What problem does IGMP Snooping mainly solve?

• A.There are a large number of receiver hosts on the network segment, and the router will receive a large number of IGMP Report messages.
• B.The receiver host only supports the IGMPv2 protocol, but the SSM multicast model is used in the network
• C.IGMP Report message legality issue
• D.Solve the problem of multicast data message broadcasting on Layer 2 devices, which is used to manage and control the forwarding of multicast data messages

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Use the IP prefix list as shown in the figure for route matching. Which of the following routes can be matched?
ip ip-prefix List1 index 10 permit 192.168.1.0 24 greater-equal 24 less-equal 27

• A.192.168.2.0/24
• B.192.168.3.0/25
• C.192.168.1.0/23
• D.192.168.1.0/27

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Which of the following attacks is not a network layer attack?

• A.A RP spoofing attack
• B.ICMP attack
• C.IP spoofing attack
• D.Smurf attack

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Which protocol modules can BFD detection be linked with? (Multiple choice)

• A.Static routing
• B.VRRP
• C.OSPF
• D.BGP

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Which layer of data packets does the packet filtering firewall inspect?

• A.Application layer
• B.Network layer
• C.Physical layer
• D.Link layer

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