In the topology shown in the figure, execute the following command on the RTA router:
RTA-ospf-1] default-route-advertise alwa
RTA] ip route-static 0.0.0.0 0.0.0.0 192.168.0.2
The default route cannot be observed in the routing table of the RTC router, the possible reason is ______

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 ______

In the topology shown in the figure, the following configurations are performed on RTA, RTB, RTC and RTD respectively:
RTA] ospf 1 router-id 1.1.1.1
RTA-ospf-1] area 0
RTA-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255
RTA-ospf-1-area-0.0.0.0] network 1.1.1.1 0.0.0.0
RTB] ospf 1 router-id 2.2.2.2
RTB-ospf-1] area 0
RTB-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255
RTB-ospf-1-area-0.0.0.0] network 2.2.2.2 0.0.0.0
RTB-ospf-1] area 1
RTB-ospf-1-area-0.0.0.1] network 192.168.2.0 0.0.0.255
RTC] ospf 1 router-id 3.3.3.3
RTC-ospf-1] area 1
RTC-ospf-1-area-0.0.0.1] network 192.168.2.0 0.0.0.255
RTC-ospf-1-area-0.0.0.1] network 3.3.3.3 0.0.0.0
RTC-ospf-1] area 2
RTC-ospf-1-area-0.0.0.2] network 192.168.3.0 0.0.0.255
RTD] ospf 1 router-id 4.4.4.4
RTD-ospf-1] area 2
RTD-ospf-1-area-0.0.0.2] network 192.168.3.0 0.0.0.255
RTD-ospf-1-area-0.0.0.2] network 4.4.4.4 0.0.0.0
Then the routes that can be learned on RTA are _____

In the IS-IS network as shown in the figure, the configuration of the authentication part of each router is 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 on RTB, the state of RTA neighbor relationship is ______; while RTC______ RTB Level-1 LSP packets

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

From the above output, it can be judged that ________.