Any one could help me about that questıon?
A bank has its head office in the financial district in the middleof a city. It has six branches, three in the north of the city andthree in the south all 5 km from the centre and spaced 3 km apart. Thebank wishes to link all its branches via private leased lines but must decide between providing an individual line to each branch of via a numberofinter-branchlinksandasmallernumberofmultiplexedlines to the centre. If a modem costs £100, a multiplexer/demultiplexer costs£200andleasedlinescost£100perkmperyeartorent,suggest a design that will yield the most cost effective solution if the installation is to remain in operation for fouryears.
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