ECE369v6-HW1K

# ECE369v6-HW1K - Department of Electrical and Computer...

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Department of Electrical and Computer Engineering University of Massachusetts Dartmouth ECE 369 Computer Networks HW1 Key : Computer Networks & the Internet [Kurose & Ross v6] ECE369v6-Ch1.ppt: Network Core: packet switching versus circuit switching [24~31] Performance of Packet-Switched Networks: delay, loss, & throughput [42~54] Internet Protocol Stack: 5 layers & best-effort service model [58~62] P4. Consider the circuit-switched network in Figure 1.13 (of Section 1.3 The Network Core) . Recall that there are 4 circuits on each link. Label the four switches A, B, C and D, going in the clockwise direction. a. What is the maximum number of simultaneous connections that can be in progress at any one time in this network? b. Suppose that all connections are between switches A and C. What is the maximum number of simultaneous connections that can be in progress? c. Suppose we want to make four connections between switches A and C, and another four connections between switches B and D. Can we route these calls through the four links to accommodate all eight connections? Figure 1.13 A simple circuit-switched network consisting of 4 switches & 4 links Solution: A B D C

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a. Between switches A and B, we can have 4 simultaneous connections since the link AB has 4 circuits. Similarly, we can have 4 simultaneous connections between each of the 3 other pairs of adjacent switches: B-C, C-D, and D-A. Thus, this network can support up to 44 = 16 simultaneous connections. b. Between switches A and C, we can have a set of 4 connections passing through switch B and another set of 4 connections passing through switch D, giving a total of 8 simultaneous connections between switches A and C.
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• Spring '14
• Computer Networks, Public switched telephone network, simultaneous connections

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