A.TE tunnels that are configured with the FRR option cannot be used as backup tunnels.
B.TE tunnels that are configured with the FRR option can be used as backup tunnels.
C.The backup tunnel that is used to protect a physical interface must have a valid IP address configured.
D.Interfaces must use MPLS global label allocation.
E.The source IP address of use backup tunnel and the merge point （MP） should not be reachable.

A.CRS-1 SMU can be applied to a different platform， and vice versa
B.SMU is an executable code for running a process or libraries that are shared between the different processes
C.SMUs for each release are individually downloadable from Cisco.com and come in the form of a tar ball
D.SMUs provide software fixes for critical network down and qualification blocking issues Therefore，every software defect has a corresponding SMU
E.SMUs are release-specific. If an issue affects multiple platforms or releases，an SMU is built separately for each release and each platform

A.L2TPv3 Frame Relay support includes only 32-bit DLCI addressing
B.L2TPv3 sessions do not support Frame Relay LMI interworking
C.Multipoint DLCI is not supported
D.To use DCE or a Network-to-Network Interface on a Frame Relay port， you must configure the frame-relay switching command
E.L2TPv3 feature does not support Frame Relay extended addressing

A.To enable OSPF authentication in a network， OSPF area 0 authentications must be enabled first
B.The payload of OSPF version 3 packets contains no authentication information
C.OSPF version 3 supports Advanced Encryption Standard
D.OSPF version 3 uses router ID as a key to encrypt OSPF hello packets
E.OSPF MD5 authentication uses TCP， and Plan Test authentication uses UDP

A.Traffic for a bidirectional group flows along the one shared tree and simultaneously utilizes multiple paths in a redundant network topology
B.It does not require any traffic signaling in the protocol
C.Membership to a bidirectional group is signaled using explicit Join messages
D.It maintains source-specific forwarding state
E.It reduces memory， bandwidth， and CPU requirements