In the network as shown in the figure, the correct IP addresses have been configured on RTA, RTB and RTC.
Execute the following commands on the three routers RTA, RTB and RTC:
RTA-Serial5/0] ospf dr-priorit100
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
RTB] ospf 1 router-id 2.2.2.2RTB-ospf-1] area 0
RTB-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255
RTC] ospf 1 router-id 3.3.3.3 RTC-ospf-1] area 0
RTC-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255
Judging from the above configuration, ________

• A.RTA and RTB, RTA and RTC can establish neighbors
• B.A neighbor cannot be established between RTA and RTB, but a neighbor can be established between RTA and RTC
• C.A neighbor can be established between RTA and RTB, but a neighbor cannot be established between RTA and RTC
• D.RTA and RTB, RTA and RTC cannot establish neighbors

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

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

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

It can be judged from the above output that ________.

• A.RTA is elected as DR on the interconnected network
• B.The Router ID of RTA's OSPF process 1 is 2.2.2.2
• C.RTA is connected to the opposite end through the GE0/0 interface, and the IP address of GE0/0 is configured as 192.168.1.2
• D.The Router ID of the neighbor router in OSPF process 1 of RTA is 3.3.3.3

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Regarding the default metric values ​​for route import by different routing protocols, which of the following descriptions is __________

• A.BGP uses the cost value of the imported route plus 1 as the MED value after importing the BGP domain
• B.BGP uses the cost value of the imported route as the MED value after importing the BGP domain
• C.When OSPF routing protocol imports routes, the default cost of the imported routes is 1
• D.When OSPF routing protocol imports routes, the default cost of the imported routes is 0

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In the IS-IS network as shown in the figure, RTA, RTC, RTD, and RTE establish a Level-2 neighbor relationship with each other; RTB, RTA, and RTC establish a Level-1 neighbor relationship. After the reasons for each router are stable, when RTB accesses 192.168.14.1, the next hop is ______.
If RTC adds the following configuration at this time:
RTC-isis-1]import-route isis level-2 into level-1
Then when RTB accesses 192.168.4.1, the next hop is ______.

• A.RTA; RTC
• B.RTC; RTC
• C.RTC; RTA
• D.RTA; RTA

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