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6.033 Lecture 10 Layering and Reliability

slides: http ://mit.edu/6.033/www/assignments/lec10.pdf. Key Ideas: 3 Layer Network At least once delivery At most once delivery Sliding window protocol. 6.033 Lecture 10 Layering and Reliability. Quiz 1 Scores. March 8, 2010. End-to-end Interface. Src

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6.033 Lecture 10 Layering and Reliability

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  1. slides: http://mit.edu/6.033/www/assignments/lec10.pdf • Key Ideas: • 3 Layer Network • At least once delivery • At most once delivery • Sliding window protocol 6.033 Lecture 10Layering and Reliability Quiz 1 Scores March 8, 2010

  2. End-to-end Interface Src conn=open_stream(dest,port) send(conn,bytes1) send(conn,bytes2) close_stream(conn) Dest conn= listen(port) bytes=recv(conn)

  3. RTT Is Variable

  4. Exponentially Weighted Moving Average (EWMA) measure = new RTT measurement rtt = α(measure) + (1-α)(rtt) ; α = 1/8 timeout = β * rtt ; β = 2

  5. 6 a2 p2 Sliding Window in Action window = 1-5 window = 2-6 4 3 2 1 5 Sndr a1 Rcvr p1

  6. 6 7 a3 a2 p2 p3 Sliding Window in Action window = 2-6 window = 3-7 4 3 2 1 5 Sndr a1 Rcvr p1 Send next packet as acks arrive, rather than waiting for all acks in window

  7. 7 6 a4 a3 a5 a2 p5 p4 p2 p3 Still may wait idle idle idle window = 2-3 window = 1-2 window = 3-4 4 3 2 1 5 Sndr a1 Rcvr p1

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