The IS-IS process of a router has been configured with NET as 01.abcd.0001.0002.0003.00, which of the following NET addresses can still be configured?

The following functions of the convergence layer are ______. (Choose one or more)

In BGP protocol messages, unreachable routing information is advertised through ______.

B As shown in the figure, RTA, RTB, and RTC run OSPF, and the process number is 100; OSPF process 200 runs between RTA, RTB, and RTD. The cost of all interconnected links is set to 10. Set the external route priority of OSPF 100 on RTA and RTB to 190, and import an external route 172.16.1.0/24 into OSPF 100 on RTC. Both RTA and RTB are configured to import OSPF100 routes into OSPF200.
According to the above scenario analysis, the following description about RTD learning external routing 172.16.1.0/24 is correct.

Among the following features that can enhance the security of OSPF are _______