802.11a的合法频宽是（）.
802.11a的合法频宽是（）.
相关考题：
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
与802.11a/b/g只用20MHZ宽带不同的是，802.11n定义了两种频带宽度20M和40M，在2.4GHZ频段内40M频宽模式下可提供的互不干扰的信道数量是（）。A、0B、2C、3D、4
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.
填空题与802.11a/b/g只用20MHZ宽带不同的是，802.11n定义了两种频带宽度20M和40M，在2.4GHZ频段内40M频宽模式下可提供的互不干扰的信道数量是（）.