In OSPF protocol, when the interface network type is P2P (point-to-point), its default Hello interval and neighbor failure time are ______ respectively.

As shown in the figure, PCA and PCB should communicate with each other, so _______ technology can be used between RTA and RTB.

As shown in the figure, RTA has established IBGP peer relationship with RTB, RTC and RTD. When RTA advertises routes to these three IBGP peers, it uses a unified filter 3001, which is implemented through peer groups.
To achieve the above purpose, the administrator configures the RTA as follows:
RTA-BGP]group in internal
RTA-BGP]peer in connect-interface Loopback0
RTA-BGP]peer 10.0.0.2 group in
RTA-BGP]peer 10.0.0.3 group in
RTA-BGP]peer 10.0.0.4 group in
RTA-BGP]peer in filter-polic3001
Then in the above configuration statement, the error is ______

The advantage of the OSPF protocol hierarchy is ______.

Which of the following commands can be used to view all the configured and enabled PBR information?