Which of the description about OSPF route summarization is wrong?

• A.Through route aggregation, routing information can be reduced, thereby reducing the size of the routing table, and improving the performance of the router
• B.OSPF has two route aggregation methods: ABR aggregation and ASBR aggregation
• C.Inter-area route aggregation refers to the aggregation of routing information with the same prefix, and only one route is published to other areas
• D.Any router in OSPF can perform route aggregation operations

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As shown in the figure, all three switches run the RSTP protocol, so which one of the following descriptions about the topology convergence process is correct?

• A.The device interconnection port of the downstream link quickly enters the Forwarding state through the P/A mechanism
• B.When the network is initialized, the ports of all the switches in the figure are designated ports and are in the Discarding state
• C.The edge port of SW3 will immediately enter the Forwarding state after a round of P/A mechanism
• D.The upstream link port of SW2 will immediately enter the Forwarding state after receiving the RSTBPDU with the Proposal bit set from 5W1.

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IGMPv1 defines a mechanism for electing a querier when there are multiple routers in a shared network.

• A.False
• B.True

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Which of the following BGP attributes does not have to exist in the Update message?

• A.Origin
• B.Next_Hop
• C.WITH
• D.AS_Path

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Which of the following LSAs has a propagation range only in a single area? (Multiple choice)

• A.Network LSA
• B.Summary LSA
• C.AS External LSA
• D.Router LSA

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