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1

GATE CSE 2014 Set 3

MCQ (Single Correct Answer)
In the following pairs of OSI protocol layer/sub-layer and its functionality, the INCORRECT pair is
A
Network layer and Routing.
B
Transport layer and End-to-end process communication.
C
Data Link Layer and Bit synchronization.
D
Medium Access Control sub-layer and Channel sharing.

Explanation

Data link layer has error control,flow control,access control and framing as functionalities. Bit synchronization is a part of physical layer.
2

GATE CSE 2013

MCQ (Single Correct Answer)
Assume that source S and destination D are connected through two intermediate routers labeled R. Determine how many times each packet has to visit the network layer and the data link layer during a transmission from S to D.
A
Network layer – 4 times and Data link layer – 4 times
B
Network layer – 4 times and Data link layer – 3 times
C
Network layer – 4 times and Data link layer – 6 times
D
Network layer – 2 times and Data link layer – 6 times

Explanation

From above given diagram, it's easily visible that packet will visit network layer 4 times(once at each node [S, R, R, D]) and packet will visit Data Link layer 6 times (One time at S and one time at D, then two times for each intermediate router R as data link layer is used for link to link communication.)

Once packet reaches to R(router) then it goes up from physical layer to DLL to Network layer and when packet coming out of router in order from Network layer to DLL to Physical layer.

Remember: You can see, At router there are two Physical Layer and two Data link Layer.The reason is,on one side of the router there could be one network and other side of the router there could be other network.

For ex.- One side there could be Ethernet and on other side there could be Token Ring.So,One DLL will understand the language of Ethernet and other DLL will convert the packet so that it could be read by the Token Ring.

That is why two DLL and two PL is needed at the Router.

3

GATE CSE 2012

MCQ (Single Correct Answer)
The protocol data unit (PDU) for the application layer in the Internet stack is
A
Segment
B
Datagram
C
Message
D
Frame

Explanation

The PDU for Datalink layer, Network layer, Transport layer and Application layer are frame, datagram, segment and message respectively.
4

GATE CSE 2010

MCQ (Single Correct Answer)
Which one of the following is not a client-server application?
A
Internet chat
B
Web browsing
C
E-mail
D
Ping

Explanation

Ping is the name of a standard software utility, used to test connectivity either between client-client or client-server.
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Questions Asked from Concepts of Layering

On those following papers in Marks 1
Number in Brackets after Paper Indicates No. of Questions
GATE CSE 2022 (1)
GATE CSE 2014 Set 3 (1)
GATE CSE 2013 (1)
GATE CSE 2012 (1)
GATE CSE 2010 (1)
GATE CSE 2004 (1)

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