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Point-to-Point Protocol

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Votes: 1
Posted: 07 Sep, 2016
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Updated: 08 Sep, 2016
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In computer networkingPoint-to-Point Protocol (PPP) is a data link (layer 2protocol used to establish a direct connection between two nodes. It can provide connection authentication, transmission encryption (using ECPRFC 1968), and compression.

PPP is used over many types of physical networks including serial cablephone linetrunk linecellular telephone, specialized radio links, and fiber optic links such as SONET. PPP is also used over Internet access connections. 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 protocol.

Two derivatives of PPP, 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.

PPP is commonly used as a data link layer protocol for connection over synchronous and asynchronous circuits, where it has largely superseded the older Serial Line Internet Protocol (SLIP) and telephone company mandated standards (such as Link Access Protocol, Balanced (LAPB) in the X.25 protocol suite). The only requirement for PPP is that the circuit provided be duplex. PPP was designed to work with numerous network layer protocols, including Internet Protocol (IP), TRILL, Novell's Internetwork Packet Exchange (IPX), NBF,DECnet and AppleTalk.

cr.https://en.wikipedia.org/wiki/Point-to-Point_Protocol

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