H12-311-ENU

In 20m Mode, how many subcarriers of 802.11a can be used to transfer data()?A . 48B . 52C . 54D . 56View AnswerAnswer: A

Which protocol can support both 2.4 GHz frequency band and 5 GHz frequency band()?A . 802.11aB . 802.11bC . 802.11gD . 802.11nView AnswerAnswer: D

Radio frequency mainly use spread spectrum technology, which of the following technology is belong to spread spectrum technology? (Select 2 Answers)A . FHSSB . DSSSC . QPSKD . OFDMView AnswerAnswer: A B

In the frame of 802.11, when Network employs WDS Model to improve the signal, what are the values of To DS and From Ds()?A . 0,0B . 0,1C . 1,0D . 1,1View AnswerAnswer: A

What kind of technology belongs to Wireless MAN in the folllowing()?A . 2G/3GB . WLANC . BluetoothD . WiMAXView AnswerAnswer: B

How many channels do China support in 2.4 GHz frequency band()?A . 11B . 13C . 3D . 5View AnswerAnswer: B

WDS technique improves the flexibility and convenience of the whole network structure, but can only support the working mode of point to point 。A . TrueB . FalseView AnswerAnswer: B

How much bandwidth each 802.11 g frequency band channel()?A . 25 MHzB . 20 MHzC . 50 MHzD . 22 MHzView AnswerAnswer: B

Because the maximum support rate of 802.11a is the same as 802.11g, so the protocol of 802.11a is backwards compatible with 802.11g protocol.A . TrueB . FalseView AnswerAnswer: B

In the following options which frequency band range belong to China supported 5 GHZ frequency band()?A . 5.15~5.25GHzB . 5.25~5.35GHzC . 5.725~5.825GHzD . 5.725~5.850GHzView AnswerAnswer: D