Consider a source computer (S) transmitting a file of size 106 bit to a destination computer (D) over a network of two routers (R1 and R2) and three links (L1 , L2 and L3 ). L1 connects S to R1 ; L2 connects R1 to R2 and L3 connects R2 to D. Let each link be of length 100 km. Assume signals travel over each link at a speed of 108 m/s. Assume that the link bandwidth on each link is 1 Mbit/s. Let the file be broken down into 1000 packets each of size 1000 bits. Find the total sum of transmission and propagation delays in transmitting the file from S to D?

Consider a source computer (S) transmitting a file of size 106 bit to

1.	Consider a source computer (S) transmitting a file of size 106 bit to a destination computer (D) over a network of two routers (R1 and R2) and three links (L1 , L2 and L3 ). L1 connects S to R1 ; L2 connects R1 to R2 and L3 connects R2 to D. Let each link be of length 100 km. Assume signals travel over each link at a speed of 108 m/s. Assume that the link bandwidth on each link is 1 Mbit/s. Let the file be broken down into 1000 packets each of size 1000 bits. Find the total sum of transmission and propagation delays in transmitting the file from S to D?
A.	1005 ms
B.	1010 ms
C.	3000 ms
D.	3003 ms
Answer» B. 1010 ms

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