In the BGP/MPLS IP VPN network shown in the figure, the administrator plans to use H-Spoke networking to achieve centralized control of VPN traffic at the Hub site. Please match the RT values of the following devices one by one.

Which of the following information can be judged by observing the device indicator light and can also be viewed through the command line? (Multiple choice)

In the OSPF network shown in the figure, the area number has been marked in the figure, where area 1, area 2, and area 3 are all common areas. The IP address of the R5 Loopback0 interface is 10.0.5.5/32, and the interface is enabled with OSPF through the network method. ACL 2000 is configured on all routers, and the matching rules are shown in the figure.

In area 0 of R1, R2, and R3, "filte 2000 export" is configured. Which of the following routers' routing tables do not have a route entry for 10.0.5.5/32? (Multiple choice)

In the network shown in the figure, OSPF protocol is running between R1, R2, and R3, and OSPF BFD feature is turned on. IBGP neighbor relationship is established between R1 and R3 using loopback interface. If GE0/0/1 interface of R2 is shut down, and BGP neighbor relationship is checked on R1, by default, which of the following is the longest time for R1 BGP neighbor relationship to change from Up state to Down state?

When the device logs in to other devices as an SSH client and fails to log in using public key authentication, which of the following are possible reasons? (Multiple choice)