Which flag in a configuration BPDU instructs all switches to shorten their bridge table aging process
from the default 300 seconds to the current forward delay value?
A.
topology change bit
B.
topology change acknowledgment bit
C.
priority bit
D.
max-age bit
The Root Bridge continues to set the Topology Change flag (TCN bit) in all Configuration BPDUs
that it sends out for a total of Forward Delay + Max Age seconds (default = 35 (20+15) seconds).
This flag instructs all bridges to shorten their MAC address table (Bridge table) aging process from
the default value of 300 seconds to the current Forward Delay value of the bridge (default=15
seconds).
The TCA flag is set by the upstream bridge to tell the downstream bridges to stop sending TCN
BPDUs. The TC flag is set in configuration BPDU by the Root Bridge to shorten the bridge table
age-out period from default 300 seconds to Forward Delay seconds.
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