Interview Q&A for Networking Freshers

QUESTION 1 –

What is Bandwidth ?

 answer
Bandwidth refers to the maximum data transfer rate of a network.
It measures amount of data transferred over a specific interval of time.
For example- If 1000 bits are transferred in a second . Then the Bandwidth will be 1Kbps.

QUESTION 2 –

What is ARP ?

answer
ARP stands for Address Resolution Protocol.
It is a Broadcast to request MAC-ADDRESS.

QUESTION 3 –

What is PING ?

answer
PING stands for Packet InterNet Gopher.
It is a tool of IP protocol stack which is used to get Network layer i.e. Layer 3 status .

QUESTION 4 –

What are the layers in OSI Model ?

answer

•There are 7 layers in OSI Model

Application
Presentation
Session
Transport
Network
Data Link
Physical

QUESTION 5 –

What is the main difference between TCP & UDP ???

answer
TCP is Connection–oriented data transfer protocol.
It means it is Reliable .
UDP is Connection-less data transfer protocol.
It means it is Un-reliable.

QUESTION 6 –

How to check IP address assigned to a PC or Laptop??

answer
Enter the command prompt  and Use the command - ipconfig


QUESTION 7–

What is a HUB ??

answer
HUB is a Layer 1 device.
It is a Dumb Device.
It just extends the network.
It boost the electrical signal received on the port .

QUESTION 8–

What is a Switch ??

answer
Switch is a Layer 2 device.
It switches between same subnet.
Switch refers L2 information i.e MAC address to take forwarding decision.
 Example – Cisco 2950,2960 etc.


QUESTION 9 –

What is Router ?
answer
 Router is a Layer 3 device.
 It routes between the Networks.
 Router refers L3 information i.e Routing Table to take forwarding decision.
 Example – Cisco 1941,7206 etc.


QUESTION 10 –


What is FTP and which ports does it use ??
answer
FTP stands for File Transfer Protocol.
It is protocol used to transfer data between server and client over network.
It uses port 20 and 21 .

QUESTION 11–

What is a RJ45 ??

answer
RJ45 is the type of the connector used for Ethernet cables.


QUESTION 12–

What is Autonomous System and Autonomous System Number ?

answer
Autonomous System (AS)
It is a group of networks and routers which comes under same administration.
Range of Autonomous System Number (ASN) is 0-65535.
0 & 65535 – Reserved AS.
1 – 64511 – Internet Routing/ Public AS.
64512 – 65534 – Private AS.



QUESTION 13–

What is difference between Public & Private IP address ?

answer
Public IP addresses –
Addresses which are accessible from Internet .

Global IP addresses.

Private IP addresses-

Addresses which are used on internal networks .

Local IP  addresses.

QUESTION 14–

By using which command you can trace an IP address 10.1.1.1 on a Router ?

answer
Traceroute 10.1.1.1

QUESTION 15–

What is the difference between HTTP & HTTPS ?

answer
HTTP stands for Hyper Text Transfer Protocol.

HTTP are set of rules which provides standard way for web browsers and servers to talk with each other.

It is use port 80.

It is insecure (uses plain text)

HTTPS stands for Hyper Text Transfer Secure Protocol.

Secure version of HTTP.

It is use port 443.

It is secure (uses encryption).

QUESTION 16–

Can you tell what are various type of cables ?

answer
Copper cables which includes 2 types of cables

Coaxial Cables & UTP.

&

Fiber Optical Cable

QUESTION 17–

The IP address 203 .120.34.4 belongs to which class ?

answer
Class C

QUESTION 18–

Which is a 3rd Layer in OSI model ?

answer
Network Layer

QUESTION 19–

Can you tell what is MAC address ?

answer
MAC (Media Access Control) uniquely identify a device on the network.

It is a 6 bytes (i.e 48 bits) address.

Its is also known as L2 address

QUESTION 20–

Which Device is used to connect a LAN to a WAN ?

answer
Router (Gateway)

Since It routes between the Networks.

Thanks for the reading the blog !!!!!