The following figure shows a campus network. IS-IS is configured on all routers, and the network runs normally.

By default, which of the following routers have specific routes on the entire network?

• A.R2
• B.R3
• C.R1
• D.R7

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Which of the following statements regarding OSPF route summarization is false?

• A.OSPF supports two route summarization modes: ABR summarization and ASBR summarization.
• B.Any router in OSPF can summarize routes.
• C.Route summarization is the process of summarizing routes with the same prefix into one route and then advertising only the summarized route to other areas.
• D.Route summarization can reduce routing information, decrease the routing table size, and improve router performance.

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An enterprise network runs OSPF to implement network communication. Which of the following types of LSAs may be generated by an ABR?

• A.NSSA LSA
• B.AS External LSA
• C.Network Summary LSA
• D.ASBR Summary LSA

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Which of the following descriptions about the IGMPv3 report (G, INCLUDE, (S1)) sent by a host is correct?

• A.Only receive data sent by source S1 to multicast group G
• B.Accept data sent by source S1 to multicast group G
• C.Do not accept the data sent by source S1 to multicast group G
• D.Do not accept data sent by multicast group G containing source S1 item

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On an OSPF network, if a router receives an update of an LSA that exists in the local LSDB, the router updates the LSDB and floods the LSA.

• A.TRUE
• B.FALSE

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