A router Network LSA is shown in the figure. Which of the following statements is correct? (Multiple choice)

The IS-IS neighbor between R3 and R1 is not established. According to the information in this figure, what is the possible cause?

The output information of a router is as follows. Which of the following reasons cause the OSPF adjacency relationship to fail to be established normally? (Multiple choice)

In an MPLS domain, LSR can be divided into Ingress LSR, Transit LSR and Egress LSR according to the way the LSR processes data. For the same FEC, a certain LSR can be the Ingress LSR of the FEC or the Transit LSR of the FEC.

In order to speed up the perception of link failures in the IS-IS network, IS-IS can be linked with BFD.