The Gateway to Computer Science Excellence
+20 votes

In the following pairs of OSI protocol layer/sub-layer and its functionality, the INCORRECT pair is 

  1. Network layer and Routing
  2. Data Link Layer and Bit synchronization
  3. Transport layer and End-to-end process communication
  4. Medium Access Control sub-layer and Channel sharing
in Computer Networks by Veteran | 3k views

6 Answers

+25 votes
Best answer
  1. One of the main functionality of Network Layer is Routing. So, option (A) is CORRECT.
  2.  Bit Synchronization is always handled by Physical Layer of OSI model but not Data Link Layer. So, option (B) is INCORRECT.
  3. End – to – End Process Communication is handled by Transport Layer. So, option (C) is CORRECT.
  4. MAC sub layer have $3$ types of protocols (Random, Controlled and Channelized Access).

So, option (B) is incorrect pair.

by Active
edited by
Data link layer is for Framing, Flow and Error Control, Hop to Hop delivery

DLL has two sub-layer

1. LLC - It deals with error control, flow control

2. MAC - It deals with error control, physical addressing, framing, access control(channel sharing)

+31 votes

Answer is B) Data Link Layer & Bit Synchronization.

Because, Data Link Layer is associated with Frame Synchronization, and not Bit Synchronization.

by Active
+5 votes
Option B

 Data Link Layer and Bit synchronization

In data link layer framing is counted and syn it count bit by HCDL protocol wgich is out of syllabus.
by Boss
+5 votes
1) Yes, Network layer does Rotuing
2) No, Bit synchronization is provided by Physical Layer
3) Yes, Transport layer provides End-to-end process 
4) Yes, Medium Access Control sub-layer of Data Link Layer provides
   Channel sharing. 
by Boss
+2 votes
Options B is right because bit synchronisation is done in physical layer
by Active
0 votes
B option
by Boss

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
52,217 questions
59,907 answers
118,146 users