Barker code is an 11-bit sequence (for example, 10110111000), which has advantages in wireless transmission and can effectively reduce interference, but reduces efficiency.

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802.11b is a protocol based on Orthogonal Frequency Division Multiplexing (OFDM for short) technology.

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The 802.11n standard uses dual frequency bands (2.4GHz and 5GHz), the theoretical transmission rate can reach up to 300Mbps, and the actual test rate can reach more than 100Mbps.

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The modulation methods adopted by DSSS are BPSK and QPSK respectively.

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Spread-spectrum (spread-spectrum) technology is the basis for transmitting wireless data using the ISM frequency band.

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In a point-to-multipoint networking environment, one device acts as the central device, and all other devices only establish wireless bridges with the central device to realize the interconnection of multiple networks. The disadvantage is that the intercommunication of multiple branch networks must pass through the central bridge device for data forwarding.

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Because the maximum rate supported by 802.11a is the same as that supported by 802.11g, the 802.11a protocol is backward compatible with the 802.11g protocol.

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Which of the following rates is not supported by the 802.11a protocol?

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A company wants to deploy WLAN. The company purchased a batch of wireless APs that support 802.11n. After the WLAN is deployed, only wireless clients that support 802.11n can connect to the company’s WLAN.

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In the 802.11 frame, the value used to record the network allocation vector (NAV) is?

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