ALLInterview.com :: Home Page KalAajKal.com
 Advertise your Business Here     
Browse  |   Placement Papers  |   Company  |   Code Snippets  |   Certifications  |   Visa Questions
Post Question  |   Post Answer  |   My Panel  |   Search  |   Articles  |   Topics  |   ERRORS new
   Refer this Site  Refer This Site to Your Friends  Site Map  Bookmark this Site  Set it as your HomePage  Contact Us     Login  |  Sign Up                      
tip   To Refer this Site to Your Friends   Click Here
Google
 
Categories >> Software >> Networking >> Networking-Protocols >> TCP-IP
 
 
 
Question
what is the difference between layer 2 and layer 3 qos
 Question Submitted By :: Guest
I also faced this Question!!     Rank Answer Posted By  
 
Answer
Well, none of the above answers talk about QOS,

L2-QOS:
-------
It is clear that L2 is at MAC layer. In case of MAC level 
forwarding such as Bridge connction and a quality of 
service need to be assured, The following methods can be 
used:

1) MAC filtering (avoiding unnecessary traffic coming from 
known MAC sources)
2) VLAN & COS: VLAN will ensure that the traffic is 
classified based on various parameters like MAC address, 
incoming port, etc... COS: Class Of Service is a filed in 
VLAN header. This will be used to prioritize traffic. Later 
a QOS scheduler can use the COS filed to qualify the 
traffic in to different QOS queues.

L3 - QOS
--------

L3 QOS is required for IP level classification. 
Classification can be achieved by Diffserv implementations 
that takes many IP parameters in to consideration in 
prioritizing traffic. This priority can be set in TOS field 
of IP header. This TOS will later be used by Scheduling 
process to achieve QOS.
 
0
Trilokchand Kilari
 
View All Answers
 
 
 
 
 
   
Copyright Policy  |  Terms of Service  |  Help  |  Site Map 1  |  Articles  |  Site Map  |   Site Map  |  Contact Us interview questions urls   External Links 
   
Copyright © 2007  ALLInterview.com.  All Rights Reserved.

ALLInterview.com   ::  Forum9.com   ::  KalAajKal.com