Among the following features that can enhance the security of OSPF are _______

• A.Verification
• B.Filter Tpe3 LSA
• C.Virtual connection
• D.Prohibit the port from sending OSPF packets

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There is a 21.22.23.0/22 in the router's IP routing table. To import it into BGP, which one of the following commands should be used?

• A.network 21.22.23.0 255.255.254.0
• B.network 21.22.20.0 mask 255.255.252.0
• C.network 21.22.23.0 mask 255.255.254.0
• D.network 21.22.20.0 255.255.252.0

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As shown in the figure, the MSR router of the headquarters is connected to the branch through the Ethernet interface E1/0, and the connection is backed up through the ISDN network.

Which of the following options are feasible at this time?

• A.OSPF protocol runs on the Ethernet link between the headquarters and the branch. Then set the static route, the outgoing interface is Bri2/0, and the priority value is 200
• B.OSPF protocol runs on the Ethernet link between the headquarters and the branch. Then set the static route, the outgoing interface is Bri2/0, and the priority value is 0
• C.The RIP protocol runs on the Ethernet link between the headquarters and the branch. Then set the static route, the outgoing interface is Bri2/0, and the default priority value
• D.The RIP protocol runs on the Ethernet link between the headquarters and the branch. Then set up a dynamic routing backup group on the outbound interface Bri2/0

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r Regarding the stub area in the OSPF protocol, the following statement is correct: _______

• A.Tpe7 LSA is not allowed to be injected in the stub area
• B.The virtual link cannot traverse the stub area
• C.The backbone area cannot be configured as a stub area
• D.ASBR cannot exist in the stub area

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