{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

hw9_solution - hw9_solution 1 Realtime video communication...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
hw9_solution.txt Page 1 1. Realtime 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 realtime video? b) If UDP is used, how to reorder the data frames? A. a) First, TCP retransmits dropped packets, which is not needed in realtime video streaming. Second, TCP responds to congestion by decreasing the transmission rate, which is negative to video streaming that requires constant rate. b) UDP does not provide sequence numbers, therefore, it is not able to handle packet mis-order. A simple way is to design a protocol that gives sequence numbers and performs reordering and let it run on top of UDP. 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.
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern