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MCITP MCSE : Security Specialist   Remote Access Protocols   In Windows 2003, you can establish a remote connection by using either dialup remote access or a virtual private network (VPN). To establish a remote access connection to a Windows 2003 network, you can select from the following remote access protocols:   Dial-up protocols VPN protocols   These remote access protocols are supported by Windows 2003 and provide interoperability with third party remote access components. Understanding the features of each protocol will help you decide which protocol is appropriate for your network.     Dial-up Protocols Windows 2003 supports dial-up remote access protocols, such as Serial Line Internet Protocol (SLIP) and Point-to-Point Protocol (PPP), to provide clients with access to a variety of remote access servers.   SLIP SLIP allows remote access clients to connect to a remote access server through a modem. This allows client computers running Windows 2003 to connect to SLIP servers. A SLIP server is a remote access protocol component on the remote access server that services connection requests from SLIP clients. Although client computers running Windows 2003 can connect to SLIP servers, Routing and Remote Access does not itself include a SLIP server component. Therefore, you cannot use a computer running Windows 2003 as a SLIP server. Instead, you can use a server running UNIX as a SLIP server. SLIP is an industry standard protocol that addresses TCP/IP connections made over serial lines. SLIP is supported by Routing and Remote Access and gives clients running Windows 2003 access to Internet services. SLIP has several limitations:   Support is limited to TCP/IP. You cannot use SLIP to directly transfer other network protocols, such as IPX/SPX or NetBEUI. A static IP address is required. SLIP requires the client to configure all of the TCP/IP configuration parameters, such as the IP address, prior to establishing a connection to the server. It typically relies on text-based logon authentication sessions and usually requires a scripting system to automate the logon process. It transmits authentication passwords as clear text. This might result in a security compromise because passwords are not encrypted during user authentication.     PPP PPP is a set of industry-standard protocols that enable remote access clients and servers to operate in a network consisting of components manufactured by multiple vendors. PPP supports encrypted password authentication. PPP is an enhancement to the original SLIP specification and provides a standard method for sending network data over a point-to-point link.   PPP support enables computers running Windows 2003 to connect to remote networks through any server that complies with PPP standards. PPP compliance also enables a server to receive calls from, and provide access to, other vendors’ remote access software. The PPP architecture enables clients to use any combination of NetBEUI, TCP/IP, and IPX/SPX network transport protocols. You can run applications  written to the IPX/SPX, NetBIOS, or Windows Sockets (WinSock) interface on a remote computer running Windows 2003. The PPP architecture enables a server to download and configure TCP/IP parameters