A star network with a hub, and 3 nodes:
Transmission rate R=10Mbps, Frame length L=1000 bits, Cable distances from the hub to the nodes are d1=d2=100 meters, d3=200meters.

Propagation speed is the speed of light.

Derive E in terms of bit-time.
What is E when R=100Mbps? 10Gbps? How does E vary with R?
When the network has an equivalent bus topology, what is E?

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