Which of the following statements about the MP_REACH_NLRI attribute of BGP4+ is correct? (Multiple choice)

When MPLS is deployed in the network and the network layer protocol is IP, the route corresponding to the FEC must exist in the IP routing table of the LSR, otherwise the label forwarding entry of the FEC will not take effect.

Part of the configuration of R1 is as follows. Which statement about OSPF on R1 is correct?

In the LDP session establishment process, the active party will first send the lnitialization information for parameter negotiation, and if the passive party does not accept the negotiation parameters, it will send _____ .

There is the concept of forwarding equivalence class FEC in MPLS, which of the following description is wrong? (Multiple choice)