As shown in the figure, RTA, RTB, and RTC run OSPF routing protocol, and the cost value of each link is shown in the figure. OSPF protocol runs between RTA, RTB and RTC, and neighbors are successfully established. BGP runs between RTA and RTB and IBGP neighbors are successfully established; at the same time, 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 on RTA and RTB to import BGP without setting any routing policies.
Based on the above scenario analysis, the correct description below is ______.

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

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In the topology shown in the figure, the network layer is reachable between RTA and RTB, and between RTB and RTC.
The following configurations are performed on RTA, RTB and RTC respectively:
RTA]ospf 1
RTA-ospf-1]area 1
RTA-ospf-1-area-0.0.0.1]network 192.168.1.0 0.0.0.255
RTA-ospf-1-area-0.0.0.1]network 1.1.1.1 0.0.0.0
RTB]ospf 1
RTB-ospf-1]area 1
RTB-ospf-1-area-0.0.0.1]network 192.168.1.0 0.0.0.255
RTB-ospf-1-area-0.0.0.1]area 0
RTB-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
RTB-ospf-1-area-0.0.0.0]network 192.168.2.0 0.0.0.255
RTC]ospf 1
RTC-ospf-1]area 0
RTC-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
RTC-ospf-1-area-0.0.0.0]network 192.168.2.0 0.0.0.255
The following statement is correct ________

• A.Neighbors can be established normally between RTA and RTB
• B.Cannot establish neighbors between RTB and RTC
• C.RTB does not send Hello packets to RTA
• D.RTB can accept Hello messages sent by RTC

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Two routers cannot establish OSPF neighbor relationship. The following possible reasons are ________.

• A.By configuring silent-interface, the adjacent interfaces of both sides do not send protocol packets
• B.The network type of both interfaces is P2P, and the DR election priority has been modified to 0
• C.The Hello time interval of both parties is inconsistent
• D.The authentication passwords configured by both parties are inconsistent

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ND protocol packets are encapsulated by _______.

• A.IPv4
• B.Ethernet
• C.ICMPv6
• D.PPP
• E.IPv6

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Integrated IS-IS supports the ________ protocol.

• A.OSI
• B.ISO
• C.IP
• D.OSI and IP

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