4. a) Consider designing an ATM network with a leaky-bucket policer that ensures a virtual circuit does not send more cells than expected. Suppose a link has a first-in-first-out (FIFO) queue and carries traffic for two virtual circuits. The traffic on the first virtual circuit follows a leaky- bucket policer (with a bucket depth of 9 cells and a token rate of 100 cells/second) and can settle for best-effort service. The traffic on the second virtual circuit follows a leaky-bucket policer (with a bucket depth of one cell and a token rate of 100 cells/second) that cannot tolerate more than 100 milliseconds of delay in delivering each cell. Suppose the propagation delay on the link is 50 milliseconds. Analyse the smallest transmission rate R, in cells per second, that can satisfy the delay constraint, given that the link serves cells in FIFO order.

Computer Networking: A Top-Down Approach (7th Edition)
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Chapter1: Computer Networks And The Internet
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4. a)
Consider designing an ATM network with a leaky-bucket policer
that ensures a virtual circuit does not send more cells than expected.
Suppose a link has a first-in-first-out (FIFO) queue and carries traffic for
two virtual circuits. The traffic on the first virtual circuit follows a leaky-
bucket policer (with a bucket depth of 9 cells and a token rate of 100
cells/second) and can settle for best-effort service. The traffic on the
second virtual circuit follows a leaky-bucket policer (with a bucket depth of
one cell and a token rate of 100 cells/second) that cannot tolerate more
than 100 milliseconds of delay in delivering each cell. Suppose the
propagation delay on the link is 50 milliseconds. Analyse the smallest
transmission rate R, in cells per second, that can satisfy the delay
constraint, given that the link serves cells in FIFO order.
Transcribed Image Text:4. a) Consider designing an ATM network with a leaky-bucket policer that ensures a virtual circuit does not send more cells than expected. Suppose a link has a first-in-first-out (FIFO) queue and carries traffic for two virtual circuits. The traffic on the first virtual circuit follows a leaky- bucket policer (with a bucket depth of 9 cells and a token rate of 100 cells/second) and can settle for best-effort service. The traffic on the second virtual circuit follows a leaky-bucket policer (with a bucket depth of one cell and a token rate of 100 cells/second) that cannot tolerate more than 100 milliseconds of delay in delivering each cell. Suppose the propagation delay on the link is 50 milliseconds. Analyse the smallest transmission rate R, in cells per second, that can satisfy the delay constraint, given that the link serves cells in FIFO order.
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