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COS 420

Agenda. Midterm Exam Graded Very disappointing resultsNo one passedRetake Take home Due Wednesday MidnightAny evidence of any collaboration will results in ZEROAssignment 3 will be posted this weekIndividual Project DueWritten Portions Due 2PM March 15E-mail via WebCTPresentations and Gro

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COS 420

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    1. COS 420 Day 11

    2. Agenda Midterm Exam Graded Very disappointing results No one passed Retake Take home Due Wednesday Midnight Any evidence of any collaboration will results in ZERO Assignment 3 will be posted this week Individual Project Due Written Portions Due 2PM March 15 E-mail via WebCT Presentations and Group Grading March 18 Today we will look at RST

    3. PART XIII RELIABLE STREAM TRANSPORT SERVICE (TCP)

    4. Transmission Control Protocol Major transport service in the TCP/IP suite Used for most Internet applications (esp. World Wide Web)

    5. TCP Characteristics Stream orientation Virtual circuit connection Buffered transfer Unstructured stream Full duplex connection Reliability

    6. Providing Reliability Traditional technique: Positive Acknowledgement with Retransmission (PAR) Receiver sends acknowledgement when data arrives Sender starts timer whenever transmitting Sender retransmits if timer expires before acknowledgement arrives

    7. Illustration Of Acknowledgements Time moves from top to bottom in the diagram

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