homework _1

homework _1 - A sends the entire message as a single...

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Boston University Fall 2009 ECE Department Introduction to Computer Networking (EC 441) Homework #1 Solve exercises P.6, P.7, P. 12, P. 18, P. 24 from Chapter 1 in the textbook (Kurose/Ross, 4th edition) Additional Question (from exam) : A S B Consider the network depicted in the figure above where nodes A and B are hosts, and node S is a store-and-forward switch. The switch has a very large buffer and never loses packets. Assume that packet overhead (headers, etc.) is negligible. PART I: Suppose that link A Æ S has a bandwidth of 1 Mb/s and propagation delay of 1 ms, and link S Æ B has a bandwidth of 2 Mb/s and propagation delay of 2 ms. Suppose node A has a data message of size 10,000 bits that it wishes to transmit to node B . 1) What is the end-to-end delay if node
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Unformatted text preview: A sends the entire message as a single packet? 2) What is the end-to-end delay if node A sends the message using 10 packets? PART II: Suppose now that link A S has a bandwidth of 2 Mb/s and propagation delay of 1 ms, and link S B has a bandwidth of 1 Mb/s and propagation delay of 2 ms. As before, assume that node A has a data message of size 10,000 bits that it wishes to transmit to node B . Suppose node A sends the message using 5 packets. 3) Plot the number of packets stored in switch S as a function of time (assume a packet enters the switch as soon as the first bit arrives, and leaves the switch only when the last bit is transmitted). 4) Compute the end-to-end delay....
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homework _1 - A sends the entire message as a single...

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