hw9 - Zhou, HuanXian (ID: 0225418) HW9 EE136 Instructor:...

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Zhou, HuanXian (ID: 0225418) HW9 EE136 Instructor: Kang Xi 1. Real-time video communication has several unique characteristics: 1) Dropped frames (pictures) are usually not retransmitted; 2) The data rate is constant; 3) The data frames are ordered. Discuss: a) Why TCP is not appropriate to support real-time video? b) If UDP is used, how to reorder the data frames? a) In TCP, if a packet is lost, it will be resent. That is not handy for applications that rely on real time data handling. b) In UDP, reordering of data frames is not important. The packets that are late will be dropped. 2. Suppose station A simultaneously maintains three TCP connections to station B, C and D. Discuss if station A can use the same TCP port for the three connections? If yes, how does station A distinguish packets from different remote stations? If no, briefly explain why.
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