642-811 Building Cisco Multilayer Switched Networks (BCMSN)
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Demo Question 5.
Three EliteCertify switches are connected as shown below: Switch EliteCertify 3 is configured with UplinkFast. If L2 were to fail, how much time will pass before Switch EliteCertify 3 activates the port connection to L3?
A. 1-5 seconds
B. 15-20 seconds
C. 30-35 seconds
D. 45 seconds
E. 60 seconds
F. None of the above.
Display Answer
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Answer: A
Explanation: If SwitchC detects a link failure on the currently active link L2 (a direct link failure),
UplinkFast unblocks the blocked port on SwitchC and transitions it to the forwarding
state immediately, without transitioning the port through the listening and learning states.
This switchover takes approximately one to five seconds.
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