1. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Chapter 12 Point-to-Point Access: PPP

2. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 12.1 Point-To-Point Protocol Frame Format Transition States

3. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 12.1 PPP frame

4. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 12.2 Transition states

5. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 12.2 PPP Stack Link Control Protocol (LCP) Authentication Protocols Network Control Protocol (NCP) Bit Padding Digital Signals (DS) Services

6. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 12.3 Protocol stack

7. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 12.4 LCP packet encapsulated in a frame

8. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Table 12.1 LCP packets and their codes CodePacket TypeDescription 01 16 Configure-request Contains the list of proposed options and their values 02 16 Configure-ack Accepts all options proposed 03 16 Configure-nak Announces that some options are not acceptable 04 16 Configure-reject Announces that some options are not recognized 05 16 Terminate-request Requests to shut down the line 06 16 Terminate-ack Accepts the shut down request 07 16 Code-reject Announces an unknown code 08 16 Protocol-reject Announces an unknown protocol 09 16 Echo-request A type of hello message to check if the other end is alive 0A 16 Echo-reply The response to the echo-request message 0B 16 Discard-request A request to discard the packet

9. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Table 12.2 Common options OptionDefault Maximum receive unit1500 Authentication protocolNone Protocol field compressionOff Address and control field compressionOff

10. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 12.5 PAP

11. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 12.6 PAP packets

12. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 12.7 CHAP

13. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 12.8 CHAP packets

14. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 12.9 IPCP packet encapsulated in PPP frame

15. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Table 12.3 Code value for IPCP packets CodeIPCP Packet 01Configure-request 02Configure-ack 03Configure-nak 04Configure-reject 05Terminate-request 06Terminate-ack 07Code-reject

16. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 12.10 An example