What are two symptoms of duplex mismatch? (Choose two.)

Question

Options

• APing does not return from one direction versus the other direction.
• BCommunication is slow and locks up.
• CSpeed is seen equally slow in both directions.
• DThe half-duplex side sees frame sequence errors or runt frames.
• EThe full-duplex side sees CRC errors.

• A
  13% (5)
• B
  77% (30)
• C
  5% (2)
• E
  5% (2)

Explanation

A duplex mismatch occurs when one side of a link is set to half-duplex and the other to full-duplex. The full-duplex side transmits continuously without waiting, while the half-duplex side uses CSMA/CD collision avoidance - this causes the half-duplex device to detect its own transmissions as collisions, producing runt frames and frame sequence errors (D). The contention and retransmissions create severe slowness and connection lockups (B), since throughput degrades dramatically under constant collision conditions.

Why the distractors are wrong:

• A - Duplex mismatch degrades traffic in both directions; it doesn't create a one-way ping failure (that points to routing/firewall issues).
• C - Speed is not equally slow in both directions. Full-duplex side can still push data out freely; the asymmetry is a key characteristic of this problem.
• E - It's the half-duplex side that sees CRC errors and runts, not the full-duplex side. The full-duplex side sees late collisions instead.

Memory tip: Think "half suffers" - the half-duplex device bears the brunt of the problem with frame errors and runts, while both sides share the pain of slowness.

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