In the WLAN, ACK frame belongs to what type of frame?

• A.management frames
• B.Data Frame
• C.Control Frame
• D.empty data frame

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The following description of WEP encryption is wrong.

• A.WEP encryption allows the device to store four keys at the same time.
• B.WEP encryption uses a stream encryption algorithm.
• C.WEP encryption adds IV to destroy the regularity of the key. The length of the IV in C.WEP encryption is 48 bits.

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Radio frequency mainly use spread spectrum technology, which of the following technology is belong to spread spectrum technology? (Multiple choice)

• A.OFDM
• B.QPSK
• C.FHSS
• D.DSSS

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The following is a description of the classification and function of Huawei AP. The following statement is correct (Select 3 Answers).

• A.AP6310SN is an indoor distributed AP
• B.AP6010SN and AP6010DN are indoor-mounted APs
• C.AP6510DN and AP6610DN are outdoor APs
• D.AP6610DN is a Gigabit fiber interface, so it cannot be directly connected to the AC6605.

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Which of the following options belong to the differences between 802.11b/g protocol? (Multiple choice)

• A.different capacity
• B.two protocols use different technology
• C.support different data rates
• D.work of different frequency bands

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