In the IS-IS network as shown in the figure, the verification part of each router is configured as follows
RTA-Serial2/0]isis authentication-mode md5 h3c
RTB-isis-1]area-authentication-mode md5 h3c
RTC-isis-1]domain-authentication-mode md5 h3c
Then RTA and RTB______ synchronize LSDB, and RTB and RTC______ synchronize LSDB.

In the IS-IS network as shown in the figure, RTA and RTB are configured as follows:
RTA]isis
RTA-isis-1]network-entit01.1111.1111.1111.00
RTA-isis-1]interface serial 2/0
RTA-Serial2/0]isis enable 1
RTB]isis 2
RTB-isis-2]network-entit01.2222.2222.2222.00
RTB-isis-2]interface serial 1/0
RTB-Serial1/0]isis enable 2
RTB-Serial1/0]isis circuit-level level-2
Then between RTA and RTB ______

There is a 192.168.1.0/27 in the router's IP routing table. To import it into BGP, which of the following commands should be used?

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

The following belong to the OSPF special area ______