homework _4

homework _4 - c Find the overall throughput of the system...

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Boston University Fall 2009 ECE Department Introduction to Computer Networking (EC 441) Homework #4 Solve the following exercises from the textbook (Kurose & Ross): Chapter 5: P. 6, P.8, P.9 Additional Question 1 (From Exam) B C A Consider a multi-hop wireless network, with logical connections shown above. Node A can interfere (collide) with node B, but not with node C. Similarly, node C can interfere only with node B. Node B can interfere with both nodes A and C. Assume that each node uses the slotted Aloha protocol, with probability of transmission (and retransmission) set to p . a) Find the throughput (utilization) of node A. b) Find the throughput of node B.
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Unformatted text preview: c) Find the overall throughput of the system, which is the sum of utilization of each node. d) Find the value of p that maximizes the overall throughput. Additional Question 2 (From Exam) Three stations share an Ethernet LAN segment. Each station has a new packet to transmit at time t =0. a) What is the probability that all the packets will collide at least once? b) What is the probability that one packet will be successfully transmitted at the second attempt? c) Assume that one packet is successfully transmitted at the second attempt. What is the probability that the remaining two packets are successfully transmitted at the third attempt?...
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This note was uploaded on 11/09/2010 for the course ECE 441 taught by Professor Davidstarobinski during the Fall '09 term at BU.

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homework _4 - c Find the overall throughput of the system...

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