In an 802.11 frame, the terminal needs to obtain access rights to the wireless medium, and what kind of control message is to be sent?

• A.RTS
• B.ACK
• C.CTS
• D.PS-Poll

Comment: *

Name: *

Email: *

Verification: *

When a data frame is sent and acknowledged, what is the time interval to wait before the next data frame is sent ()?

• A.PIFS
• B.DIFS
• C.SIFS
• D.IFS

Comment: *

Name: *

Email: *

Verification: *

The antenna obtains the gain by means of .

• A.Using a power amplifier in the antenna system
• B.Making the antenna radiation more concentrated
• C.Use high efficiency antenna feeder
• D.Use low standing wave ratio equipment

Comment: *

Name: *

Email: *

Verification: *

The indicator used to describe the extent to which the antenna converges on the transmit power is.

• A.Gain
• B.Power
• C.Polarity
• D.Broadband

Comment: *

Name: *

Email: *

Verification: *

Unlike the 802.11a/b/g standard, the 802.11n protocol is a dual-band mode of operation (supporting two operating bands of 2.4 GHz and 5 GHz).

• A.False
• B.True

Comment: *

Name: *

Email: *

Verification: *