A.SA messages can be transmitted only between RPs in different PIM networks.

B.The SA message contains the multicast source and group information

C.The router checks the RPF after receiving SA messages.

D.The router uses the SA cache to store SA messages.

A.MPLS LDP is enabled on the outbound interface of the public network.

B.The interface that is bound to a CCC connection is physically Up.

C.MPLS is enabled on the outbound interface of the public network.

D.If an outbound interface is specified in CCC configuration, the outbound interface is Up.

E.If a next hop is specified in CCC configuration, a route to the next hop is available.

A.An ASBR is required to store all VPN routes, which challenges the performance of the ASBR.

B.The inter-AS scheme in Option B is an inherent feature of VPN.

C.An ASBR does not store VPN routes but sends them out as label data.

D.VRFs matching PEs must be configured on the ASBR.

A.When the VSI uses Ethernet for encapsulation, the VLAN tag in a packet sent from a CE to its nearby PE must be reserved when the packet reaches a VPLS domain, and whether the packet needs to be encapsulated at the egress of the VPLS domain must be determined based on the encapsulation mode used on the peer AC.

B.When the VSI uses Ethernet for encapsulation, the VLAN tag in a packet sent from a CE to its nearby PE must be removed when the packet reaches a VPLS domain, and whether the packet needs to be encapsulated at the egress of the VPLS domain must be determined based on the encapsulation mode used on the peer AC.

C.When the VSI uses Ethernet for encapsulation, a packet sent from a CE to its nearby PE must be added with a VLAN tag when the packet reaches a VPLS domain, and whether the packet needs to be encapsulated at the egress of the VPLS domain must be determined based on the encapsulation mode used on the peer AC.

D.When the VSI uses Ethernet for encapsulation, a packet sent from a CE to its nearby PE does not need to be added with a VLAN tag when the packet reaches a VPLS domain, and whether the packet needs to be encapsulated at the egress of the VPLS domain must be determined based on the encapsulation mode used on the peer AC.

A.In BFD for MPLS LSP, LSP Ping is used to negotiate the identifier and parameters of a BFD session.

B.An MPLS LSP may be unidirectional .If BFD packets are transmitted along an MPLS LSP in the forward direction., these packets may be forwarded over IP in the reverse direction. Then the forward and reverse paths of a packet may be different As a result, when a fault occurs on the reverse path, BFD detects and reports the fault even if the MPLS LSP is normal.

C.BFD for MPLS LSP detects faults only on the forwarding plane. LSP Ping, however, can not only detect faults on the forwarding plane, but also find out inconsistencies between the forwarding plane and the control plain- Therefore, they are often combined for a better fault detection solution.

D.If MPLS LSPs work in load balancing mode, a BFP session should be triggered on each LSP in principle. Only one BFD session. however, can be initialed for load-balancing MPLS LSPs to an intermediate node In this case, the forwarding path ol BFD packets may be different from what expected. As a result may be reported or missed.