Which option lists the modes that are available for configuring UDLD on a Cisco switch?

A.
normal and aggressive

B.
active and aggressive

C.
normal and active

D.
normal and passive

E.
normal and standby

Explanation:
The Cisco-proprietary UDLD protocol monitors the physical configuration of the links between

devices and ports that support UDLD. UDLD detects the existence of unidirectional links. When a unidirectional link is detected, UDLD puts the affected port into
the errdisabled state and alerts the user. UDLD can operate in either normal or aggressive mode.

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/udld.ht ml