单选题What is A WAN？（）AA network that connects client devices wirelessly using radio wavesBA network that crosses metropolitan, regional, or national boundariesCA network that is restricted.to a single building ,a group of buildings, or even a single roomDA network that encompasses an entire city or metropolitanared. and. connects multiple LANs
单选题
What is A WAN？（）
A
A network that connects client devices wirelessly using radio waves
B
A network that crosses metropolitan, regional, or national boundaries
C
A network that is restricted.to a single building ,a group of buildings, or even a single room
D
A network that encompasses an entire city or metropolitanared. and. connects multiple LANs
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A local-area network(LAN)is a communications network that(125)a variety of devices and provides a(126)for information exchange among those devices. The scope of the LAN is small typically a single building or a cluster(丛)of buildings. The LAN is usually owned by the same organization that owns the(127)devices. The internal data rate of LAN is at least several Mb/s.The basic of LAN communication is broadcasting. At each station, there is a transmitter/receiver that communicates over a(128)shared, By other stations. A transmission from any one station is(129)to and received by all other stations.A．broadcastB．cableC．controlD．interconnectsE．internet
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