A.Ingress LER forwards packets based on label.

B.Core LSR forwards packets based on label.

C.Egress LER forwards packets based on IP routing table.

D.Core LSR forwards packets based on IP routing table.

A.When a DIS fails, the backup DIS will take over.

B.The IS-IS router with the highest priority in the whole broadcast network will be elected as the DIS.

C.When the priority is the same, the router with higher IP address will be elected as the DIS.

D.DIS election is configured manually.

A.To use different routing protocols In the backbone network for afferent VPN.

B.To allocate unique RT for each VPN.

C.To maintain separate VRF lor different VPN.

D.To allocate different LSP for each VPN.

E.To allocate unique RD for each VPN.

A.LAN switch can still operate normally even when loop exists.

B.LAN switch can modify the data field of the forwarded frame when necessary.

C.LAN switch can detect loop according to the contents of the packet.

D.LAN switch is transparent for user, it does not modify the data field of the forwarded frame.

A.True

B.False