Part of the configuration of R1 is as follows. Which of the following statement about IS-IS on R1 is correct? (Multiple choice)

A router is running OSPF, and the output information is as shown in the figure. Which of the following statements is correct?

A park deployed IPv6 for business testing. There are 4 routers (R1, 22, R3 and R4) in this network, running OSPFv3 to realize the interconnection of IPv6 network. There is a new router R5 that needs to be connected to the network for testing. An engineer introduced a direct route in the OSPFvV3 process of R4 to realize that the devices in the campus network can access the GE0/0/1 port address of R5. Which of the following descriptions of the scene are correct? (Multiple choice)

If the display current-configuration can reach the IS-IS configuration, but there is no IS-IS configuration in the display saved-configuration, what does it mean?

OSPF is deployed in a small and medium-sized network. When checking the routing table of a certain device, it is found that there are only direct routes. Which operation is unlikely to cause the fault?