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Computer Networks - CS132/EECS148 - Spring 2013

Computer Networks - CS132/EECS148 - Spring 2013 Instructor: Karim El Defrawy Assignment 2 Deadline : April 25th 9:30pm (hard and soft copies required) ---------------------------------------- -------------------------------------- Problem 1 (1 points) - What is the difference between pull and push network protocols? Explain the difference by using two example protocols. Pull : HTTP, POP, IMAP : client requests (pulls) data from server Push : SMTP , server sends (pushes) its data to client whenever new data is available Problem 2 - (Chapter 1 problem 31 , 5 points) In modern packet-switched Networks , including the Internet, the source host segments long, application layer messages (for example an image or a music file) into smaller packets and sends the packets into the network.

a) The time to transmit an object of size L over a link or rate R is L/R. The average time is the average size of the object divided by R: The traffic intensity on the link is given by β∆=(16 requests/sec)(.0567 sec/request) = 0.907. Thus, the average access delay is (.0567 sec)/(1 - .907) ≈ .6 seconds. The total average

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