Point-to-Point Protocol (PPP) What is the Point-to-Point Protocol (PPP)? The Point-to-Point Protocol (PPP) is a data link layer protocol used to establish direct connections between two network nodes, supporting communication over various physical mediums. Explanation PPP is widely used for internet connections, including dial-up, DSL, and VPNs. It supports features like authentication, compression, and error detection. Practical Example of PPP A VPN uses PPP to establish a secure, direct connection between a remote user and the corporate network, ensuring data integrity.