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A sliding window protocol implementation is not sliding the window forward after receiving acknowledgments. What is the most likely cause?

medium📝 Analysis Q6 of 15
Computer Networks - Physical and Data Link Layer
A sliding window protocol implementation is not sliding the window forward after receiving acknowledgments. What is the most likely cause?
AReceiver is sending duplicate frames
BSender is not updating the base pointer after ACK
CWindow size is set to zero
DTimeout interval is too short
Step-by-Step Solution
Solution:

  1. Step 1: Identify sliding window mechanism

    The base pointer marks the start of the window and moves on ACK receipt.

  2. Step 2: Diagnose why window doesn't slide

    If base pointer isn't updated, window stays fixed despite ACKs.

  3. Final Answer:

    Sender is not updating the base pointer after ACK -> Option B

  4. Quick Check:

    Window slides by updating base pointer [OK]
Quick Trick: Update base pointer to slide window [OK]
Common Mistakes:
MISTAKES
  • Blaming receiver for sender's window issue
  • Confusing window size with base pointer
  • Ignoring ACK processing

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