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Understanding TCP/IP

You're reading from   Understanding TCP/IP A clear and comprehensive guide to TCP/IP protocols

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Product type Paperback
Published in May 2006
Publisher Packt
ISBN-13 9781904811718
Length
Edition 1st Edition
Concepts
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Author (1):
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CP Books a.s. CP Books a.s.
Author Profile Icon CP Books a.s.
CP Books a.s.
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Toc

Table of Contents (20) Chapters Close

Preface 1. Introduction to Network Protocols FREE CHAPTER 2. Network Monitoring Tools 3. Physical Layer 4. Link Layer 5. Internet Protocol 6. IP Address 7. Routing 8. IP Version 6 9. Transmission Control Protocol 10. User Datagram Protocol 11. Domain Name System 12. Telnet 13. File Transfer Protocol 14. Hypertext Transfer Protocol 15. Email 16. Forums 17. Lightweight Directory Access Protocol A. CISCO Routers Index

4.1 Serial Line Internet Protocol

Serial Line Internet Protocol places IP packets directly into the serial line. In order to control the line, escape sequences are placed between data (analogous to communication between a computer and a printer).

SLIP protocol is specified by the standard RFC 1055. SLIP is a very simple protocol, which is used to transfer packets of the network layer.

4.1 Serial Line Internet ProtocolSerial Line Internet Protocol (SLIP)description

Figure 4.1: SLIP protocol frame

Each protocol frame begins and ends with a flag. In the case of SLIP protocol, the flag is known as END (C016). Most implementations of SLIP place an END flag at the beginning as well. If the byte C016 appears in the transferred data, it is substituted with a SLIP escape sequence couplet—DB16DC16 (not the ASCII Esc-sequence 1B16)—and if the byte DB16 appears it is substituted with the couplet DB16DD16.

SLIP protocol is very simple, but there are a few negative aspects to it as shown in the following bullet list:

  • SLIP protocol does not ensure error detection during...
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