Which condition does the err-disabled status indicate on an Ethernet interface?

Question:
Which condition does the err-disabled status indicate on an Ethernet interface?

• There is a duplex mismatch.
• The device at the other end of the connection is powered off.
• The serial interface is disabled.
• The interface is configured with the shutdown command.
• Port security has disabled the interface.
• The interface is fully functioning.

Explanation: There are various reasons for the interface to go into errdisable. The reason can be:

+ Duplex mismatch
+ Port channel misconfiguration
+ BPDU guard violation
+ UniDirectional Link Detection (UDLD) condition
+ Late-collision detection
+ Link-flap detection
+ Security violation
+ Port Aggregation Protocol (PAgP) flap
+ Layer 2 Tunneling Protocol (L2TP) guard
+ DHCP snooping rate-limit
+ Incorrect GBIC / Small Form-Factor Pluggable (SFP) module or cable
+ Address Resolution Protocol (ARP) inspection
+ Inline power

Reference: http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/69980-errdisable-recovery.html

Therefore in fact there are two correct answers in this question, which are “There is a duplex mismatch” and “Port security has disabled the interface” but maybe you should choose the port security answer as it is the most popular reason.

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