20+ Constantly Asked Questions on Computer Networks basics in Interviews

computer networks basic interview preparation

Data communications and computer networks basics are the fastest growing technologies nowadays. Thus it is not only a part of the syllabus but also one of the most favorite topics for the interviewers to ask questions on. However, commonly students get caught up when this topic comes up.

Don’t worry!!!!! It won’t be an issue now.

So in turn, to avoid such situations. Not only avoid but to provide an apt answer to all the questions related to computer networks basics we have; picked out 20 of the most commonly asked question on computer networks in technical interviews.

So Let’s Jump into the questioning.

Basics computer networks interview question

Q.1 What is a Network

A Network can be defined as a system or a connection that consists of 2 more computers or devices connected together so that they can communicate and exchange information among themselves.

Q.2 Components of communication system

  • Message:- The message is the information (data) that is to be share
  • Sender:- The sender is the device/PC that sends the data message or information.
  • Receiver:- The receiver is the device that receives the sent message.
  • Medium:- The transmission medium is a wireless or wired path by which
  • a message travels from sender to receiver.
  • lastly, Protocol:- A protocol is a set of rules that govern data exchange.

Q.3 what is protocol

A protocol is a law that controls data communications. It represents an association between the communicating devices. Each device on the network has its own protocol. However, without a protocol, a connection is similar to watching k drama without subtitles.

Q.4 what is node and link

A node is a connection/joining point within a network that can exchange (i.e. receive, send, create, or store) data.

A link is a medium between two or more nodes, it can be either a hardware link or a software link.

Q.5 What are types of networks

  • LAN
  • MAN
  • WAN

Q.6 what is LAN

However, a local area network (LAN) is usually privately own and connects the devices in a small area such as a single office, building, or campus.

Depending on the requirement of the source and the type of technology used, a LAN can be as simple as two desktops and a printer in someone’s home office, or it can extend to a large scale to multiple devices connected together. Mostly its size is within a few kilometers. For example:- Ethernet and Wi-Fi.

Q.7 What is MAN

A metropolitan area network (MAN) is a network whose computer connections spread over a size between a LAN and a WAN (i.e. area inside a town or a city). It is basically designed for users that require high speed. For example: – a collection of LANs.

Q.8 What is WAN

A wide area network (WAN) is preferred for wide-area transmission over large geographic areas i.e. India (country), Asia (continent), or even the whole world.

Q.9 Types of topology

  • MESH
  • STAR
  • TREE
  • BUS
  • RING
  • Lastly HYBRID

Q.10 What is OSI model

Open Systems Interconnection (OSI) model was designed by an international standards organization.
It consists of Seven Layers

Application– The application layer provides an interface to the user to interact.

Presentation– The presentation layer is responsible for translation, compression, and encryption of the information exchanged between two systems.

Session– The session layer is responsible for the establishment of connection, security, and synchronization.

Transport– The transport layer is responsible for the delivery of a message/information from one process to another process.

Network– The network layer is responsible for the delivery of packets from one source to another destination, mainly across multiple networks (links). The network layer is responsible for logical addressing and routing of the message to the exact location.

Datalink– The data link layer transforms the physical layer, a raw bit-stream, into a reliable link by adding the header and the trailer to the packet. The data link layer is responsible for framing, physical addressing, flow control, access control, error control.

Physical– It is the last layer f the OSI model. It provides a physical connection between the two devices. It deals with error control, flow control, interfacing, medium selection and etc.

Q.11 Protocols in Network Layer

The network layer is responsible for the delivery of packets from one source to another destination. The network layer mainly consists of five protocols: –

  • IP (Internetworking Protocol)
  • ARP (Address Resolution Protocol)
  • RARP (Reverse Address Resolution Protocol)
  • ICMP (Internet Control Message Protocol)
  • Lastly IGMP (Internet Group Message Protocol)

Q.12 Protocols in Transport Layer

The transport layer is responsible for the delivery of a message/information from one process to another process.

  • UDP (User Datagram Protocol)
  • TCP (Transmission Control Protocol)
  • Lastly SCTP (Stream Control Transmission Protocol)

Q.13 Protocols in Application Layer

  • HTTP
  • FTP
  • SMTP
  • DNS
  • Lastly TELNET

Q.14 Design Issues for the Computer Network

  • Reliability: – It is the measure of faliure by frequency.
  • Scalability: – The size of the network should be compact.
  • Error Control: – Data should be protected while transmission.
  • Flow Control: – The rate of transfer of data shoul be constant and same all of the devices n the network.
  • Routing: – selection of best route.
  • Lastly Security: – Protection from inteferance and hacking.

Q.15 What is VPN? Explain?

Virtual private network (VPN) is a technology that is quite trending among large industries and companies that use the global Internet for both intra- and inter-organization communication but requires privacy in their internal communications. It is because it allows to access shared information and, at the same time, provides security.

Q.16 What is IPV4 and IPV6

IPV4 is a 32-bit (4-byte) decimal address notation. each byte is separated by a dot. It is the fourth version of IP. Each device has its own unique address. For example

IPV6 is the sixth address of IP. It is a 128-bit hexadecimal address notation. For example 2002:34df:0000:34fe:0000:3456:456t:345e

Q.17 Explain UDP Protocol

The User Datagram Protocol (UDP) is called a connectionless, security-less, unreliable transport protocol. It is the simplest form of transport protocol because it does not provide any other control mechanism it simply passes the data from one process to another. It provides nearly no error correction or checking.

Sending a small message/data by using UDP takes much less interaction between the sender and receiver than using any other protocol like TCP or SCTP.

Q.18 What is ICMP Protocol

The Internet Control Message Protocol (ICMP) is a protocol used by hosts/source and gateways to send notifications/signals of datagram problems back to the sender. ICMP sends a query (simple and special), error-reporting messages.

Q.19 What is HTTP, FTP and SMTP Protocol

HTTP (Hypertext Transfer Protocol) is used t access the data or information on the world wide web. It has combined features of two protocols i.e. FTP and SMTP. It uses services of well-known on port 80. It is one of the simplest protocols as it is stateless.

FTP is a standard protocol mechanism used for copying a file from one source/host to another.

SMTP (Simple Mail Transfer Protocol) is a formal protocol that is use to define the MTA server and client. In a mail service, SMTP is used twice.

Q.20 What is TCP Protocol

It is a connection-based protocol in which there is a virtual connection between the nodes i.e. the source and the destination. In this protocol, we can control and provide corrections to flow, access and error.


I hope that this article helps you all to get prepare easily for the basics questions of computer networks interviews. I will be covering many more questions in the upcoming article so be connected. And if you have got any doubt then feel free to reach out to us we will be more than happy to reply.


Happy Reading:)

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