When the IPv4 protocol is used as the network layer protocol, which field is not included in the network layer header?

• A.Source IPv4 address
• B.Sequence number
• C.Destination IPv4 address
• D.TTL

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Which of the following IPv6 is a global unicast address?

• A.2001::12:1
• B.FEE:FCFF:FEEF:FEC
• C.FF02::1
• D.FF::02::2E0:FCFF:FEEF:FEC

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The device port running STP protocol is in Forwarding state. Which of the following statements is correct?

• A.The port not only forwards user traffic but also processes BPDU packets.
• B.The port not only does not process BPDU packets, but also does not forward user traffic.
• C.The port only receives and processes BPDUs, and does not forward user traffic.
• D.The port will build a MAC address table based on the received user traffic, but does not forward user traffic.

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Which of the following are related to the purpose of encapsulation and decapsulation? (Multiple choice)

• A.Interworking between different networks
• B.Encapsulation and decapsulation are important steps to realize different protocol functions
• C.Encapsulation and decapsulation can complete network fault location
• D.Shorten the length of the message

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The wireless access controller (AC, Access Cntroller) is the unified management and control device in the FIT AP architecture. Which of the following description of the role of AC is wrong?

• A.No matter when the data is forwarded, the user's data message will be forwarded by AC
• B.User access control
• C.User access authentication
• D.AP configuration delivery

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