The IEEE 802.11ac standard only supports the 5GHz frequency band.

• A.FALSE
• B.TRUE

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On the VRP platform, the default protocol priority of routes in the direct routing, static routing, RIP, OSPF area is:

• A.Direct routing,RIP,Static routing,OSPF
• B.Direct routing,Static routing,RIP,OSPF
• C.Direct routing,OSPF,Static routing,RIP
• D.Direct routing,OSPF,RIP,Static routing

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

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

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Which of the following statements about the role of STP protocol Forward Delay is correct?

• A.Prevent temporary loops
• B.Reduce the time interval of BPDu sending. Improve the convergence speed of STP
• C.There is a delay when the B1ocking state and the Disabled state are converted
• D.Improve the survival time of BPDUs to ensure that the configured BPDUs can be forwarded to more switches

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Which of the following statement about the transport layer protocol is correct? (Multiple choice)

• A.UDP uses the STNOACK flag to request and confirm the establishment of a connection
• B.UDP is suitable for the transmission of delay-sensitive traffic, and can be reorganized according to the sequence number field in the message header
• C.TCP establish a connection is a three-way handshake process, TCP terminates the connection will have to go through four-way handshake
• D.The range of well-known port numbers is 0-1023

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