Q23.Marks: +2.0UGC NET Paper 2: Computer Science 26th Nov 2021
Match List I with List II
List I
List II
A.
Data Link Layer
I.
True end‐to‐end layer
B.
Network Layer
II.
Token Management
C.
Transport Layer
III.
Produce billing information
D.
Session Layer
IV.
Piggybacking
Choose the correct answer from the options given below :
1.A ‐ IV, B ‐ III, C ‐ I, D ‐ II✓ Correct
2.A ‐ IV, B ‐ II, C ‐ I, D ‐ III
3.A ‐ II, B ‐ III, C ‐ I, D ‐ IV
4.A ‐ IV, B ‐ I, C ‐ III, D ‐ II
Solution
The correct answer is option (1)
A ‐ IV, B ‐ III, C ‐ I, D ‐ II
Key Points
Piggybacking is a technique for attaching acknowledgment to a data packet that is being sent out. When a data frame is received in two-way communication, the receiver pauses before sending the control frame back to the sender.
The receiver waits for the next data packet to arrive from its network layer. This outgoing data frame is then linked to the delayed acknowledgment. Piggybacking is a technique for temporarily delaying acknowledgment so that it can be attached to the next outgoing data frame.
The network layer allows variable-length network packets to be transferred from a source to a target host through one or more networks.
The transport layer provides a complete end-to-end communication solution. The transport layer is used by TCP/IP to efficiently regulate communications between two hosts.
The Session Layer acts as a dialogue controller, allowing computers to communicate in either half-duplex or full-duplex mode. This layer is also in charge of token management, which prevents two users from accessing or performing the same essential operation at the same time.
