Point-to-Point Protocol           (PPP)           Accessing the WAN – Chapter 2ITE I Chapter 6   © 2006 Cisco Systems, Inc...
Objectives                 Describe the fundamental concepts of point-to-point serial                  communication incl...
Fundamental Concepts of Point-to-Point           Serial Communication           Concept of serial communication as the ba...
Serial Communication Standards     Serial connections commonly used – why?                  •cost of cable and synchroniz...
RS-232ITE 1 Chapter 6   © 2006 Cisco Systems, Inc. All rights reserved.   Cisco Public            5
Fundamental Concepts of Point-to-Point           Serial Communication            Htwo or more data streams are transporte...
Fundamental Concepts of Point-to-Point           Serial Communication            Define the location of the demarcation p...
Fundamental Concepts of Point-to-Point           Serial Communication            Explain the terms DTE and DCE with relat...
Fundamental Concepts of Point-to-Point           Serial Communication            Describe how high-level data link contro...
Fundamental Concepts of Point-to-Point           Serial Communication            Explain when and how to configure HDLC  ...
Describe the Fundamental Concepts of           Point-to-Point Serial Communication            Describe the procedure to f...
Point-to-Point Concepts            Describe PPP in terms of its use in WAN links                                         ...
Point-to-Point Concepts            Describe the general function of each layer of PPP             architectureITE 1 Chapt...
Point-to-Point Concepts            Describe the purpose and format of each of the fields in             a PPP frameITE 1 ...
Point-to-Point Concepts            Define the three phases of PPP session establishment                                  ...
Point-to-Point Concepts            Explain the role of the LCP in PPPITE 1 Chapter 6   © 2006 Cisco Systems, Inc. All rig...
Point-to-Point Concepts            Describe the characteristics of NCPITE 1 Chapter 6   © 2006 Cisco Systems, Inc. All ri...
Configure PPP on a Serial Interface            Describe how configuration options are communicated             in the LCP...
Configure PPP on a Serial Interface            Explain the purpose of the commands used to             configure and veri...
Configure PPP on a Serial Interface            Explain the output of the show interfaces serial             commandITE 1 ...
Configure PPP on a Serial Interface            Explain the output of the debug ppp commandITE 1 Chapter 6   © 2006 Cisco ...
Configuring PPP with Authentication            Differentiate between PAP and CHAPITE 1 Chapter 6   © 2006 Cisco Systems, ...
Configuring PPP with Authentication            Describe how to use PAP to authenticate a PPP             connectionITE 1 ...
Configuring PPP with Authentication            Describe how to use CHAP to authenticate a PPP             connectionITE 1...
Configuring PPP with Authentication            Outline the PPP encapsulation and authentication             process on a ...
Configuring PPP with Authentication            Explain how to configure a PPP connection with             authenticationI...
Configuring PPP with Authentication            Explain the output of the debug ppp authentication             commandITE ...
Summary          PPP is a widely used WAN protocol          PPP provides multi-protocol LAN to WAN connections         ...
Summary          PPP authentication                  –PAP                           •2 way handshake                  –CH...
ITE 1 Chapter 6   © 2006 Cisco Systems, Inc. All rights reserved.   Cisco Public   30
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Chapter 2 point-to-point protocol (ppp)

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  • Graphic 2.1.1.1
  • Graphics 2.1.2.1, 2.1.2.2 & 2.1.2.3
  • Graphic 2.1.3.1
  • Graphics 2.1.4.1 & 2.1.4.2 (for the latter graphic modify it to use the serial and the router to router pictures)
  • Graphic 2.1.5.1
  • Graphic 2.1.6.1
  • Graphic 2.1.7.1 (use status)
  • Graphic 2.2.1.1 PPP contains three main components: HDLC protocol for encapsulating datagrams over point-to-point links. Extensible Link Control Protocol (LCP) to establish, configure, and test the data link connection. Family of Network Control Protocols (NCPs) for establishing and configuring different network layer protocols. PPP allows the simultaneous use of multiple network layer protocols. Some of the more common NCPs are Internet Protocol Control Protocol, Appletalk Control Protocol, Novell IPX Control Protocol, Cisco Systems Control Protocol, SNA Control Protocol, and Compression Control Protocol.
  • Graphics 2.2.2.1 thru 2.2. PPP Architecture - Link Control Protocol Layer The LCP is the real working part of PPP. The LCP sits on top of the physical layer and has a role in establishing, configuring, and testing the data-link connection. The LCP establishes the point-to-point link. The LCP also negotiates and sets up control options on the WAN data link, which are handled by the NCPs. 2.3 PPP permits multiple network layer protocols to operate on the same communications link. For every network layer protocol used, PPP uses a separate NCP. For example, IP uses the IP Control Protocol (IPCP), and IPX uses the Novell IPX Control Protocol (IPXCP).
  • Graphic 2.2.3.1
  • Graphic 2.2.4.1
  • Graphic 2.2.5.1 (link negotiation)
  • Graphic 2.2.6.1
  • Graphic 2.3.1.1
  • Graphic 2.3.2.1 Graphic 2.3.3.1
  • Graphic 2.3.3.1 (commands)
  • Graphic 2.3.4.1
  • Graphic 2.4.1.1
  • Graphic 2.4.2.1
  • Graphic 2.4.3.1
  • Graphic 2.4.4.1
  • Graphic 2.4.5.1
  • Graphic 2.4.6.1
  • Transcript of "Chapter 2 point-to-point protocol (ppp)"

    1. 1. Point-to-Point Protocol (PPP) Accessing the WAN – Chapter 2ITE I Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1
    2. 2. Objectives  Describe the fundamental concepts of point-to-point serial communication including TDM, demarcation point, DTE-DCE functions, HDLC encapsulation, and serial interface troubleshooting.  Describe PPP concepts including PPP layered architecture, PPP frame structure, PPP session establishment, multiprotocol encapsulation support, link control protocol (LCP), network control protocol (NCP), and Internet Protocol Control Protocol (IPCP).  Configure PPP on a serial interface including enabling PPP encapsulation, verifying the PPP connection and troubleshooting encapsulation problems.  Configure PPP authentication including explaining PAP and CHAP authentication protocols, configuring PPP authentication using PAP and CHAP, and troubleshooting PPP authentication problems.ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 2
    3. 3. Fundamental Concepts of Point-to-Point Serial Communication  Concept of serial communication as the basis of WAN technologies – Which is faster? Two wires to carry 2 bits Eight data- carrying wires to carry 8 bits – 1 byteITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 3
    4. 4. Serial Communication Standards  Serial connections commonly used – why? •cost of cable and synchronization •simpler wiring •longer than parallel cables •much less interaction (crosstalk)  There are three key serial communication standards •RS-232 - pc to modem •V.35 - modem-to-multiplexer - DSU •HSSI - High-Speed Serial Interface – Token RingITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 4
    5. 5. RS-232ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 5
    6. 6. Fundamental Concepts of Point-to-Point Serial Communication  Htwo or more data streams are transported across a single physical connection using TDMITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 6
    7. 7. Fundamental Concepts of Point-to-Point Serial Communication  Define the location of the demarcation point relative to customer and service provider networksITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 7
    8. 8. Fundamental Concepts of Point-to-Point Serial Communication  Explain the terms DTE and DCE with relative to the location of devices in a networkITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 8
    9. 9. Fundamental Concepts of Point-to-Point Serial Communication  Describe how high-level data link control (HDLC) uses one of three frame types to encapsulate dataITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 9
    10. 10. Fundamental Concepts of Point-to-Point Serial Communication  Explain when and how to configure HDLC encapsulation on a routerITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 10
    11. 11. Describe the Fundamental Concepts of Point-to-Point Serial Communication  Describe the procedure to follow when troubleshooting a serial connectionITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 11
    12. 12. Point-to-Point Concepts  Describe PPP in terms of its use in WAN links •The link quality management feature monitors the quality of the link. If too many errors are detected, PPP takes the link down. •PPP supports PAP and CHAP authentication. This feature is explained and practiced in a later section.ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 12
    13. 13. Point-to-Point Concepts  Describe the general function of each layer of PPP architectureITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 13
    14. 14. Point-to-Point Concepts  Describe the purpose and format of each of the fields in a PPP frameITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 14
    15. 15. Point-to-Point Concepts  Define the three phases of PPP session establishment LCP must first open the connection and negotiate configuration options. The LCP tests the link to determine whether the link quality is sufficient to bring up network layer protocols. NCP can separately configure the network layer protocols, and bring them up and take them down at any time.ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 15
    16. 16. Point-to-Point Concepts  Explain the role of the LCP in PPPITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 16
    17. 17. Point-to-Point Concepts  Describe the characteristics of NCPITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 17
    18. 18. Configure PPP on a Serial Interface  Describe how configuration options are communicated in the LCP frameITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 18
    19. 19. Configure PPP on a Serial Interface  Explain the purpose of the commands used to configure and verify PPP connectionsITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 19
    20. 20. Configure PPP on a Serial Interface  Explain the output of the show interfaces serial commandITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 20
    21. 21. Configure PPP on a Serial Interface  Explain the output of the debug ppp commandITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 21
    22. 22. Configuring PPP with Authentication  Differentiate between PAP and CHAPITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 22
    23. 23. Configuring PPP with Authentication  Describe how to use PAP to authenticate a PPP connectionITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 23
    24. 24. Configuring PPP with Authentication  Describe how to use CHAP to authenticate a PPP connectionITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 24
    25. 25. Configuring PPP with Authentication  Outline the PPP encapsulation and authentication process on a flow chartITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 25
    26. 26. Configuring PPP with Authentication  Explain how to configure a PPP connection with authenticationITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 26
    27. 27. Configuring PPP with Authentication  Explain the output of the debug ppp authentication commandITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 27
    28. 28. Summary  PPP is a widely used WAN protocol  PPP provides multi-protocol LAN to WAN connections  PPP session establishment – 4 phases Link establishment Link quality determination Network layer protocol configuration negotiation Link termination  WAN Encapsulation –HDLC default encapsulation –PPPITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 28
    29. 29. Summary  PPP authentication –PAP •2 way handshake –CHAP •3 way handshake –Use debug ppp authentication to confirm authentication configuration  PPP configuration –Done on a serial interface  After PPP configuration, use show interfaces command to display: –LCP state –NCP stateITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 29
    30. 30. ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 30
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