A switch which was connected with 2 fiber cable attached to another switch. After initial boot (I think another switch), one of the link get error-disable or shutdown.
What was the reason for that?
A. Due to STP.
B. Due to UDLD aggressive mode, the other switch didn’t get the BPDU message.
C. Due to UDLD normal mode, the other switch didn’t get the BPDU message.
D. Due to port security configuration.
Correct answer is B.
refer to https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/10591-77.html
How is it possible for the switch to stop receiving BPDUs while the port is up? The reason is unidirectional link. A link is considered unidirectional
A. and C. do not shut down ports
D. port security does not seem to kick in yet (after initial boot)
B. is the best answer
refer to https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/10591-77.html
How is it possible for the switch to stop receiving BPDUs while the port is up? The reason is unidirectional link. A link is considered unidirectional
A. and C. do not shutdown ports.
B. is the best answer
D. The question says “initial boot”, port security does not seem to kick in yet.
UDLD Aggressive mode can set a port to errdisable
Port Sec can shutdown a port
Answer is B or D….depending on what the question wants
The Answers are confusing
UDLD has nothing to deal with BPDUs (STP feature)
STP do no set the port to err-disabled but Loop Inconsistency
STP can not set ports to “err-disabled”.
udld aggressive can set port to “err-disabled”
no process cann set ports to shutdown.
It’s Question : link get error-disable “or” shutdown. First time, my answer is A too but if it incorrect please tell me back.