Question 11 A client host sends a W = 800-byte file to a server which is L = 1200 km away over a B = 2.5 Gb/s optical fibre network. (i) Calculate the upper bound of the link efficiency (LEUB) for this transmission assuming that the speed of light in optical fibre is c = 200,000 km/s. [30%] (ii) What would be the LEUR for a link with transmission speed B = 2.5 Mb/s? Explain why the results for the calculated values of LEUR are different. [30%] (iii) Calculate the necessary size of the file W which will allow to achieve a 50% LEUR for a link you considered in part (i). [40%] Question 12 (i) Apply Dijkstra algorithm to compute the shortest path from a node B to all other nodes in the network shown in Figure 12.1. The numbers on each line shows the cost of the corresponding line. Show in a table or describe in the text each step undertaken in the calculations. The final routing table should show the obtained routes and their costs. A K 2 B D 5 C H [100%] 5 E 2 2 3 5 6 3 3 LL F Figure 12.1 6 G K