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Summary

Summary. Network and service Application features and requirements Network functions Connection-oriented vs. connection-less Confirmed vs. unconfirmed. Telegraphy and message switching Telephone and circuit switching Computer network and packet switching. summary.

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Summary

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  1. Summary • Network and service • Application features and requirements • Network functions • Connection-oriented vs. connection-less • Confirmed vs. unconfirmed • Telegraphy and message switching • Telephone and circuit switching • Computer network and packet switching

  2. summary • Protocols, services and layers • OSI seven layer architecture • Each layer functions • Provide service by interface (access point) • End-to-end, point-to-point • TCP/IP architecture • IP, TCP, UDP, HTTP, DNS, SMTP • Data: glue of protocol.

  3. Summary • ARQ: reliable data service • SW, GBN,SR • Mechanisms: timers, retransmission, sequence number, ack, nak, enq, sliding window • Window size • Efficiency: error free or error with p. • Parameters: propagation, rate, transmission time, frame length, processing time, round trip time, delay-bandwidth product, distance, speed of light. • End-to-end, hop-by-hop

  4. summary • Flow control: ON-OFF, sliding window • TCP preview • Framing • PPP • HDLC • CRC

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