Which optional feature of an Ethernet switch disables a port on a point-to-point link if the port
does not receive traffic while Layer 1 status is up?

A.
BackboneFast

B.
UplinkFast

C.
Loop Guard

D.
UDLD aggressive mode

E.
Fast Link Pulse bursts

F.
Link Control Word

Explanation:
UDLD aggressive mode is disabled by default. Configure UDLD aggressive mode only on
point-to-point links between network devices that support UDLD aggressive mode. With
UDLD aggressive mode enabled, when a port on a bidirectional link that has a UDLD
neighbor relationship established stops receiving UDLD packets, UDLD tries to reestablish
the connection with the neighbor. After eight failed retries, the port is disabled.