Refer to the exhibit. Given this output for SWITCH3, what should the network administrator’s next
action be?

A.
Check the trunk encapsulation mode for SWITCH3’s fa0/1 port.

B.
Check the trunk encapsulation mode for SWITCH1’s fa0/2 port.

C.
Check the duplex mode for SWITCH3’s fa0/1 port.

D.
Check the duplex mode for SWITCH1’s fa0/2 port.

Explanation:
When operating at full-duplex, FCS, cyclic redundancy checks (CRC), alignment errors, and runt
counters are probably minimal. If the link operates at full-duplex, the collision counter is not active.
If the FCS, CRC, alignment, or runt counters increment, check for a duplex mismatch. Duplex
mismatch is a situation in which the switch operates at full-duplex and the connected device
operates at half-duplex, or the other way around. The result of a duplex mismatch is extremely
slow performance, intermittent connectivity, and loss of connection. Other possible causes of data
link errors at full-duplex are bad cables, a faulty switch port, or NIC software or hardware issues.