What are the rates that 802.11a can support?
A. 6,12,24,54 Mbps
B. 6,9,12,18,24,36,48,54 Mbps
C. 6,12,18,24,36,48,54 Mbps
D. 6,9,12,18,24,30,36,48,54 Mbps
What are the rates that 802.11g can support?
A. 1,2,5.5,11and6,9,12,18,24,30,36,48,54 Mbps
B. 6,9,12,18,24,36,48,54 Mbps
C. 1,2,5.5,11and6,9,12,18,24,36,48,54 Mbps
D. 6,9,12,18,24,30,36,48,54 Mbps
Which of the following is included in the 802.11n MAC layer improvement technology (Select 2 Answers)?
A. Frame aggregation technology
B. MIMO technology
C. Block confirmation technology
D. Beamforming technology
In the WDS peer-to-peer network, the backbone link between the Root AP and the Leaf AP is connected in the 5 GHz band. The bandwidth used by the Root AP is 149. Which of the following bands should the Leaf AP use?
A. 149
B. 153
C. 157
D. Except for 149
MIMO (Multiple input and multiple output), that is, multiple input and multiple output, wireless access points and clients using 802.11n technology can simultaneously transmit data using up to three spatial streams, and the theoretical rate can reach 600 Mbps.
A. True
B. False
When a data frame is sent and acknowledged, what is the time interval to wait before the next data frame is sent ()?
A. SIFS
B. IFS
C. DIFS
D. PIFS
Which type of message is used in the 802.11 frame for the terminal to receive data packets in the power saving mode? B
A. RTS
B. CTS
C. ACK
D. PS-Poll
In the 802.11 frame, the interframe space between RTS and CTS is ()?
A. SIFS
B. IFS
C. DIFS
D. PIFS
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. CTS
C. ACK
D. PS-Poll
What is correct in the following options (Select 3 Answers)?
A. SSID technology can divide a wireless local area network into several sub-networks that require different authentication. Each sub-network needs independent authentication. Only authenticated users can enter the corresponding sub-network to prevent unauthorized access. The user enters the network.
B. The BSSID is actually the MAC address of the AP, which is used to identify the BSS managed by the AP, and maps the BSSID and SSID in the same AP.
C. Users can implement roaming under different SSIDs.
D. The SSID is the same in an ESS, but the BSSID corresponding to each AP in the ESS is different. If an AP can support multiple SSIDs at the same time, the AP will assign different BSSIDs to correspond to these SSIDs.
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