填空题 4.  ______ VPNs require VPN client software to be installed on the remote computer or dedicated VPN devices (hardware clients) to enable full routed IP access to internal resources. ______VPN需要在远程计算机或专用VPN设备(硬件客户端)上安装VPN客户端软件，从而启用去往内部资源的完全路由的IP访问。