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Computer Networking Interview Questions & Answers (Freshers) Free Download

Computer Networking Interview Questions

Those Freshers, who are going to appear in Interview after their undergraduate and graduate they must go through the Computer Networking Interview Questions & Answers which is given below. You can also download computer networks interview questions and answers PDF free.

Interview is the most important thing and if you are going for an interview you must be well prepared for this because you don’t get a second chance to make a great first impression. The one who is preparing computer networking section for interview must need interview questions on computer networks. You can get it through this single page.

Technical Interview Questions On Computer Networks

In this page we have covered interview questions for computer networks for Fresher’s. As networking is a difficult topic. The one who are preparing for an interview must be careful while answering the questions. After going through the basics of computer networks interview questions on this page which is well created by the team of, you will Crack Interview Round easily.

Computer Networking Interview Questions

Computer Networking is the interconnection of multiple devices, generally termed as Hosts connected using multiple paths for the purpose of sending/receiving data or media. Here below we are providing the list of basic interview questions on computer networks. Check out the best computer networks basics interview questions and answers and also download computer networks interview questions with answers pdf.

Question1: Define Network?

Answer: A network is a set of devices which in which two or more nodes are connected by a physical linked or more than two networks.

Question2: what is a Link?

Answer: A link refers to the connectivity between two devices which includes the type of cables and protocols that are used in order to communicate one device with the other.

Question3: what is Protocol?

Answer: A protocol is a set of rules that govern all aspects of information communication.

Question4: Name the factors that affect the performance of the network?


  • Number of Users
  • Type of transmission medium
  • Hardware
  • Software

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Question5: what is a LAN?

Answer: LAN is short for Local Area Network. It refers to the connection between computers and other network devices that are located within a small distance location.

Question6: Describe Network Topology?

Answer: Network Topology refers to the layout of a computer network. It shows how devices and cables are physically laid out, as well as how they connect to one another.

Question7: what is WAN?

Answer: WAN (Wide Area Network), is an interconnection of computers and devices that are geographically dispersed. It connects networks that are located in different regions and countries.

Question 8: Describe Network Topology?

Answer: Network Topology refers to the layout of a computer network. It shows how devices and cables are physically laid out, as well as how they connect to one another.

Question9: Describe star topology?

Answer: Star topology consists of a central hub that connects to nodes. This is one of the easiest to setup and maintain.

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Question10: what are gateways?

Answer: Gateways provide connectivity between two or more network segments. It is usually a computer that runs the gateway software and provides translation services. This translation is a key in allowing different systems to communicate on the network.

Question 11: what is the use of a default gateway?

Answer: Default gateways provide means for the local networks to connect to the external network. The default gateway for connecting to the external network is usually the address of the external router port.

Question12: what common software problems can lead to network defects?

Answer: Software related problems can be any or a combination of the following:

  • Client server problems
  • Application conflicts
  • Error in configuration
  • Protocol mismatch
  • Security issues
  • User policy and rights issues

Question13: Explain the importance of authentication?

Answer: Authentication is the process of verifying a user’s credentials before he can log into the network. It is normally performed using a username and password. This provides a secure means of limiting the access from unwanted intruders on the network.

Question 14: Explain profile in terms of networking concept?

Answer: Profiles are the configuration settings made for each user. A profile may be created that puts a user in a group, for example.

Question 15: Differentiate between hub and switch.


  • Hub is a layer 1 device while Switch is layer 2 device.
  • Hub works on single collision and single broadcast domain while switch works on per port collision and single broadcast domain.

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Question16: What is NIC?


  • NIC stands for Network Interface Card.
  • It is a peripheral card attached to a PC to helps it connect to a network.

Question17: What are the advantages of fiber optics cable?

Answer: The advantages of fiber optics cable over twisted pair cable are Noise resistance-As they use light so external noise is not a factor. Less signal attenuation-fiber optics transmission distance is significantly greater than that of other guided media. Higher bandwidth-It can support higher bandwidth.

Question18: Define IP?

Answer: Internetwork protocol (IP) is the transmission mechanism used by TCP/IP protocol. It is an unreliable and connectionless datagram protocol. It provides no error checking and tracking.

Question 19: What do you mean by redundancy?

Answer: Redundancy is the concept of sending extra bits for use in error detection. Three common redundancy methods are parity check, cyclic redundancy check (CRC), and checksum.

Question20: Define TCP?

Answer: It is connection oriented protocol. It consist byte streams originating on one machine to be delivered without error on any other machine in the network. While transmitting it fragments the stream to discrete messages and passes to interne layer. At the destination it reassembles the messages into output stream.

Question21: What are the layers of the OSI reference model?

Answer: There are 7 OSI layers: Physical Layer, Data Link Layer, Network Layer, Transport Layer, Session Layer, Presentation Layer and Application Layer.

Question 22: What is the maximum length allowed for a UTP cable?

Answer: A single segment of UTP cable has an allowable length of 90 to 100 meters. This limitation can be overcome by using repeaters and switches.

Question23: What does 10Base-T mean?

Answer: The 10 refers to the data transfer rate, in this case is 10Mbps. The word Base refers to base band, as oppose to broad band. T means twisted pair, which is the cable used for that network.

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Question24: What is the advantage of address sharing?

Answer: By using address translation instead of routing, address sharing provides an inherent security benefit. That’s because host PCs on the Internet can only see the public IP address of the external interface on the computer that provides address translation and not the private IP addresses on the internal network.

Question25: What is DHCP?

Answer: DHCP is short for Dynamic Host Configuration Protocol. Its main task is to automatically assign an IP address to devices across the network. It first checks for the next available address not yet taken by any device, then assigns this to a network device.

Question26: What is the difference between TFTP and FTP application layer protocols?

Answer: The Trivial File Transfer Protocol (TFTP) allows a local host to obtain files from a remote host but does not provide reliability or security. It uses the fundamental packet delivery services offered by UDP.

The File Transfer Protocol (FTP) is the standard mechanism provided by TCP / IP for copying a file from one host to another. It uses the services offer by TCP and so is reliable and secure. It establishes two connections (virtual circuits) between the hosts, one for data transfer and another for control information.

Question27: Explain 5-4-3 rule?

Answer: In a Ethernet network, between any two points on the network ,there can be no more than five network segments or four repeaters, and of those five segments only three of segments can be populated.

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Question 28: What is autonomous system?

Answer: It is a collection of routers under the control of a single administrative authority and that uses a common Interior Gateway Protocol.

Question29: Define Encoder?

Answer: A device or program that uses predefined algorithms to encode, or compress audio or video data for storage or transmission use. A circuit that is used to convert between digital video and analog video.

Question 30: Define Decoder?

Answer: A device or program that translates encoded data into its original format (e.g. it decodes the data). The term is often used in reference to MPEG-2 video and sound data, which must be decoded before it is output.

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Significant Note:

You probably now have a good idea of computer networks interview questions and answers for freshers that can be asked in computer networks interview.You can follow us on Facebook, Google Plus, Twitter or Whatsapp to get updates of Computer Networking Interview Questions & Answers.

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