【单选题】【消耗次数：1】
（ ）集中处理拨入拨出的用户信通信,可以同时包含模拟和数字接口，能够同时支持数以百计的用户。
①
接入服务器
②
核心路由器
③
WAN交换机
④
调制解调器
参考答案：
复制
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