A 1000-bit packet arrives at a packet switch and finds 10 other packets waiting

Question

A 1000-bit packet arrives at a packet switch and finds 10 other packets waiting to be transmitted on the outgoing link. Assuming the transmission rate of the outgoing link is 5000 bits/second, what is the queuing delay experienced by the newly arrived packet? Show work, not just the final answer. Suppose the round-trip time between a browser and a web server is RTT = 0.06 seconds. A page consists of a base html document that references 10 images in jpg format. Neglecting the transmission times required for the base page and the images, how much time elapses from when the user enters the URL of the base page in the browser until the page can be displayed by the browser assuming Non-persistent connections Persistent connections Show work, not just the final answer. Attach a SINGLE Word or PDF document containing your submission. Scans of handwritten solutions are allowed provided they are of excellent quality and embedded within a SINGLE PDF of Word document.

Explanation / Answer

1. T= X/C = Queuing delay by a packet = Data / Transmission rate = 1000/5000 = 0.2 seconds

Queuing delay experience by the newly arrived packet is 0.2 * 10 = 2 seconds

2. a. Time elapse for non persistant connection for the given problem is calculated as ,

Time elapse = RTT(TCP establishment ) + RTT (HTML base file ) = 0.12 , total time elapse = (N+1) *T = (10+1) * 0.12 = 1.32 seconds

b. Time elapse for persistant connections is given by ,

Time elapse = RTT(TCP establishment ) + RTT (HTML base file ) = 0.12 , Total time elapse = T + RTT = 0.18 seconds

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