R1, R2, R3, R4 run OSPF, the area ID is as shown in the figure, then () will generate Type-3 LSA. (Please fill in the device name, such as R1)

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When IGMP query is configured with SSM Mapping rules, SSM services can only be provided to member hosts running IGMPv2

• A.TRUE
• B.FALSE

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In OSPF broadcast or NBMA network types, devices with a large DR Priority may not necessarily become DR.

• A.TRUE
• B.FALSE

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As shown in the figure, four routers in the same LAN are running lS-IS, where R1 is DIS, then R2, R3, R4 establish adjacency relationship with R1 respectively, and no adjacency relationship is established between R2, R3, and R4.

• A.False
• B.True

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Which description is correct about the prefix list? (Multiple choice)

• A.The prefix list can be used for packet filtering
• B.The prefix list is used to filter IP prefixes and cannot match the prefix number and prefix length at the same time
• C.The prefix list cannot be used for packet filtering
• D.The prefix list is used to filter IP prefixes, which can match the prefix number and prefix length at the same time

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