# Remote Access Protocols and Services Remote Access Protocols and Services RAS (Remote Access Service) - Service that enables you to connect to a computer from a remote location Ex - From home to work. It allows the services which would be available on a remote network to be accessed over a dial-up connection. RAS was originally developed by Microsoft and built into their windows NT line of server software. Works with major network protocols such as TCP/IP, NetBeri and IPX/SPX SLIP (Serial Line Internet Protocol) - This is a protocol for communication between two computers using a serial connection such as typical phone line. Designed so data can transmit over serial ports and modem connections (phone lines). It is rarely used anymore because it is not a secured protocol. Does not support encryption or authentication. All information is sent in clear text. Does not provide error checking and is limited to using only the TCP/IP protocol. So a better protocol was needed to address these issues and that protocol was PPP. PPP (Point-To-Point Protocol) - The standard remote access protocol used today. Supports encryption or authentication. This is a protocol used for communication between two computers using a serial connection such as a typical phone line. This is a secure protocol. Most ISPs use this protocol for their customers who want to access the internet through a dial up connection. PPPoE (Point-To-Point Protocol over Ethernet) - Protocol uses PPP over ethernet. Used for encapsulating PPP frames in Ethernet frames. Developed for DSL cable modem or wireless connections to the internet. Used for connecting multiple users on a LAN to a remote site sharing a common device. PPPTP (Point-To-Point Tunneling Protocol) - Used for creating VPNs (Virtual Private Network). This is the default protocol associated with VPN. Ensures data transfer is secure by creating a secure tunnel. GRE (Generic Route Encapsulation) - Protocol that is used with PPTP in creation of a VPN network. Creates the tunnel in PPTP. Encapsulates the data in a secure manner. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://anishkashukla.gitbook.io/networking/remote-access-protocols-and-services/remote-access-protocols-and-services.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.