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MCSE : Security Specialist Gateways enable communication between different network architectures. A gateway takes the data from one network and repackages it, so that each network can understand the other network’s data. A gateway is like an interpreter. For example, if two groups of people can physically talk to each other but speak different languages, they need an interpreter to communicate. Similarly, two networks can have a physical connection but need a gateway to translate network communication.   Use a gateway to link two systems that do not use the same:   Architecture. Set of communication rules and regulations. Data-formatting structures.   Remote Access Connectivity Types Windows 2003 enables users to connect to a network from a remote location through a variety of hardware, such as modems. A modem enables a computer to communicate over telephone lines. The remote access client connects to the remote access server, which acts as a router, or a gateway, for the client to the remote network. A telephone line commonly provides the physical connectivity between the client and server. The remote access server runs the Routing and Remote Access feature in Windows 2003 to support remote connections and to provide interoperability with other remote access solutions. The two types of remote access connectivity provided in Windows 2003 are dial-up remote access and virtual private network (VPN).     Dial-up Remote Access   Windows 2003 Server provides dial-up remote access to users who dial corporate intranets. Dial-up equipment installed on a remote access server running Windows 2003 answers incoming connection requests from dial-up networking clients. The dial-up equipment answers the call, verifies the caller’s identity, and transfers data between the dial-up networking client and the corporate intranet.     Virtual Private Network   A virtual private network (VPN) uses encryption technology to provide security and other features formerly available only in private networks. VPNs provide this security through a process called tunneling. Tunneling is a method of using an internetwork infrastructure to securely transfer data from one network to another network. A VPN enables telecommuters and employees at remote locations to establish a secure connection to a corporate server that is connected to both the corporate LAN and a public internetwork, such as the Internet. From the user’s perspective, the VPN provides a point-to-point connection between the user’s computer and a corporate server. The intermediate internetwork is transparent to the user because it appears as if the remote access client is connected directly to the corporate LAN/remote access server