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, how should you configure it on RTC and RTD?

• A.RTC]ospf 1 RTC-ospf-1]area 0 RTC-ospf-1-area-0.0.0.0]network 20.0.0.0 0.0.0.255 RTC-ospf-1-area-0.0.0.0]area 2 RTC-ospf-1-area-0.0.0.2]nssa RTC-ospf-1-area-0.0.0.2]network 30.0.0.0 0.0.0.255 RTD]ospf 1 RTD-ospf-1]area 2 RTD-ospf-1-area-0.0.0.2]network 30.0.0.0 0.0.0.255 RTD-ospf-1-area-0.0.0.0]stub
• B.RTC]ospf 1 RTC-ospf-1]area 0 RTC-ospf-1-area-0.0.0.0]network 20.0.0.0 0.0.0.255 RTC-ospf-1-area-0.0.0.0]area 2 RTC-ospf-1-area-0.0.0.2]nssa RTC-ospf-1-area-0.0.0.2]network 30.0.0.0 0.0.0.255 RTD]ospf 1 RTD-ospf-1]area 2 RTD-ospf-1-area-0.0.0.2]network 30.0.0.0 0.0.0.255 RTD-ospf-1-area-0.0.0.2]nssa
• C.RTC]ospf 1 RTC-ospf-1]area 0 RTC-ospf-1-area-0.0.0.0]network 20.0.0.0 0.0.0.255 RTC-ospf-1-area-0.0.0.0]area 2 RTC-ospf-1-area-0.0.0.2]nssa RTC-ospf-1-area-0.0.0.2]network 30.0.0.0 0.0.0.255 RTD]ospf 1 RTD-ospf-1]area 2 RTD-ospf-1-area-0.0.0.2]network 30.0.0.0 0.0.0.255
• D.RTC]ospf 1 RTC-ospf-1]area 0 RTC-ospf-1-area-0.0.0.0]network 20.0.0.0 0.0.0.255 RTC-ospf-1-area-0.0.0.0]area 2 RTC-ospf-1-area-0.0.0.2]nssa RTC-ospf-1-area-0.0.0.2]network 30.0.0.0 0.0.0.255 RTD]ospf 1 RTD-ospf-1]area 2 RTD-ospf-1-area-0.0.0.2]network 20.0.0.0 0.0.0.255 RTD-ospf-1-area-0.0.0.2]nssa

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Regarding the address prefix list matching process, which of the following statements are correct?

• A.During the matching process, the router checks each table item identified by the index number in ascending order. As long as a certain table item meets the condition, it means that it passes the filtering of the address prefix list
• B.During the matching process, the router checks each table item identified by the index number in ascending order. Only if all the table items meet the conditions, it means passing the filtering of the address prefix list
• C.In the prefix list, if all entries are in denial mode, no route can pass the filtering list
• D.In the prefix list, each entry has a corresponding matching mode, including allow and deny two modes

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In the topology shown in the figure, the correct IP addresses have been configured on RTA, RTB and RTC, and the network layer is reachable.
If OSPF neighbors need to be established between routers and routes are transmitted correctly, which of the following configurations is definitely feasible?

• A.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 2.2.2.2 RTB-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
• B.RTA-Serial5/0] ospf dr-priorit50 RTA] ospf 1 router-id 1.1.1.1 RTA-ospf-1] peer 192.168.1.2 RTA-ospf-1] peer 192.168.1.3 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 2.2.2.2 RTB-ospf-1] peer 192.168.1.1 RTB-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] peer 192.168.1.1 RTC-ospf-1] area 0 RTC-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255
• C.RTA-Serial5/0] fr map ip 192.168.1.3 20 broadcast RTA-Serial5/0] fr map ip 192.168.1.2 50 broadcast RTA-Serial5/0] ospf network-tpe p2mp 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-Serial5/0] fr map ip 192.168.1.1 30 broadcast RTB-Serial5/0] ospf network-tpe p2mp 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 RTC-Serial5/0] fr map ip 192.168.1.1 40 broadcast RTC-Serial5/0] ospf network-tpe p2mp 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
• D.RTA] ospf 1 router-id 1.1.1.1 RTA-ospf-1] peer 192.168.1.2 RTA-ospf-1] peer 192.168.1.3 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 2.2.2.2 RTB-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

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As shown in the figure, RTA is the border router of OSPF routing and BGP routing domain. If a BGP route with a MED value of 100 is imported into OSPF on RTA, then by default, RTB learns the COST value of the route ______.

• A.100
• B.0
• C.1
• D.101

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Among the following OSPF protocol states, those that are not stable are ________.

• A.Loading
• B.Init
• C.Attempt
• D.2-waC

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