Which option is a possible cause for an errdisabled interface?

Which option is a possible cause for an errdisabled interface?
A . routing loop
B . cable unplugged
C . STP loop guard
D . security violation

Answer: D

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/en/US/tech/tk389/tk621/ technologies_tech_note09186a00806cd87b.shtml