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homework _2

homework _2 - for each of the following cases a Stop and...

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Boston University Fall 2009 ECE Department Introduction to Computer Networking (EC 441) Homework #2 Solve the following exercises from the textbook (Kurose & Ross): Chapter 3: P. 4 (in part a. and b., you should compute the 1’s complement checksum of the two bytes) P. 11 (note that rdt3.0 is identical to stop & wait presented in class), P. 12, P. 16, P. 18 Additional Question (from Exam) It’s Friday 5 PM, and you need to send your e-homework as soon as possible to the GTF of your favorite course. Your computer is directly connected to the GTF’s computer by a link of capacity 1 Mb/s. The propagation delay of the link (in each direction) is 2 ms. Your e-homework consists of 8 packets, each of size 1000 bits (including the header). You wisely decide to send these packets using a reliable sliding-window protocol. For simplicity, assume that the transmission delay of an ACK message is negligible. 1. What should be the length of the sequence number field (in bits) in each packet,

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Unformatted text preview: for each of the following cases: a. Stop and Wait. b. Go-Back N with a sender window size equal to 4. c. Selective Repeat with a sender window size equal to 4. 2. Assume no packet is lost. Draw a space-time diagram and compute how much time it will take until the GTF receives all the 8 packets, for each of the following cases: a. Stop and Wait. b. Go-Back N with a sender window size equal to 4. c. Selective Repeat with a sender window size equal to 4. This question continues on the next page. 3. Assume that the fifth packet is lost. Assume a time-out value of 10 ms. Draw a space-time diagram and compute how much time it will take until the GTF will receive the 8 packets, for each of the following cases: a. Stop and Wait b. Go-Back N with a sender window size equal to 4. c. Selective Repeat with a sender window size equal to 4....
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homework _2 - for each of the following cases a Stop and...

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