As shown in the figure, RTA and RTB use GRE tunnel technology to ensure IPv6 mutual access, please select the correct command to fill in the blanks in the following configuration.
RTA]ipv6
RTA]interface E0/0
RTA-Ethernet0/0]ip address 119.145.22.193
RTA-Ethernet0/0]interface e0/1
RTA-Ethernet0/1]ipv6 address 1::A 64
RTA-Ethernet0/1]undo ipv6 nd ra halt
RTA-Ethernet0/1]interface tunnel 0
RTA-Tunnel0]source e0/0
RTA-Tunnel0]____________________________
RTA-Tunnel0]ipv6 address auto link-local
RTA-Tunnel0]ipv6 route-static 2:: 64 tunnel 0
RTB]ipv6
RTB]interface E0/0
RTB-Ethernet0/0]ip address 121.9.14.210
RTB-Ethernet0/0]interface e0/1
RTB-Ethernet0/1]ipv6 address 2::B 64
RTB-Ethernet0/1]undo ipv6 nd ra halt
RTB-Ethernet0/1]interface tunnel 0
RTB-Tunnel0]source e0/0
RTB-Tunnel0]destination 119.145.22.193
RTB-Tunnel0]ipv6 address 2009::2 112
RTB-Tunnel0]________________________

• A.destination 121.9.14.210 , undo ipv6 nd ra halt
• B.ipv6 address 2009::1 112 , ipv6 route-static 1::64 tunnel 0
• C.destination 121.9.14.210 , ipv6 route-static 1::64 tunnel 0
• D.destination 2009::2 , ipv6 route-static 1::64 tunnel 0
• E.destination 119.145.22.193 , undo ipv6 nd ra halt

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

• A.No default route in RTA's routing table
• B.A routing policy is configured on the RTC to filter the default route
• C.Area1 is configured as an NSSA area
• D.A routing policy is configured on RTB to filter the default route

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In the network shown in the figure, the BGP route learning among the routers is normal, and the BGP route attributes all take the default values.
After importing route 8.0.0.0 into BGP on RTA, if the next hop of route 8.0.0.0 on RTD is to point to RTB, the following adjustment methods are feasible again ______.

• A.Set the Local Preference value of the route sent by RTD to RTC to 200
• B.Set the Local Preference value of the route sent by RTD to RTB to 200
• C.Set the Local Preference value of the route sent by RTD to RTB to 50
• D.Set the Local Preference value of the route sent by RTD to RTC to 50

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If the BGP neighbor is successfully established, the neighbor status viewed by the displabgp peer command is ______.

• A.Full
• B.Established
• C.Connect
• D.Active

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As shown in the figure, RTA, RTB, and RTC run OSPF, and the process number is 100; RTA, RTB, and RTD run OSPF process 200. The cost of all interconnected links is set to 10. Set the external route priority of OSPF 100 to 190 on RTA and RTB, and import an external route 172.16.1.0/24 to OSPF100 on RTC. The RTA is set to import the routes of OSPF100 to OSPF200, and the settings on RTB are to import the routes of OSPF200 to OSPF100 again. After the operation is stable, assume that the external route 172.16.1.0/24 imported on the RTC suddenly disappears.
According to the above scenario analysis, the following description is incorrect is ______.

• A.Route for 172.16.1.0/24 on RTD disappeared
• B.Route for 172.16.1.0/24 on RTC disappeared
• C.The route of 172.16.1.0/24 on RTC still exists, and the next hop points to RTB
• D.The route of 172.16.1.0/24 on RTD still exists, and the next hop points to RTA

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