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Problem 8(5+10 pts ). Answer the following questions on circuit switching packet switching: 1. Give two reasons why (or situations where) a packet-switched network is preferable to a circuit-switched network. 2. Calculate the delay in sending an x-bit message over a k-hop path (i.e., k1 switches reside on the path between source and destination) in a circuit-switched network and in a packetswitched network. Assume that both networks are lightly loaded (i.e., no queueing delay or processing delay); the propagation delay is d sec per hop. The circuit-switched network needs s seconds setup time. The packet-switched network uses a packet size of p bits. Lastly, the data transmission rate is b bps. Under what conditions does the packet network have a lower end-to-end delay? (hint: circuit switches have no transmission delay)