computer network( test series)

Question

Q.1)A system has K layer hierarchy protocol application generates a message of l bytes at each of the layer and c byte of header is added the fraction of the network bandwith used on this message..................

a) l/(l-k*c)

b)l/(l+k*c)

c) l/$(l+k*c)^{s}$

d) none of these

Comments

B is correct option

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Is efficiency= useful data/ total data????

yes 

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got it.i forget the basic definition of efficiency.