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Networking Interview Questions

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Why do we use subnet mask? What are its uses?

Asked By: Bashur | Asked On: Aug 25th, 2006

Answered by: Er.Harneet Singh on: Oct 4th, 2014

Sub netting is used to reduce the network traffic.

Answered by: rahul on: Sep 14th, 2013

Subnet mask is used for differentiate the network between network bit and host bit,
by using the subnet mask we know that the how many bit use for network and how many bit use for host

Network delay

Asked By: preetibulbul | Asked On: Dec 29th, 2007

User(s) are complaining of delays when using the network. What would you do?

Answered by: AK on: Oct 1st, 2014

Check traffic on L3 device,Test looping,Utilization on link.Packet drops or CRC / Input error on L3 device.

Answered by: Goutham Shan on: May 27th, 2013

We have to check the MTU , network traffic , loop connections , unwanted NATs , security rules like IPS and gateway

Ip addresses

Asked By: sandeeprana23 | Asked On: Dec 16th, 2008

How many ip addresses we can give to a system that having windows XP professional ? And why ?

Answered by: AK on: Oct 1st, 2014

One IP is required for the communication.We can give more IPs to machine by adding NIC to system.

Answered by: ram on: Sep 20th, 2014

Ip address is used for communication purpose and identify the system.
For one nic we can assign only one ip
it can depend on number of nic cards

What is protocol? How many types of protocols are there?

Asked By: prasadekonex | Asked On: Jul 23rd, 2007

Answered by: adrianna chongnee on: Aug 19th, 2014

The latest version of the Analytics tracking code offers an improved way to track website visitors with Google Analytics. It takes advantage of browser support for asynchronous JavaScript to enhance t...

Answered by: rahul on: Jul 19th, 2014

Protocol is way to communicate between the network.
two types of protocol

1.routable protocol.l
2.routing protocol.

What is difference between public ip and priVATe ip?

Asked By: Goldie | Asked On: Sep 12th, 2006

Answered by: kavali balaji on: Jul 31st, 2014

public ips are a days internet applications became so in order to reduce the public ips usage private ips came into picture...u can find in any office organization u will f...

Answered by: rahul on: Sep 14th, 2013

Public Ip, is Payable IP,which will be use by ISP,like tata,IDIA,which is reserved by iana,

Private IP, is not payable, which is used in network to join the computer with in the network ,just like lan (local area network) or

What is difference between layer 2 switch and layer 3 switch ?

Asked By: Dheeraj Choudhary | Asked On: Mar 13th, 2006

Answered by: rahul on: Jul 19th, 2014

Layer 2 Switch means it is able to worked both the layer 1 and layer 2

Layer 3 Switch means it is able to worked with both layer 1 and layer 2 as well as layer 3 also

layer 3 switch means like Router,which will be route the traffic.

layer 2 switch means like switch.

Answered by: Madhu reddy on: Jul 14th, 2014

L3 switch only can do routing at LAN area when we need routing at WAN area we need Router .

Network layer

Asked By: Mosupi | Asked On: Sep 30th, 2009

Is the network layer address important to a transparent learning bridge? Why or why not?

Answered by: Asif Shaikh on: May 25th, 2014

Yes is required because technology is facilitated communication they not communicate own some body have to use technology ,the user use technology with help of Software , in IP upper layer protocol stack have many software, means Ip address bind with technology to use.

Answered by: Rahul on: Mar 20th, 2013

Network Layer is Third layer of OSI Modal, it Performs two main functions - Routing, Logical Addressing
Routing is Selection of best available path in the network.

What is the difference between control plane and data plane?

Asked By: anooanu | Asked On: Jan 15th, 2013

Answered by: Asif Shaikh on: May 25th, 2014

control plane & Data plane is resources of device , they distinguish into two part control plane & data plane & reserved 50 to 50% bandwidth for that, normally control plane is carry control packet li...

Answered by: Yuvrajsingh on: Feb 13th, 2013

Control panel : Consists of the Windows Applets.
Data Plane : In routing, it is usually referred as Data frame, which consists of the various modules.

Negotiation in network protocols

Asked By: Unkle_Ravi | Asked On: Feb 8th, 2009

What does "negotiation" mean while discussing the network protocols? Is "negotiation"' connection oriented? Give an example.

Answered by: krrish on: Apr 29th, 2014

Negotiation in terms of network protocols can be done on established connection. the sender and receiver will make some negotiations on parameters which are used to transfer the data between both of t...

Routing question

Asked By: 99kash99 | Asked On: Aug 30th, 2013

You attempt to ping a machine at ip and get nothing back. your host ip is: with on a /24 subnet the router has two interfaces (eth0) and (eth1) the remote machine has two interfaces (eth0) and (eth1) the routing table for...

Answered by: sonux on: Apr 10th, 2014

It is a default gateway configuration problem on remote computer.

Answered by: Enkidu on: Sep 4th, 2013

Destination Gateway Genmask Flags Metric Ref Use Iface UG 0 0 0 eth0 U 1000 0 0 eth1 What might be the problem an...

Higher order bits in ip class

Asked By: Arfat | Asked On: Dec 5th, 2013

Whats the use of higher-order bits in ip class addressing ? Like for class "a" its 0 class "b" its "10" and so on

Answered by: hemanshu trivedi on: Mar 1st, 2014

Higher order bits are use to identify the default class of the subnet

How is EIgrp better than ospf?

Asked By: Sunit Agarwal | Asked On: Jul 5th, 2007

EIgrp is better than osPF

Answered by: rahul on: Feb 7th, 2014

EIGRP, support unequal cost load balancing,it keep a backup path,this feature is not AVAILABLE IN OSPf

Answered by: Rahul on: May 11th, 2013

Eigrp creating secondary path or route for backup,convergent is fast.


Asked By: manojshetty | Asked On: May 31st, 2012

Can you define a computer network and also define the types of network.

Answered by: RAHUL on: Feb 7th, 2014

Network, is a joining of two or more computer,in order to shared resources,
like hardware and software.
Type of network,

Answered by: raju kumar gupta on: Jan 11th, 2014

When the two or more computer is communicate to each other they can share data,folder and hardware resources like printer scanner fax is called network .there are many type of network from geographical area lan wan man pan etc.

Pe to pe is not reachable

Asked By: rakesh nair | Asked On: Feb 7th, 2014

What might be the reason if pe to pe is not reachable but ce to ce is reachable in mpls vpn

In tcp/ip udp is connection less , why?

Asked By: raju mahana | Asked On: Sep 30th, 2006

Answered by: rahul on: Sep 12th, 2013

Udp is connectionless network is used for small network,which less secure,no acknowledgement

Answered by: Goutham Shan on: May 27th, 2013

For fast transmission UDP is used as it does not require any ACK .

What is the printer registry file name?

Asked By: ramraje | Asked On: Mar 4th, 2011

Answered by: Manasi Suthar on: Sep 11th, 2013


Answered by: sankarpalla on: May 20th, 2011


What are the network monitoring tools? Like what tools do you use to monitor network connections?

Asked By: Ambi | Asked On: Oct 2nd, 2006

Answered by: Deepan chakravarthi on: Jun 18th, 2013

Network monitoring tools are like which used to capture the network traces and packets. In that case there are several tools like, wire shark, ethereal etc.,

Answered by: Rahul Bhagare on: Apr 9th, 2013

Network Monitoring tools means, If your organization havinG Lease line like TaTa,Reliance etc,You prepared maintenance or monitor your lease line network through tools,

Network Monitoring tools E.G Whats UP Gold etc or Found on Internet.

What is a dns ? How it works ?

Asked By: Amol | Asked On: Mar 24th, 2006

Answered by: alok on: Jun 4th, 2013

DNS is a server for resolving the name or we can say name to IP address of the system in domain.

Answered by: Rahul on: May 11th, 2013

DNS means DOMAIN NAME SYSTEM,IT,works for converting name to IP address,and IP address to name,Conversion needs for user friendliness because user is difficult to keep in mind IP address of web sit...

If in a company with 80 computers with wireless network .All are using wireless internet.What is bandwidth per user?

Asked By: vijendra singh | Asked On: May 10th, 2006

Answered by: Goutham Shan on: May 27th, 2013

Wireless is always half duplex , unlike the LAN which is mostly full duplex now . You cant expect full speed from wireless that you are getting from your ISP . Adding to that its your wireless router specific also .

Answered by: Rahul on: Apr 9th, 2013

We cant calculate the bandwidth,of each PC,because ,if your lease line 100 mbps,depend communication is synchronous or asynchronous,depends on trafic,may be collision occurs,its totally depends on sp...

If printing is given print from two different computers in a network which one will be preferrenced first. Pcs are in domain first.

Asked By: sonimanish78 | Asked On: Jul 14th, 2007

Answered by: Goutham Shan on: May 27th, 2013

Printer sends SYN ACK which is the reply to the computer which sends the SYN first and then after the ACK from the computer it starts printing . In simple English FIFO

Answered by: Rahul on: Apr 9th, 2013

Depends on Priority given to the user or workstation,or not the priority assign then which workstation get media
free or which will hit the print first

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