Topic

Network Delay

6 questions in this topic.

2013 Q1(a)Application LayerNetwork Delay· 4 marks

List two causes of network latency (i.e. delay in sending data). For each of the causes you list, explain how the latency due to that cause is calculated.

latencytransmissionpropagation

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2013 Q1(b)Application LayerNetwork Delay· 5 marks

You want to send 10GBytes of videos to a friend. You have a choice of burning them to DVD and sending by express post, which will take 1 day (24 hours) for them to arrive or you can send them by Internet on which you get an average upload data rate of 2Mb/sec. Show which method will be faster. You must show your work, no marks for just guessing an answer.

latencythroughputunit conversion

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2014 Q1(b)(i)Application LayerNetwork Delay· 4 marks

Two delays that contribute to the total end-to-end delay in networks are propagation delay and transmission delay. Explain what these two delays are and show how to calculate these delays.

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2014 Q1(b)(ii)Application LayerNetwork Delay· 2 marks

Two delays that contribute to the total end-to-end delay in networks are propagation delay and transmission delay. What two other delays contribute to the total end-to-end delay in networks?

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2015 Q1(c)(i)Application LayerNetwork Delay· 6 marks

You are building a communication network based on RFC 1149 "IP over avian carrier". You attach two 128GB flash drives to your pigeon. You can write data to the flash drive at the rate of 20 MB/s and you can read data from the flash drive at the rate of 50MB/s. The flying speed of a pigeon is 80km/h and pigeons do not need to stop for food or rest before reaching destination. What is the total time needed for you to send and your friend who lives in Brazil (Rio is 13600 km from Adelaide) to receive a 4 ∗ 10^9 bit file of your favourite home movies? Solve for the number of seconds delay. Show your work.

latencyRFC 1149unit conversion

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2015 Q1(c)(ii)Application LayerNetwork Delay· 4 marks

You are building a communication network based on RFC 1149 "IP over avian carrier". You attach two 128GB flash drives to your pigeon. You can write data to the flash drive at the rate of 20 MB/s and you can read data from the flash drive at the rate of 50MB/s. The flying speed of a pigeon is 80km/h and pigeons do not need to stop for food or rest before reaching destination. Under what conditions would IP over avian carrier have a lower propagation delay or transmission delay than using the Internet? Explain your answer.

latencythroughputRFC 1149

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