NAPT allows multiple private IP addresses to be mapped to the same public IP address through different port numbers, so which of the following descriptions about port numbers in NAPT is correct?

• A.No need to do any port number configuration
• B.Only need to configure the port number range
• C.The correspondence between the port number and the private address must be manually configured
• D.You need to use ACL to assign port numbers

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In Huawei equipment, which of the following methods can OSPF elect Router ID? (Multiple choice)

• A.If no loopback interface is configured, select the largest IP address among the IP addresses of other interfaces as the Router ID
• B.Use the default 127.0.0.1
• C.Huawei switches may use the IP address of the largest VLANIF as the Router ID
• D.If a loopback interface is configured, select the largest IP address from the IP addresses of the loopback interface as the router ID
• E.Manually define an arbitrary legal Router ID

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For the network shown in the figure below, which of the following statements is correct?

• A.Because the sub-interface numbers of Router A and Router B are inconsistent, Router A and Router B cannot communicate
• B.The sub-interface of Router B cannot learn the MAC address of the sub-interface of Router
• C.The sub-interface of Router A cannot learn the MAC address of the sub-interface of Router
• D.10.0.12.1 can ping 10.0.12.2

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The multicast address FF02::1 indicates all nodes in the link-local range.

• A.False
• B.True

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Among the following options, which one does not belong to the SDN network architecture?

• A.Controller layer
• B.Application collaboration layer
• C.Device layer
• D.Chip layer

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