In the topology shown in the figure, the following configurations are performed on RTA and RTB respectively:
RTA]ospf 1
RTA-ospf-1]area 1
RTA-ospf-1-area-0.0.0.1]network 10.0.0.0 0.0.0.255
RTB]ospf 1
RTB-ospf-1]area 1
RTB-ospf-1-area-0.0.0.1]network 10.0.0.0 0.0.0.255
RTB-ospf-1-area-0.0.0.1]area 0
RTB-ospf-1-area-0.0.0.0]network 20.0.0.0 0.0.0.255
If you need to configure area 2 as an NSSA area and require all interface addresses of RTA to be pingable on RTD, how should you configure it on RTC and RTD?

H In OSPF protocol, when the interface network type is NBMA (Non-Broadcast Multiple Access), its default Hello interval and neighbor failure time are ______ respectively.

Among the following routing protocols, the one that belongs to EGP is ______, and the one that uses link state algorithm is ______.

OSPF TotallNSSA area will definitely not inject ______ type LSA.

When the interface neighbor relationship verification is configured in IS-IS, the IS-IS message type to be verified is _________.