Which three modes are valid PfR monitoring modes of operation? (Choose three.)
A.
route monitor mode (based on BGP route changes)
B.
RMON mode (based on RMONv1 and RMONv2 data)
C.
passive mode (based on NetFlow data)
D.
active mode (based on Cisco IP SLA probes)
E.
fast mode (based on Cisco IP SLA probes)
F.
passive mode (based on Cisco IP SLA probes)
CD are obvious,
E: fast mode
This mode generates active probes through all exists continuously at the configured probe frequency. This differs from either active or both modes in that these modes only generate probes through alternate paths (exits) in the event the current path is out-of-policy.
With Fast Reroute, the characteristics of the alternative paths are always known, allowing immediate use as required. If unreachable is determined to be out-of-policy for the current exit, the alternate exit that is in policy is selected as the new current exit.