WAN connection types include leased line, circuit-switched, and packet-switched.
WAN连接类型包括专线、电路交换和分封交换。
Such a cache server would have to sit closest to the outgoing WAN connection to provide the maximum benefit.
这种高速缓存服务器必须位于离外出广域网连接最近的位置，以提供最大的利益。
Thus, network traffic between client 210 and server 250 must pass through network device 220, WAN connection 230, and network device 240.
因此，客户端210与服务器250之间的网络话务必须通过网络设备220、WAN连接230、以及网络设备240。
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