[Solved] In a sliding window protocol with window size 5, the sender transmits packets 1 to 5.... Which packets should the sender retransmit next to maintain correct flow control? | Computer Networks

Computer Networks - Physical and Data Link Layer

In a sliding window protocol with window size 5, the sender transmits packets 1 to 5. Packets 2 and 3 are lost, but packets 1, 4, and 5 are acknowledged. Which packets should the sender retransmit next to maintain correct flow control?

APackets 6 and 7

BPackets 2, 3, and 6

CPackets 2, 3, 4, and 5

DPackets 2 and 3 only

Step-by-Step Solution

Solution:

Step 1: Identify lost packets
Packets 2 and 3 are lost, so they need retransmission.
Step 2: Understand acknowledgments impact
Packets 1, 4, and 5 are acknowledged, so only lost packets 2 and 3 must be resent before sending new packets.
Final Answer:
Packets 2 and 3 only -> Option D
Quick Check:
Retransmit lost packets only = Packets 2 and 3 [OK]

Quick Trick: Retransmit only lost packets, not acknowledged ones [OK]

Common Mistakes:

MISTAKES

Retransmitting already acknowledged packets
Sending new packets before lost ones
Confusing lost packets with acknowledged packets

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More Computer Networks Quizzes

Which packets should the sender retransmit next to maintain correct flow control?

Step 1: Identify lost packets

Step 2: Understand acknowledgments impact

Final Answer:

Quick Check:

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