H12-311-ENU

Which of the following AP mode does not belong to WDS network()?A . Root APB . Middle APC . Bridge APD . Leaf APView AnswerAnswer: C

In 1999, the IEEE 802.11a standard setting is complete,it rules that the Wireless Local Area Network working frequency in 5.15 ~ 5.825GHz,data transfer rate reached 11 MBPS 。A . TrueB . FalseView AnswerAnswer: B

The standard of 802.11n use double band (2.4GHz and 5GHz), the maximum theoretical transmission rate can reach to 300Mbps, actual test rate can reach more than 100Mbps.A . TrueB . FalseView AnswerAnswer: B

Which is the longest interval in the frame of 802.11()?A . SIFSB . IFSC . DIFSD . PIFSView AnswerAnswer: C

Which rate that 802.11 protocol do not support?A . 6MbpsB . 12MbpsC . 24MbpsD . 30MbpsView AnswerAnswer: D

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

In Wireless LAN 802.11, which contents are included in CSMA/CA Mechanism()? (Select 3 Answers)A . Carrier SenseB . Multiple AccessC . Collision DetectionD . Conflict AvoidanceView AnswerAnswer: A B D

Different from 802.11a/b/g standards,802.11n protocol is for dual-band work mode,(can support both 2.4GHz and 5GHz two working frequency band) 。A . TrueB . FalseView AnswerAnswer: A

Which the following content are included in 802.11n MAC layer technology improvement?()? (Select 2 Answers)A . Frame PolymerizationB . MIMO TechnologyC . Piece of technologyD . BeamformingView AnswerAnswer: A C

In 802.11 frame through what parameters to restructure the frame pieces()?A . Frame ControlB . DurationC . Address bitD . Fragment numberView AnswerAnswer: D