When you are troubleshooting duplex mismatches, which two errors are typically seen on the fullduplex end? (Choose two.)

Question

Options

• Arunts
• BFCS errors
• Cinterface resets
• Dlate collisions

• A
  88% (15)
• C
  6% (1)
• D
  6% (1)

Explanation

FCS, or File Check Sequence Errors, are one of the more common errors found in a network. When packets are transmitted and received, each contains a File Check Sequence that allows the receiving device to determine if the packet is complete without having to examine each bit. This is a type of CRC, or Cyclical Redundancy Check. Barring a station powering up or down during a transmission, the most common cause of these errors is noise. Network noise can be caused by cabling being located too close to noise sources such as lights, heavy machinery, etc. If a cabling installation is particularly faulty -- such as pairs being untwisted, improper terminations, field terminated patch cables, etc. -- these errors will occur on your network. Poorly manufactured components or minimally compliant components that are improperly installed can compound this issue. Cabling segments that are too long can also cause these errors. Cabling issues, as defined above, or MAC layer packet formation issues (possibly hardware related) cause these errors. A faulty LAN driver can also cause this. Replacement of the driver will correct the latter issue. These errors can also be seen in correlation with RUNT packets or packets that are too short. Noise, however, is the most common cause and can generally be corrected by addressing the cabling channel.

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