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CS3331/9331 Computer Networks and Applications Application Layer – Answers Q1) Why is SMTP not used for transferring e-mail messages from the recipient’s mail server to the recipient’s personal computer? Copyright By https://powcoder.com 加微信 powcoder Answer: SMTP is a push protocol; the task of transferring e-mail messages from the recipient’s mail server to the recipient’s personal […]

CS3331/9331 Computer Networks and Applications Introduction – Answers General Probability Questions 1) If there are N students taking COMP 3331/9331, what is the probability that none of them has a birthday on the first day of the class? (Assume there are exactly 365 days in a year) Copyright By https://powcoder.com 加微信 powcoder Answer: Probability that

Quiz: Go-back-N v Consider a GBN protocol with a sender window of 6 and a large sequence # space. Suppose the next in-order sequence number the receiver is expecting is M. At this time instant, which of the following sequence #¡¯s can never be part of the sender¡¯s window? Assume no reordering. B. M+1 C.

CS3331/9331 Computer Networks and Applications Transport Layer (2) – Answers Flags = A Seq. No. = 4677 Ack. No. = 3335 Data: 100 Bytes Flags = A Seq. No. = 3335 Ack. No. = 4777 Data: 40 Bytes Copyright By https://powcoder.com 加微信 powcoder a) The sequence number does not increment by one with each segment.

Quiz: GBN vs. SR Suppose a receiver that has received all packets up to and including sequence number 24 and next receives packet 27 and 28. In response, what are the sequence numbers in the ACK(s) sent out by the GBN and SR receiver respectively? [27,28], [28] [24, 24], [27,28] [27,28], [27,28] [25], [25] [nothing],