Question

Consider a two-link network where Host A is connected to the router by a 1 Mbps link with 10 ms propagation delay and the router is connected to Host B by a 15 Mbps link with a 25 ms propagation delay. Host A sends a 1500-byte packet to Host B. What is the transmission delay (in ms) of the packet from Host A to the router?

Answer 1

The transmission delay of a 1500-byte packet from Host A to the router over a 1 Mbps link is calculated to be 12 ms.

Step-by-step explanation:

The transmission delay is the amount of time it takes for the entire packet to be put onto the link. This delay is dependent on the size of the packet and the data rate of the link. You can calculate the transmission delay using the formula:

Transmission Delay = Packet Size / Link Bandwidth

Given that Host A is connected to the router by a 1 Mbps link and Host A sends a 1500-byte packet, first, convert bytes to bits:

1500 bytes * 8 bits/byte = 12000 bits

Next, divide the packet size by the bandwidth to find the transmission delay:

12000 bits / 1,000,000 bits/sec = 0.012 seconds

Since 1 second is 1000 milliseconds (ms), you convert the transmission delay to milliseconds:

0.012 seconds * 1000 ms/second = 12 ms

Therefore, the transmission delay of the packet from Host A to the router is 12 ms.