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hwk3-sol-2

Course Number: CEN 4500, Fall 2009

College/University: University of Florida

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CEN 4500C Computer Networks Fundamentals Instructor: Prof. A. Helmy Homework 3: Transport Layer (including reliability, flow/congestion control) Date Assigned: Oct 10, 2007. Due Date: Oct 18th, 2007 (beginning of lecture) Total (max) points: 115 R3. For a TCP connection between Host A and Host B, the TCP segments from A to B have source port number x and destination port number y. What are the source and...

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4500C CEN Computer Networks Fundamentals Instructor: Prof. A. Helmy Homework 3: Transport Layer (including reliability, flow/congestion control) Date Assigned: Oct 10, 2007. Due Date: Oct 18th, 2007 (beginning of lecture) Total (max) points: 115 R3. For a TCP connection between Host A and Host B, the TCP segments from A to B have source port number x and destination port number y. What are the source and destination port numbers for the segments sent from B to A? (2 points) Source port number y and destination port number x. R4. Describe why an application developer might choose to run an application over UDP rather than TCP. Give examples of such applications. (4 points) An application developer may not want its application to use TCPs congestion control, which can throttle the applications sending rate at times of congestion. Often, designers of IP telephony and IP videoconference applications choose to run their applications over UDP because they want to avoid TCPs congestion control. Also, some applications do not need the reliable data transfer provided by TCP. R5. Why is it that voice and video traffic is often sent over TCP rather than UDP in todays Internet? (Hint: not because of TCPs congestion-control mechanism) (4 points) Since most firewalls are configured to block UDP traffic, using TCP for video and voice traffic lets the traffic though the firewalls. [more: Technically speaking, UDP would provide a better trade-off since v...
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