How many subcarriers can 802.11a use to transmit data in 20M mode?

• A.54
• B.56
• C.52
• D.48

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Which of following description is correct about power divider and coupler?

• A.power divider and coupler are equal power allocation
• B.power divider and coupler are unequipower allocation
• C.power divider are unequipower allocation, coupler are are equipower allocation
• D.power divider are equipower allocation, coupler are unequipower allocation

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What is used to define roaming in the IEEE 802.11 standard?

• A.IEEE 802.11c
• B.IEEE 802.11j
• C.IEEE 802.11h
• D.IEEE 802.11r

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When the AC is a side-by-side networking, if the data is directly forwarded, the data stream () AC; if the data is in tunnel forwarding mode, the data Stream AC.

• A.No pass, no pass
• B.After passing through not
• C.After passing through
• D.No pass, pass

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Which of the following options does belong to the EDCA parameters? (Multiple Choice)

• A.SIFS
• B.AIFSN
• C.TXOPLimit
• D.DIFS

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