The Gateway to Computer Science Excellence
First time here? Checkout the FAQ!
+2 votes
asked in Computer Networks by (471 points) | 273 views

1 Answer

+1 vote
Error Control -

         Why error control in Transport layer when it is in DLL  - As DLL is visited twice and network layer only once at every router. Sequence in which these are visited at the routers is  DLL -> Network Layer -> DLL. So if any error occured at the network layer like modification of packet or packet lost due to malfunction of router or any other reason, then these errors will not be detected by DLL.


         Why error control in DLL when it is in Transport layer -  If error will be detected at the transport layer of destination,than whole packet will be sent again.This might result in wastage of computing time and bandwidh to a much larger extent then to detect error in the frame in DLL of  the upcoming node in the route just after the error has occured. So only the garbled frames(not the whole packet) will be sent again and only for the one hop.


Flow Control -

         Context of flow control at DLL and transport layer is completely different. Flow control at DLL includes frames which might not be from one process or even from one node.There may be buffer overflow at DLL of intermediate routers with or without having buffer overflow at destination machines transport layer.
answered by (21 points)

Related questions

Quick search syntax
tags tag:apple
author user:martin
title title:apple
content content:apple
exclude -tag:apple
force match +apple
views views:100
score score:10
answers answers:2
is accepted isaccepted:true
is closed isclosed:true

46,668 questions
51,139 answers
66,556 users