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A network engineer tries to update the error detection method in Layer 4 but notices the network stops working. What is the most likely cause?

medium📝 Analysis Q6 of 15
Computer Networks - OSI and TCP/IP Models
A network engineer tries to update the error detection method in Layer 4 but notices the network stops working. What is the most likely cause?
ALayer 1 was changed accidentally
BLayer 4 does not perform error detection
CThe new method is incompatible with Layer 3 interfaces
DLayer 2 handles error detection, not Layer 4
Step-by-Step Solution
Solution:

  1. Step 1: Understand layer interface importance

    Each layer communicates with adjacent layers using defined rules.

  2. Step 2: Analyze update impact

    If the new error detection method breaks Layer 4's interface with Layer 3, communication fails.

  3. Final Answer:

    The new method is incompatible with Layer 3 interfaces -> Option C

  4. Quick Check:

    Interface mismatch = Network failure [OK]
Quick Trick: Keep interfaces compatible when updating layers [OK]
Common Mistakes:
MISTAKES
  • Assuming Layer 4 does not do error detection
  • Blaming unrelated layers

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