What is wrong with this configuration description is:

[Huawei]dhcp enable
[Huaweijinte GigabitEthernet 0/0/1 [Huawei-GigabitEthernet0/0/1 ]dhcp option82 insert en [Huawei-GigabitEthernet0/0/1 ]dhcp snooping enable [Huawei-GigabitEthernet0/0/1]dhcp snooping trusted

• A.turn onDHCP Snoopingconfiguration can be used to preventARPspoofing attack
• B.configureGigabitEthernetO/0/lThe interface is a trusted interface
• C.turn onDHCP Snoopingconfiguration can be used to preventDHCP ServerCounterfeiter Attack
• D.ifGigabitEthemnetOIO/1received by the interfaceDHCPIn the request message, there is noOption82of SutOptioninformation, the device will generateOption82,and insert it into the message

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When deploying MPLS/BGP IP VPN, regarding the use of BGP to exchange routing information between PE-CE, which of the following description is wrong?

• A.When PE and CE use BGP to exchange routing information, if the autonomous systems of two VPN sites use the same private AS number, the AS number replacement function can be used, that is, the received AS number can be replaced with any designated AS number. The AS number in the private network route to prevent the route from being discarded due to repeated AS numbers
• B.In the Hub&Spoke scenario, when Hub-CE and Hub-PE use IGP, Spoke-PE and Spoke-CE cannot enable EBGP
• C.In the case of CE multi-homing, enabling the BGP AS number replacement function may cause routing loops, which can be used to prevent routing loops in VPN sites through BGP SoD
• D.When BGP is used to exchange routing information between PE and CE, there is no need to import BGP private network routes on PE

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Please match the command with the function implemented.

• A.display device-® Display version-® Display memory-usage-® Display cpu-usage-?
• B.display device-® Display version-® Display memory-usage-® Display cpu-usage-?
• C.display device-® Display version-® Display memory-usage-® Display cpu-usage-?
• D.display device-® Display version-® Display memory-usage-® Display cpu-usage-?

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The link state value information between different ISIS processes of multiple routers is considered to be isolated.

• A.TRUE
• B.FALSE

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IS-IS is a link-state routing protocol that uses the SPF algorithm for route calculation. As shown in the figure, a campus deploys both IPv4 and IPv6 and runs IS-IS to achieve network interconnection. R2 only supports IPv4. Which of the following statements is true about the topology calculation of this network?

• A.By default, IPv4 and IPv6 networks will be calculated separately to form different shortest path trees
• B.By default, since R2 does not support IPv6, in the shortest path tree formed by IPv6 network calculation, the path from R1 to R4 is: R1-R3-R4
• C.If you want IPv4 and IPv6 network computation to form the same shortest path tree, you need to run the ipv6 enable topology ipv6 command to enable the IPv6 capability in the IS-IS process.
• D.By default, in the shortest path tree formed by IPv6 network calculation, the path from R1 to R4 is: R1-R2-R4. Since R2 does not support IPv6, R2 will directly discard IPv6 packets after receiving them, causing traffic loss.

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