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Point-to-Point Protocol

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Computer Science
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Last edited
17 Sept 2026
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  1. Point-to-Point Protocol
Point-to-Point Protocol
Data link layer communication protocol
OSI layerData link layer
RFCs1661 (Core Specification)
1662 (HDLC-like Framing)
1332 (IP Control Protocol)
HardwareModem, ISDN Terminal Adapters, Serial Interfaces

Preview warning: Page using Template:Infobox networking protocol with unknown parameter "acronym"

In computer networking, Point-to-Point Protocol (PPP) is a data link layer (layer 2) communication protocol between two routers directly without any host or any other networking in between.1 It can provide loop detection, authentication, transmission , and .

encryption
2
data compression

PPP is used over many types of physical networks, including serial cable (PPPoS), phone line, trunk line, cellular telephone, specialized radio links, ISDN, and fiber optic links such as SONET. Since IP packets cannot be transmitted over a modem line on their own without some data link protocol that can identify where the transmitted frame starts and where it ends, Internet service providers (ISPs) have used PPP for customer dial-up access to the Internet.

PPP is used on former dial-up networking lines.3 Two derivatives of PPP, Point-to-Point Protocol over Ethernet (PPPoE) and Point-to-Point Protocol over ATM (PPPoA), are used most commonly by ISPs to establish a digital subscriber line (DSL) Internet service LP connection with customers.

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General
  • Recent changes
  • Related articles
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This article
Reading time
8 min
Topic
Computer Science
Quality
C-class
Views
7k in 14 days
Last edited
17 Sept 2026
Print/export
  • Printable version
In other projects
  • Wikidata item
Last edited
17 Sept 2026