In the IS-IS network shown in the figure, R1 introduces the default route through the "default- route-advertise always level-1" command. Which of the following descriptions are correct?
(Multiple choice)

In the network shown in the figure, the DHCP Server function is enabled on the R2 GE0/0/0 interface, and the address pool is the interface address pool. The R1 GE0/0/0 and GE0/0/1 interfaces are used as DHCP clients. By default, only one interface can obtain an IP address.

OSPF neighbors periodically send Hello messages to establish and maintain adjacency, and the interval of the Hello timer must be consistent, otherwise the adjacency cannot be established. In order to accelerate OSPF convergence, network engineers can set the interval of the Hello message to 1ms.

Which of the following operations does a network engineer not need to perform when processing a single-hop BFD session Dom?

If a network engineer forgets the console port password when troubleshooting, Huawei Net Engine AR series routers support configuration in the Boot ROM to skip the console port password startup.