WideAreaNetwork(WAN)isacomputernetworkthatcoversabroadareA.Whichstatementiscorrectforwide-areanetwork(WAN)?（） A: Limitedinasinglebuilding,agroupofbuildings,orevenasingleroom B: Crossesmetropolitan,regional,ornationalboundaries C: Encompassesanentirecityormetropolitanareaandconnectsmultiplelocal-areanetworks(LANs) D: Connectsclientdeviceswirelessprotocol

覆盖国家的部分地区,多个国家或地区,以及整个世界的大型网络称为( ) A: MANs B: LANs C: PANs D: WANs

Which of the following is a challenge posed by Wi-Fi networks? A: High cost of infrastructure technology B: Susceptibility to interference from nearby wireless systems C: Lack of broadband support D: Connectivity issues with wired LANs

转换器的功能是（）。 A: 增加了网络分段功能 B: 把一种物理介质转换成另一种 C: 分割两个LANS D: 增加了网段中的设备数量