explain the Different layers of the OSI model.

The different layers of the OSI model are given below:

Physical LayerConverts data bit into an electrical impulse.
Datalink LayerData packet will be encoded and decoded into bits.
Network LayerTransfer of datagrams from one to another.
Transport LayerResponsible for Data transfer from one to another.
Session LayerManage and control signals between computers.
Presentation LayerTransform data into application layer format.
Application LayerAn end user will interact with the Application layer.

Q7. Describe Hub, Switch and Router?


  • Hub: Hub will broadcast all data to every port. It has a common connection point for all devices.
  • Switch: Switch will create the dynamic connection and provide information to the requesting port.
  • Router: Router is the devices which will be responsible for forwarding data packets.

Let us move to the next Computer Network Interview Questions.

Q8. What do you mean by the TCP/IP Model?

TCP/IP stands for Transmission control protocol and Internet protocol. It describes how the data will get transmitted and routed from end to end communication.

Q9. Explain the different Layers of TCP/IP Model.

Application Layer, Transport Layer, Network or Internet Layer, Network interface layer.

Q10. What do you mean by HTTP?

HTTP stands for Hyper Text Transfer Protocol and the port for this is 80. This protocol is responsible for web content.

Q11. What do you mean by TCP and UDP?

TCP stands for Transfer control protocol and UDP stands for User Datagrams protocol and TCP is a connection-oriented protocol and UDP is a Connectionless protocol.

Q12. What do you mean by a Firewall?

Firewall is a concept of a security system that will helps computers to protect it with unauthorized access or any cyber-attack.

Part 2 – Computer Network Interview Questions (Advanced)

Let us now have a look at the advanced Interview Questions.

Q13. What do you mean by DNS?

DNS Stands for Domain Name System. It’s an internet address mapping process with the local name. We can also call it as an internet phonebook.

Q14. What do you mean by Proxy server?

Proxy server prevents the external users which are unauthorized to access the network.

Q15. What do you mean by Classes of Network?

The Classes of IPV4 are of 5 types:

Class A0.0.0.0 to
Class B128.0.0.0 to
Class C192.0.0.0 to
Class D224.0.0.0 to
Class E240.0.0.0 to

Let us move to the next Computer Network Interview Questions.

Q16. What do you mean by NIC?

NIC stands for Network interface card. It is an adapter that will be installed on the computer and because of that NIC, only that computer will interact with the network.

Q17. What do you mean by ASCII?

ASCII is the American Standard Code for Information Interchange.

Q18. What are the types of mode available in Network?

Data transferring mode in a computer network will be of three types:
Simplex, Half-Duplex and Full Duplex.

Q19. What do you mean by SLIP protocol?

SLIP stands for Serial Line Interface Protocol. It is used for sending IP datagram over a network in a single line.

Let us move to the next Computer Network Interview Questions.

Q20. What are the key elements of the protocol?

There are three key elements of the protocol:

  • Syntax: Describe the format of the data.
  • Semantics: Describes the meaning of each section.
  • Timings: Explain the timing that how fast the data can be sent.

Q21. What do you mean by Decoder?

A decoder is a program which converts the encrypted data into its actual format.

Q22. What is the role of IEEE in the world of computer network?

IEEE full form is the Institute of Electrical and electronic Engineer which is used to define and develop the standards which will be used over the network.

Q23. What is the maximum segment length of a 100Base-FX network?

The maximum segment length will be 412 meters.


These are the above important questions related to Computer network. The key topics which you have to cover are OSI model, All layers functionality, Classful Network and classes of the IPv4, Topologies and configuring VPN and VPC.

Recommended Articles

This has been a guide to the list of Computer Network Interview Questions and Answers so that the candidate can crackdown these Computer Network Interview Questions easily. Here in this post, we have studied top Computer Network Interview Questions which are often asked in interviews. You may also look at the following articles to learn more –

  1. Networking Interview Questions
  2. Network Security Interview Questions
  3. Career in Computer Science
  4. Oracle Database Interview Questions

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