Question

A Packet Is Sent From Router A To Router B Over A Link With A Distance 1500 Km (Propagation Speed 2.5x108 M/S). When The PacA packet is sent from router A to router B over a link with a distance 1500 km (propagation speed 2.5x108 m/s). When the packet arrives at router A, one other packet is halfway done being transmitted on this outbound link and three other packets are waiting to be transmitted. Suppose all packets are 1,500 bytes and the link rate is 5 Mbps. Each packet is processed when it arrives at a router, and the packet processing delay is 0.2 ms.

Please calculate the following delays in ms (millisecond), and fill in the blank spaces below: (please fill in numbers only in the space. For example, if the answer was 1.2 ms, please fill in 1.2 in the space provided)

Queueing delay at router A = ms

Transmission delay at the link = ms

Propagation delay at the link = ms

The nodal delay from the time the packet enters router A until the packet arrives at router B (not processed yet) = ms

Given that the packet arrival rate is 150 packet/s, calculate the traffic intensity for this link.
Answer: % (fill in integer percentage value, e.g. fill in 35 for 35%)ket Arrives At Router A, One Other Packet Is Halfway Done Being Transmitted On This Outbound Link And Three Other Packets Are Waiting To Be Transmitted. Suppose All

Answer 1

The queueing delay at router A is 1.5 ms, the transmission delay at the link is 6 ms, the propagation delay at the link is 6 ms, and the nodal delay from router A to router B is 13.5 ms. The traffic intensity for this link is 0.45.

Step-by-step explanation:

To calculate the queueing delay at router A, we need to determine the time it takes for all the packets in front of the arriving packet to be transmitted. Since each packet is 1500 bytes and the link rate is 5 Mbps, the transmission time for each packet is:

Transmission time = packet size / link rate = 1500 bytes / (5 Mbps/8) = 3 ms

There is one packet halfway done being transmitted, so the queueing delay can be estimated as:

Queueing delay = transmission time / 2 = 3 ms / 2 = 1.5 ms

The transmission delay at the link can be calculated using the distance and propagation speed:

Transmission delay = distance / propagation speed = 1500 km / (2.5x10^8 m/s) * 1000 = 6 ms

The propagation delay at the link can be calculated using the distance and propagation speed:

Propagation delay = distance / propagation speed = 1500 km / (2.5x10^8 m/s) * 1000 = 6 ms

The nodal delay is the sum of the queueing delay, transmission delay, and propagation delay:

Nodal delay = queueing delay + transmission delay + propagation delay = 1.5 ms + 6 ms + 6 ms = 13.5 ms

The traffic intensity for this link can be calculated using the packet arrival rate and the transmission time:

Traffic intensity = packet arrival rate * transmission time = 150 packet/s * 3 ms = 0.45