ECE453 – Introduction to Computer Networks

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Presentation transcript:

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)

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

The Data Link Layer in the Internet

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)

PPP LCP option negotiation Physical Layer NCP configures connection network layer

Summary Framing Error correction Error detection 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.