Remote Access ServersThe preceding section described dial-up networking, a type of remote access method definedby its direct, PSTN-based connection method. However, users who previously depended ondial-up connections are increasingly adopting broadband connections, such as DSL andcable. This section and following sections describe services that can accept remote accessconnections from a client, no matter what type of Internet access it uses.As you have learned, remote access allows a client that is not directly attached to a LAN orWAN to connect and log on to that network. A remote client attempting to connect to a LANor WAN requires a server to accept its connection and grant it privileges to the network’sresources. Many types of remote access servers exist. Some are devices dedicated to this task,such as Cisco’s AS5800 access servers. These devices run software that, in conjunction withtheir operating system, performs authentication for clients and communicates via dial-up networkingprotocols. Other types of remote access servers are computers running special softwarethat enables them to accept incoming client connections and grant clients access to resources.RRAS (Routing and Remote Access Service) is Microsoft’s remote access software, availablewith the Windows Server 2003, Server 2008, and Server 2008 R2 network operating systemsand the Windows XP, Vista, and 7 desktop operating systems. RRAS enables a computer toaccept multiple remote client connections over any type of transmission path. It also enablesthe server to act as a router, determining where to direct incoming packets across thenetwork. Further, RRAS incorporates multiple security provisions to ensure that data cannotbe intercepted and interpreted by anyone other than the intended recipient and to ensure thatonly authorized clients can connect to the remote access server.
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