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
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