Point-to-Point Protocol


Point-to-Point Protocol (PPP) is a Data-link Layer OSI-Model communications protocol used to establish a direct connection between two nodes.

Point-to-Point Protocol connects two routers directly without any other networking device in between.

Point-to-Point Protocol can provide connection authentication, transmission encryption, and compression.

Point-to-Point Protocol is used over many types of physical networks including serial cable, phone line, trunk line, Mobile Network telephone, specialized radio links, and fiber optic links such as SONET.

Internet Service Providers (ISPs) have used PPP for customer dial-up access to the Internet, since IP packets cannot be transmitted over a modem line on their own, without some Data-link Layer.

Two derivatives of Point-to-Point Protocol, Point-to-Point Protocol over Ethernet (PPPoE) and Point-to-Point Protocol over ATM (PPPoA), are used most commonly by Internet Service Providers (ISPs) to establish a Digital Subscriber Line (DSL) Internet service connection with customers.

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