Exercise 4 1. Prove that the total number of links in a point-to-point network with N computers is (N2-N)/2 2. For each of bus, star and ring topologies,

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Exercise 4 1. Prove that the total number of links in a point-to-point network with N computers is (N2-N)/2 2. For each of bus, star and ring topologies, discuss the consequences if a station has broken. 3. In most technologies, a sending station can choose the amount of data in a frame, but the frame header is a fixed size. Calculate the percentage of bits in a frame devoted to the header, trailer and preamble for the largest and smallest Ethernet frame. 4. Assume a one megabyte file must be send from one computer to another (both are connected to a same 10BaseT Ethernet). What is the minimum time to send the file across the network? What is the minimum time across a Fast Ethernet? Across a gigabit Ethernet? 5. Give the definitions and examples of unicast, broadcast and multicast, respectively.