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ECE453 – Introduction to Computer Networks

ECE453 – Introduction to Computer Networks. Lecture 6 – Data Link Layer Protocol (III). Example Data Link Protocols. HDLC – High-Level Data Link Control SDLC (IBM) ADCCP (ANSI) HDLC (ISO) LAP  LAPB as part of the X.25 (CCITT) The Data Link Layer in the Internet PPP Ethernet (LAN).

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ECE453 – Introduction to Computer Networks

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  1. ECE453 – Introduction to Computer Networks Lecture 6 – Data Link Layer Protocol (III)

  2. Example Data Link Protocols • HDLC – High-Level Data Link Control • SDLC (IBM) • ADCCP (ANSI) • HDLC (ISO) • LAP  LAPB as part of the X.25 (CCITT) • The Data Link Layer in the Internet • PPP • Ethernet (LAN)

  3. High-Level Data Link Control • Bit-oriented protocol • Frame format • Sliding window • 3-bit seq number

  4. The Data Link Layer in the Internet

  5. PPP – Point to Point Protocol What’s the indication? • Character-oriented • Frame format • unnumbered frame • Error detection • Multiprotocol framing • LCP (link control protocol) • NCP (network control protocol)

  6. PPP LCP option negotiation Physical Layer connection NCP configures network layer

  7. Framing Counter Byte-stuffing Bit-stuffing Error correction Hamming code Error detection CRC Example link layer protocols HDLC PPP Reliable data transform Utopia Stop-and-wait protocol Simplex stop-and-wait Simplex stop-and-wait in noisy channel Sliding window protocols Go-Back-N (GBN) Sender buffer Cumulative ack. Selective Repeat (SR) Sender and receiver buffer Selective ack. Summary

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