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 are feasible?

• A.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
• B.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
• 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-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

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On MSR routers, the default OSPF link cost values ​​for Gigabit Ethernet, Fast Ethernet, and Ten Gigabit Ethernet are ______ respectively.

• A.1 , 1 , 1
• B.1 , 10 , 100
• C.1 , 10 , 10
• D.1 , 1 , 10 ,

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Regarding the implementation of BGP load sharing, the following statement is correct ____________

• A.BGP only implements load sharing for routes with the same MED value.
• B.BGP cannot achieve load sharing.
• C.After BGP selects certain routes, it conditionally performs load sharing.
• D.The router supports BGP load based on iteration

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As shown in the figure, RTA, RTB, and RTC run the OSPF routing protocol, and the cost of each link is shown in the figure. Run OSPF protocol between RTA, RTB and RTC, and successfully establish neighbors. Run BGP between RTA and RTB and successfully establish IBGP neighbors; meanwhile, RTA, RTB and RTD establish EBGP neighbors. RTC imports the external route 172.16.1.0/24 into OSPF, the import type is tpe1, and the cost is 200. Configure OSPF routes to import BGP on RTA and RTB, and do not set any routing policy.
According to the above scenario analysis, the correct description below is ______.

• A.Two BGP routes of 172.16.1.0/24 are learned on RTD, with MED values ​​of 210 and 200
• B.Two BGP routes of 172.16.1.0/24 are learned on the RTD, and the MED values ​​are both 200
• C.Two BGP routes of 172.16.1.0/24 are learned on RTD, and the route with the smaller router-id is preferred
• D.Two BGP routes of 172.16.1.0/24 are learned on RTD, with MED values ​​of 210 and 220 respectively
• E.Two BGP routes of 172.16.1.0/24 are learned on RTD, and the route with MED of 200 is preferred
• F.Two BGP routes of 172.16.1.0/24 are learned on RTD, and the route with MED of 210 is preferred

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The correct description of the relationship between Domain and Area in IS-IS is ______.

• A.Area contains Domain
• B.Domain contains Area
• C.There can be multiple Areas in a Domain
• D.There can only be one Domain in an Area

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