Question

3. (8 points) Transmission delay Consider sending N packets each of length L bits from Host A to Host B, as shown in the figure below. Assume that the links between Host A and the Router and between the Router and Host B each has a transmission rate of R bits per second. Assume all buffers are of infinite capacity. Ignore all processing and propagation delays. R R Host A Router Host B (a) (2 points) Express the delay it takes to send 2 packets from A to B as a function of L and R. (b) (2 points) Express the delay it takes to send N packets from A to B as a function of L, N, and R. (c) (2 points) Suppose the transmission rate from Router to Host B is R/2 instead of R. Express the delay it takes to send N packets from A to B as a function of L, N, and R. (d) (2 points) Suppose the transmission rate from Host A to Router is R/2 instead of R. Express the delay it takes to send N packets from A to B as a function of L, N, and R. 3

          3. (8 points) Transmission delay
Consider sending N packets each of length L bits from Host A to Host B, as shown in the figure below.
Assume that the links between Host A and the Router and between the Router and Host B each
has a transmission rate of R bits per second. Assume all buffers are of infinite capacity. Ignore all
processing and propagation delays.
R
R
Host A
Router
Host B
(a) (2 points) Express the delay it takes to send 2 packets from A to B as a function of L and R.
(b) (2 points) Express the delay it takes to send N packets from A to B as a function of L, N, and R.
(c) (2 points) Suppose the transmission rate from Router to Host B is R/2 instead of R. Express the
delay it takes to send N packets from A to B as a function of L, N, and R.
(d) (2 points) Suppose the transmission rate from Host A to Router is R/2 instead of R. Express the
delay it takes to send N packets from A to B as a function of L, N, and R.
3

3. (8 points) Transmission delay
Consider sending N packets each of length L bits from Host A to Host B, as shown in the figure below.
Assume that the links between Host A and the Router and between the Router and Host B each
has a transmission rate of R bits per second. Assume all buffers are of infinite capacity. Ignore all
processing and propagation delays.
R
R
Host A
Router
Host B
(a) (2 points) Express the delay it takes to send 2 packets from A to B as a function of L and R.
(b) (2 points) Express the delay it takes to send N packets from A to B as a function of L, N, and R.
(c) (2 points) Suppose the transmission rate from Router to Host B is R/2 instead of R. Express the
delay it takes to send N packets from A to B as a function of L, N, and R.
(d) (2 points) Suppose the transmission rate from Host A to Router is R/2 instead of R. Express the
delay it takes to send N packets from A to B as a function of L, N, and R.
3

Added by Crystal C.

Question

Please give Ace some feedback