An existing switch runs the RSTP protocol. If the network topology changes, what will happen to the Layer 2 forwarding entries automatically learned by the switch?

• A.Except for the entries related to the edge ports that are not deleted, all other entries are deleted
• B.All entries are deleted
• C.Except for the entries related to the edge port and the entry related to the port receiving the TC message are not deleted, all other entries are deleted
• D.If the aging time is set to 15 seconds. Then the items that have exceeded the aging time will be deleted
• E.Only entries related to the port that received the TC message will be deleted

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There can be multiple nodes under a route-policy. Different node numbers are identified by node. Each node can have multiple if-match and apply clauses. Which of the following descriptions are wrong? (Multiple Choice)

• A.The relationship between different nodes is "or"
• B.The relationship between different nodes is "and"
• C.The relationship between if-match clauses under each node is "and"
• D.The relationship between if-match clauses under each node is "or"

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The following statements about the VRRP protocol which are correct?

• A.Both VRRPv2 and VRRPv3 support authentication.
• B.VRRPv2 is only applicable to IPv4 networks, and VRRPv3 is only applicable to IPv6 networks.
• C.VRRPv3 does not support authentication, while VRRPv2 supports authentication.
• D.The owner of the Mater IP address has VRRP priority of 255, so the priority range that can be configured is 0-254.

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Which of the following description is wrong about BGP routing selection?

• A.Non-aggregated routes take precedence over aggregated routes.
• B.See the following entry in the BGP routing table: * 172.16.1.11/32 0.0.0.0 10 0. Indicates that the route is available non-optimal.
• C.If the PrefVal and Local_Preference are equal, if the locally generated route, the IBGP route, and the BGP preference of the EBGP route are used, the valid indication generated by this priority takes precedence.
• D.The route that is unreachable for next_hop is invalid and does not participate in the preference.

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Which of the following descriptions of the OSPF protocol are correct? (Multiple choice)

• A.AS-External-LSA describes the path from the router to the ASBR
• B.The cost value of the second type of external route is only the AS external cost value, and the AS internal cost value is ignored
• C.AS-External-LSA describes the route to the external route of the AS, and the flooding scope is outside the AS
• D.AS-External-LSA does not belong to any area

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