Networking Interview Questions

17 September, 2018


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Networking Interview Questions

Following are some of the most frequently asked Networking interview questions in the interview, here are the answers for them.

What is a node?

A network can consist of two or more computers directly connected by some physical medium such as coaxial cable or optical fiber. Such a physical medium is called as Links and the computer it connects is called as Nodes.

What is a gateway or Router?

A node that is connected to two or more networks is commonly called as router or Gateway. It generally forwards message from one network to another.

Define Network?

A network is a set of devices connected by physical media links. A network is recursively is a connection of two or more nodes by a physical link or two or more networks connected by one or more nodes.

What is Protocol?

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

What is a Link?

At the lowest level, a network can consist of two or more computers directly connected by some physical medium such as coaxial cable or optical fiber. Such a physical medium is called as Link.

What are the two types of transmission technology available?

(i) Broadcast and

(ii) point-to-point

What is Bandwidth?

Every line has an upper limit and a lower limit on the frequency of signals it can carry. This limited range is called the bandwidth.

Explain RIP (Routing Information Protocol)

It is a simple protocol used to exchange information between the routers.

What is half-duplex?

It is the mode of communication between two devices in which flow of data is bi-directional but not at the same time. ie each station can transmit and receive but not at the same time.

E.g walkie-talkies are half-duplex system.

What is full duplex?

It is the mode of communication between two devices in which flow of data is bi-directional and it occurs simultaneously. Here signals going in either direction share the capacity of the link.

E.g. telephone

What is sampling?

It is the process of obtaining amplitude of a signal at regular intervals.

What is Asynchronous mode of data transmission?

It is a serial mode of transmission. In this mode of transmission, each byte is framed with a start bit and a stop bit. There may be a variable length gap between each byte.

What are the advantages of Distributed Processing?

A list of advantages of distributed processing:


-Support Encapsulation

-Distributed database

-Faster Problem solving

-Security through redundancy

-Collaborative Processing

What is bandwidth?

Every signal has a limit of upper range frequency and lower range frequency. The range of limit of network between its upper and lower frequency is called bandwidth.

What is the maximum length allowed for a UTP cable?

The maximum length of UTP cable is 90 to 100 meters.

What is RIP?

RIP stands for Routing information Protocol. It is accessed by the routers to send data from one network to another.

What do you understand by TCP/IP?

TCP/IP is short for Transmission Control Protocol /Internet protocol. It is a set of protocol layers that is designed for exchanging data on different types of networks.

What is netstat?

The "netstat" is a command line utility program. It gives useful information about the current TCP/IP setting of a connection.

What do you understand by ping command?

The "ping" is a utility program that allows you to check the connectivity between the network devices. You can ping devices using its IP address or name.

What is Sneakernet?

Sneakernet is the earliest form of networking where the data is physically transported using removable media.

Explain the peer-peer process.

The processes on each machine that communicate at a given layer are called peer-peer process.

What is a congested switch?

A switch receives packets faster than the shared link. It can accommodate and stores in its memory, for an extended period of time, then the switch will eventually run out of buffer space, and some packets will have to be dropped. This state is called congested state.

What is multiplexing in networking?

In Networking, multiplexing is the set of techniques that is used to allow the simultaneous transmission of multiple signals across a single data link.

What is RSA Algorithm?

RSA is short for Rivest-Shamir-Adleman algorithm. It is mostly used for public key encryption.

What are the different types of networks?

Networks can be divided on the basis of area of distribution. For example:

PAN (Personal Area Network): Its range limit is up to 10 meters. It is created for personal use. Generally personal devices are connected with this network. For example: computers, telephones, fax, printers etc.

LAN (Local Area Network): It is used for a small geographical location like office, hospital, school etc.

HAN (House Area Network): It is actually a LAN that is used within a house and used to connect homely devices like personal computers, phones, printers etc.

CAN (Campus area Network): It is a connection of devices within a campus area which links to other departments of the organization within the same campus.

MAN (Metropolitan Area Network): It is used to connect the devices which spans to large cities like metropolitan cities over a wide geographical area.

WAN (Wide Area Network): It is used over a wide geographical location that may range to connect cities and countries.

GAN (Global Area Network): It uses satellites to connect devices over global are.

What is anonymous FTP?

Anonymous FTP is used to grant users access to files in public servers. Users which are allowed access to data in these servers do not need to identify themselves, but instead log in as an anonymous guest.

What are the main elements of a protocol?

The main elements of a protocol are:

Syntax: It specifies the structure or format of the data. It also specifies the order in which they are presented.

Semantics: It specifies the meaning of each section of bits.

Timing: Timing specifies two characteristics: When data should be sent and how fast it can be sent.

How many layers are in OSI reference model?

There are 7 layers in OSI reference model.

Physical Layer

DataLink Layer

Network Layer

Transport Layer

Session Layer

Presentation Layer

Application Layer

How many layers are in TCP/IP?

There are basic 4 layers in TCP/IP:

Application Layer

Transport Layer

Internet Layer

Network Layer

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