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Chapter 12 Point-to-Point Access: PPP

Chapter 12 Point-to-Point Access: PPP. Point-to-Point protocol PPP stack. Point-to-Point Protocol: PPP. Many Internet users use telephone lines to connect home computers to Internet providers A point-to-point link protocol is required to control and manage the transfer of data PPP defines

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Chapter 12 Point-to-Point Access: PPP

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  1. Chapter 12Point-to-Point Access: PPP Point-to-Point protocol PPP stack Data Communications, Kwangwoon University

  2. Point-to-Point Protocol: PPP • Many Internet users use telephone lines to connect home computers to Internet providers • A point-to-point link protocol is required to control and manage the transfer of data • PPP defines • The format of the frame to be exchanged between devices • How two devices negotiate the establishment of the link and the exchange of data • How network layer data are encapsulated in the data link frame • How two devices can authenticate each other Data Communications, Kwangwoon University

  3. PPP Frame Data Communications, Kwangwoon University

  4. Transition States Data Communications, Kwangwoon University

  5. Protocol Stack Data Communications, Kwangwoon University

  6. LCP Packet Encapsulated in a Frame • For establishing, maintaining, configuring, and terminating links • code: Type of LCP packet • ID: A value used to match a request with the reply Data Communications, Kwangwoon University

  7. LCP packets Data Communications, Kwangwoon University

  8. LCP: Common Options • Options are inserted in the information field of the configuration packets Data Communications, Kwangwoon University

  9. Authentication • Authentication means validating the identity of a user who needs to access • PPP is designed for use over dial-up links  User authentication is necessary • PPP has two protocols for authentication • Password Authentication Protocol (PAP) • Challenge Handshake Authentication Protocol (CHAP) Data Communications, Kwangwoon University

  10. PAP Data Communications, Kwangwoon University

  11. PAP Packets Data Communications, Kwangwoon University

  12. CHAP Data Communications, Kwangwoon University

  13. CHAP Packets Data Communications, Kwangwoon University

  14. Network Control Protocol: NCP • In the networking state, PPP uses NCP • To encapsulates data from network layer protocols (such as IP, IPX, and Appletalk) • IPCP (IP Control Protocol) • Establishes and terminates a network layer connection for IP packets • After configuration, an IP packet is carried in the payload field of a PPP frame (protocol=002116) • Other protocols have their own sets of control packets Data Communications, Kwangwoon University

  15. IPCP Packet Encapsulated in PPP Frame Data Communications, Kwangwoon University

  16. Code Value for IPCP Packets Data Communications, Kwangwoon University

  17. An Example Data Communications, Kwangwoon University

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