Activity24 Soln - SOLUTION In-Class Activity #24 4/25/2001...

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ECSE-2660 Computer Architecture, Networks, & Operating Systems, Spring 2001 Page 1 of 3 SOLUTION In-Class Activity #24 4/25/2001 9:48 AM Activity 24.1 Circuit and packet switching. 1. Consider a pair of nodes connected by a network with the following characteristics: Link Bandwidth 100Mbps Round Trip Time (RTT) 100ms a. (8 points) Find the total time needed to transfer a 1,000,000 byte message if the transfer is based on circuit switching with link setup and deallocation times of one RTT each. Hint : Sketch a diagram showing the events as they occur in time. Answer: It takes 100ms to setup the link, plus transfer time for 8 million bits (80ms), plus 100ms to de-allocate the link. Total = 280ms = 0.28 sec. b. (8 points) Calculate the throughput in bits per second. Answer: Throughput is the actual number of “payload” bits that make it, after the overheads. In this case, 8 million bits made it in 0.28 sec, so the throughput = 28.57 Mbs. c. (8 points) Find the number of packets that this message is broken into. Assume that the packet size is 128 bytes, with a payload of 100 bytes. Answer: 10,000packets d. (8 points) Find the total number of bits being sent for case (c) above. Answer: 10,000 packets with 128 bytes each amount to 10,000x128x8 = 10,240,000 bits e. (8 points) Find the total time needed to transfer the 1000,000 byte message if the transfer is based on
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This note was uploaded on 04/25/2010 for the course ECSE ecse-2340 taught by Professor Wozny during the Spring '09 term at Rensselaer Polytechnic Institute.

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Activity24 Soln - SOLUTION In-Class Activity #24 4/25/2001...

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