200-301: Cisco Certified Network AssociateDemo

By Cisco · Question Mode

QuestionQ34

IP Connectivity

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Refer to the exhibit. An administrator receives a call from a branch office about poor application performance for an application hosted at the headquarters.

Ethernet 1 is connected between Router1 and the LAN switch. What identifies the issue?

  • A The MTU is not set to the default value.
  • B There is a duplex mismatch.
  • C The QoS policy is dropping traffic.
  • D The link is over utilized.
Explanation

A duplex mismatch is indicated by the combination of many collisions and CRC/input errors on the Ethernet interface while the link is otherwise up and lightly utilized. On a healthy switched Ethernet link, especially at low load, you would not expect large collision counts; when one side operates half duplex and the other full duplex, the result is excessive collisions, CRC errors, and degraded performance.

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