In Ethernet networks, duplex mismatches will lower performance. Which error statistics can be seen if a duplex mismatch is present?

Question

Options

• Acollisions on the full-duplex side; runts on the half-duplex side
• Bcollisions on the full-duplex side; collisions on the half-duplex side
• Ccollisions on the half-duplex side; framing errors on the full-duplex side
• Dcollisions on the half-duplex side; giants on the full-duplex side

• A
  4% (1)
• B
  17% (4)
• C
  70% (16)
• D
  9% (2)

Explanation

On an Ethernet connection, a duplex mismatch is a condition where two connected devices operate in different duplex modes, that is, one operates in half duplex while the other one operates in full duplex. This results in the full-duplex side receiving an incomplete frame with CRC error or a runt frame. It does not detect any collision since CSMA/CD is disabled on the full-duplex side. As a result, when both devices are attempting to transmit at (nearly) the same time, the packet sent by the fullduplex end will be discarded and lost due to an assumed collision and the packet sent by the half duplex device will be delayed or lost due to a CRC error in the frame.

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