Question

a) The delay d in circuit switching is different than that of packet switching. Derive expression for d in
sending an x-bit message over a k-hop path in a circuit-switched network and in a packet-switched
network. The circuit setup time is s sec, the propagation delay is d sec per hop, the packet size is p bits
and the data rate is b bps. Summarize the conditions under which the packet network have a lower
delay. Also, infer the conditions under which a packet-switched network is preferable to a circuit
switched network.
b) A cable company decides to provide Internet access over cable in a neighborhood consisting
of 500 houses. The company uses a coaxial cable and spectium allocation allowing
10 Mbps downstream bandwidth per cable. To attract customers, the company
decides to guarantee at least 0.5 Mbps downstream bandwidth to each house at any
time. Summarize the cable company requirements in order to provide this guarantee.​

Answer 1

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