Router R1 and Router R2 run BGP. Both routers are in the AS 65234. The route of router R2 exists in the BGP routing table of router R1, but is not in the IP routing table of router R1. So, what caused the problem?

• A.Synchronization is turned off
• B.The BGP neighbor relationship is Down.
• C.Router R1 does not enable BGP Multi-hop
• D.Routing is not optimal

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ICMPv6 has two types: Error Messages and Information Messages.

• A.TRUE
• B.FALSE

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If there is a Huawei switch running the STP protocol, and now the G0/0/17 interface and G0/0/18 interface of the switch are connected by a cable, which of the following descriptions about this scenario is correct?

• A.Both the G0/0/17 interface and G0/0/18 interface will enter the Forwarding state
• B.Both the G0/0/17 interface and G0/0/18 interface will enter the Discarding state
• C.The G0/0/18 interface will continue to change back and forth between the listening state and the learning state
• D.The G0/0/18 interface will enter the Discard ing state
• E.The G0/0/17 interface will enter the Blocking state

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By default, the switch configures the MAC address table to be empty. Host A connected to the switch sends the first unicast data frame. What operation will the switch perform after receiving the data frame?

• A.The switch records the source MAC address of the data frame and floods the data frame.
• B.The switch forwards the data frame out of an interface according to the destination MAC address of the data frame.
• C.The switch will discard the data frame
• D.The switch caches the data frame and waits for the destination host to send the data frame and then forward it.

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Which of the following descriptions about the differences between IGMP versions are correct? (Multiple choice)

• A.IGMPv1/v2/v3 cannot support the SSM model
• B.IGMPv1/v2 cannot elect a querier by itself, while IGMPv3 can
• C.IGMPv1 does not support specific group queries, while IGMPv2 supports
• D.For members to leave, IGMPv2/v3 can leave actively, but IGMPv1 cannot

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