An authentication request for a PPP over ATM client has been returned to the router with an address of 255.255.255.254. What does this indicate to the router?（）
无线客户端被动扫描是通过接收什么帧获取到周围的无线网络信息（）。A、Beacon 帧B、Probe Request 帧C、Authentication 帧D、Association Request 帧
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Servlet A forwarded a request to servlet B using the forward method of RequestDispatcher. What attributein B’s request object contains the URI of the original request received by servlet A？（）A、REQUEST_URIB、javax.servlet.forward.request_uriC、javax.servlet.forward.REQUEST_URID、javax.servlet.request_dispatcher.request_uriE、javax.servlet.request_dispatcher.REQUEST_URI
A接口消息中属于正常有连接消息的是（）A、加密命令消息(CIPHER MODE COMMAND)B、鉴权请求消息(AUTHENTICATION REQUEST)C、鉴权响应消息(AUTHENTICATION RESPONSE)D、加密结束消息(CIPHER MODE COMPLETE)
PPP Echo-Request、Echo-Reply除了握手之外，还具备检测环路的功能，那么它会携带什么配置参数选项？（）A、Maximum-Receive-UnitB、Magic-NumberC、Authentication-ProtocolD、Reserved
CALL CONFIRMED是从MS发送到MSC的信号，其作用是（）。A、响应MSC的SETUP信号B、响应MSC的AUTHENTICATION REQUEST信号C、响应MSC的PAGING COMMAND
InitialNASmessage包括（）A、Attach RequestB、Tracking Area Update RequestC、Authentication RequsetD、Service RequestE、Detach Request
无线客户端主动扫描是通过发送什么帧获取到周围的无线网络信息的（）。A、Beacon 帧B、Probe Request 帧C、Authentication Request 帧D、Association Request 帧
