basic networking interview questions

Networking Interview Questions

Networking is the great career and basics about the networking is most important to win any technical interview.

Herewith very basic question and answers on networking.

What is ping? Why you use ping?

PING Stands for Packet InterNet Gopher. PING is used for connectivity checking of any network or any host or device of any or other networks.

Routers are always preferable for routing services. Routers work at which OSI layers?

Router works at network layer for providing routing services between or among several networks.

A gateway works in which layer?

Transport layer of OSI model.

How can you check the connectivity of any network?

By using ping command.

What is a gateway?

A gateway acts a door for the packet to reach the ‘outside’ of the internal network.

What are the differences among router, switch, bridge and hub?

Router, switch, bridge and hub are network devices. Yet there are some differences among them. The main differences are:

·                 Router: A layer 3 device, can work on physical, data and network layer.

·                 Switch: A layer 2 device, can work on data link layer

·                 Bridge: A layer 2 device, can work on data link layer.

·                 Hub: A layer 1device, just a multi-port repeater and works on physical layer

What is the range of class A address?

0-127 is the range of class A address.

Tell an IP which has class C range. Also tell why that IP is an class C address.

·                 IP of Class C: 193.1.1.1

·                 Why this is a class C address: Class C addresses have the range of 192 - 223

Name a device which can operate at physical layer of OSI model.

Hub.

Note: Remember, hub is the device that can work only into the physical layer of OSI model. But switch, router can also be used instead of a hub. So, all the answers hub, switch or router are all correct.

What is the major differences between a router and a switch?

A router can divide the broadcast domain and collision domain. But a switch can only divide the collision domain. Router can communicate among different networks where as the switch can not communicate different networks.

Hub operates at which layers of OSI model? Is it wise to use a hub for huge networks? Why or why not?

·                 Hub  operates at only physical layer of OSI model.

·                 No, it's not so wise to use hub for a huge network.

·                 Hubs can't divide the broadcast domain or the collision domain. So, if we use hubs then there creates huge broadcast domain. When there are huge broadcast, the network gets problem time to time. So, it's not wise to use hubs to support a huge network.