RTA and RTB are not directly interconnected, and are located in autonomous systems 100 and 200 respectively. The loopback0 address of RTA is 1.1.1.1, and the loopback address of RTB is 02.2.2.2.

If an EBGP neighbor relationship is established between RTA and RTB with loopback0, which of the following configurations is the correct configuration on RTA?

As shown in the figure, the MSR router of the headquarters is connected to the branch through the Ethernet interface E1/0, and the connection is backed up through the ISDN network. Which of the following options is the most feasible at this time?

After executing the displaospf routing command on the MSR router RTA, the router output is as follows:

From the above output it can be judged that ______.

In the IS-IS network shown in the figure, after the routes of each router are stable, the IS-IS Level-1 routes in the IS-IS LSDB of the RTE have ______.

In the IS-IS network as shown in the figure, if the route is stable, the RTB and RTD are changed to 192.168.224.0/24, then the IS-IS topology is ______, and the IP routing information is ______.