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In a stop-and-wait protocol, the sender retransmits a frame even though the receiver has already received it. What could be the reason?

medium📝 Analysis Q7 of 15
Computer Networks - Physical and Data Link Layer
In a stop-and-wait protocol, the sender retransmits a frame even though the receiver has already received it. What could be the reason?
AAcknowledgment was lost or delayed
BFrame size is too large
CSender window size is greater than one
DReceiver is sending negative acknowledgments
Step-by-Step Solution
Solution:

  1. Step 1: Understand retransmission cause

    Sender retransmits if it does not receive ACK in time.

  2. Step 2: Identify why ACK might be missing

    ACK loss or delay causes sender to think frame was lost.

  3. Final Answer:

    Acknowledgment was lost or delayed -> Option A

  4. Quick Check:

    Lost ACK causes retransmission [OK]
Quick Trick: Lost ACK triggers retransmission [OK]
Common Mistakes:
MISTAKES
  • Blaming frame size
  • Confusing window size in stop-and-wait
  • Assuming negative ACKs cause retransmission

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