Basic 30 Interview Questions on Networking

Basic 30 Interview Questions on Networking

Here we have curated a list of basic 30 Interview Questions and Answers. Here you get frequently asked questions on Networking questions which every fresher should know this answers.

Interview Questions on Networking

1. What is a gateway or Router?

Ans: A node that is connected to two or more networks is commonly called a router or Gateway. It generally forwards messages from one network to another.

2. What is a point-point link?

Ans: If the physical links are limited to a pair of nodes it is said to be a point-point link.

3. What is Multiple Access?

Ans: If the physical links are shared by more than two nodes, it is said to be multiple access.

4. What are the advantages of distributed processing?


  • Security/Encapsulation
  • Distributed database
  • Faster problem solving
  • Security through redundancy
  • Collaborative Processing

5. Name the factors that affect the performance of the network?


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

6. What is the protocol?

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

7. What are the key elements of protocols?

Ans: The key element of protocols are

  • Syntax: It refers to the structure or format of the data, that is the order in which they are presented.
  • Semantics: It refers to the meaning of each section of bits.
  • Timing: Timing refers to two characteristics: when data should be sent and how fast they can be sent.

8. What is a frame relay, in which layer it comes from?

Ans: Frame relay is a packet-switching technology. It will operate in the data link layer.

9. What is Mac address?

Ans: The address for a device as it is identified at the Media Access Control (MAC) layer in the network architecture. Mac address is usually stored in ROM on the network adapter card and is unique.

10. What Automatic Repeat Request (ARQ)?

Ans: Error control is both error detection and error correction. It allows the receiver to inform the sender of any frames lost or damaged in transmission & coordinates the retransmission of those frames by the sender. In the data link layer, the term error control refers primarily to methods of error detection & retransmission. Error control in the data link layer is often implemented simply: Any time an error Is detected in an exchange. specified frames are retransmitted. This process is called automatic repeat request (ARQ).

Interview Questions on Networking
Interview Questions on Networking

11. List the layers of OSI?


  • Physical Layer
  • Data Link Layer
  • Network Layer
  • Transport Layer
  • Session Layer
  • Presentation Layer
  • Application Layer

12. What are the concerns of the physical layer?

Ans: Physical Layer coordinates the functions required to transmit a bitstream over a physical medium.

  • Physical characteristics of interfaces and media
  • Representation of bits
  • Data rate
  • Synchronization of bits
  • Line configuration
  • Physical Topology
  • Transmission mode

13. What are the responsibilities of the Data Link layer?

Ans: The Data Link Layer transforms the physical layer, a raw transmission facility, into a reliable link and is responsible for node-node delivery.

  • Framing
  • Physical Addressing
  • Flow Control
  • Error Control
  • Access Control

14. What are the responsibilities of the Network Layer?

Ans: The Network Layer is responsible for the source-to-destination delivery of packets possibly across multiple networks(links).

  • Logical Addressing
  • Routing

15. What are the responsibilities of the Transport Layer?

The Transport Layer is responsible for the source-to-destination delivery of the entire message.

  • Service-point addressing
  • Segmentation and reassembly
  • Connection Control
  • Flow Control
  • Error Control

16. What are the responsibilities of the Session Layer?

Ans: The Session layer is the network dialog controller. It establishes, maintains, and synchronizes the interaction between the communicating system.

  • Dialog Control
  • Synchronization

17. What are the responsibilities of the Presentation layer?

Ans: The Presentation layer is concerned with the syntax and semantics of the information exchanged between two systems.

  • Translation
  • Encryption
  • Compression

18. What are the responsibilities of the Application Layer?

Ans: The Application Layer enables the user, whether human or software, to access the network. It provides user interfaces and support for services such as e-mail, shared database management, and other types of distributed information services.

  • Network Virtual Terminal
  • File Transfer, access, and management (FTAM)
  • Mail Services
  • Directory Services

19. What are the categories of Transmission media?


Guided Media

i) Twisted -Pair cable

  1. Shielded TP
  2. Unshielded TP

ii) Coaxial Cable

iii) Fibre-optic cable

Unguided Media

i) Terrestrial microwave

ii) Satellite Communication

20. What are the types of errors?

  • Single-Bit Error: In a single-bit error, only one bit in the data unit has changed.
  • Burst Error: A Burst error means that two or more bits in the data have changed.
Interview Questions on Networking
Interview Questions on Networking

21. What is Error Detection? What are its methods?

Ans: Data can be corrupted during transmission. For reliable communication, errors must be deducted and corrected. Error Detection uses the concept of redundancy, which means adding extra bits for detecting errors at the destination. The common Error Detection methods are

  • Vertical Redundancy Check (VRC)
  • Longitudinal Redundancy Check (LRC)
  • Cyclic Redundancy Check (CRC)
  • Checksum

22. What is Redundancy?

Ans: The concept of including extra information in the transmission solely for the purpose of comparison. This technique is called redundancy.

23. What is Checksum?

Ans: Checksum is used by the higher layer protocols (TCP/IP) for error detection.

24. What is Forward Error Correction?

Ans: Forward error correction is the process in which the receiver tries to guess the message by using redundant bits.

25. What is Pipelining?

Ans: In networking and in other areas, a task has often begun before the previous task has ended. This is known as pipelining.

26. What is Piggy Backing?

Ans: A technique called piggyback is used to improve the efficiency of the bidirectional protocols. When a frame is carrying data from A to B, it can also carry protocol information about arrived (or lost) frames from B; when a frame is carrying data from B to A, it can also carry control information about the arrived (or lost) frames from A.

27. What is Framing?

Ans: Framing in the data link layer separates a message from one source to a destination, or from other messages to another destination, by adding a sender address that defines where the packet has to go and the sender address helps the recipient acknowledge the receipt.

These are some basic Interview Questions on Networking. If you have any doubt related to Networking ask me in the comment section…

Also-Read: Best 30+ Frequently Asked HR Interview Questions and Answers

Source: Placecom


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