GATE|GATE-CS-2014 PAPER-03|Question4
In the following pairs of OSI protocol layer/sub-layer and its functionality,the incorrect pair is
(A) Network layer and routing.
(B) Data link layer and bit synchronization.
(C)Transport layer and end to end process communication.
(D) Medium access control sub-layer and channel sharing.
Answer (B)
One of the main functionality of network layer is routing So option(A) is correct.
Bit synchronization is always handled by physical osi model but not data link layer So option(B) is incorrect.
End to End process communication is handled by transport layer So option(c) is correct.
MAC sub layer have 3 types of protocol(Random,controlled and channelized access).
Layer of OSI model
Application layer
presentation layer
Transport layer
Session layer
Network layer
Data link layer
Physical layer.
Each layer has own responsibility.For example routing is the responsibility of network layer.
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