802.11a标准
802.11a标准
相关考题：
关于无线局域网，下面的叙述中正确的是A．802.11标准工作在2.4GHz频段B．802.11b标准和802.11a标准可以互相兼容C．802.11a标准和802.11g标准工作在5GHz频段D．802.11b标准和802.11g标准不互相兼容
802.11a、802.11b和802.11g的区别是什么？（）A、802.11a和802.11b都工作在2.4GHz频段，而802.11g工作在5GHz频段B、802.11a具有最大54GHbps带宽，而802.11g和802.11b只有1Mbps带宽C、802.11a的传输距离最远其次是802.11b，传输距离最近的是802.11gD、802.11a可以兼容802.11b，但802.11a和802.11b不能兼容
以下关于Wi-Fi技术802.11G标准的描述，正确的是（）。A、802.11G与802.11B一样,都工作在2.4GHz频段上B、802.11G与802.11A同样采用OFDM技术C、802.11G与802.11A一样，峰值速率达到54MbpsD、802.11G向下完全兼容802.11B
Which statement describes the call behavior of the Cisco Unified Wireless IP Phone 7921G when it roams from 802.11b to 802.11a?（）A、The phone does a directed call hangup on 802.11b，then does an auto-redial on 802.11a，creating a new call.B、The phone does a directed call hangup on 802.11b， then the user does a redial on 802.11a，creating a new call.C、The phone does a disassociation on 802.11b and an association on 802.11a，and call remains up if the subnet has not changed.D、The phone does not roam from 802.11b to 802.11a when on an active call.E、The phone must switch network profiles to roam from 802.11b to 802.11a.
Which three items does the Cisco WCS Planning Tool Generate Proposal Report provide？（） A、access point position， in feet， from a corner of the floor planB、SNR coverage map for 802.11a/nC、data rate map for 802.11a/nD、percent of coverage by signal
单选题Which statement describes the call behavior of the Cisco Unified Wireless IP Phone 7921G when it roams from 802.11b to 802.11a?（）AThe phone does a directed call hangup on 802.11b，then does an auto-redial on 802.11a，creating a new call.BThe phone does a directed call hangup on 802.11b， then the user does a redial on 802.11a，creating a new call.CThe phone does a disassociation on 802.11b and an association on 802.11a，and call remains up if the subnet has not changed.DThe phone does not roam from 802.11b to 802.11a when on an active call.EThe phone must switch network profiles to roam from 802.11b to 802.11a.