In addition to high bandwidth simulation, high quality video must overcome the imperfect world of IP networks. There is another very important factor that must be designed for: The imperfect world of IP networks. Network impairments are expected in bandwidth simulation and IP communications. Network delays, dropped packets, traffic congestion, reordered packets, fragmented packets, and duplicated packets are all facts of life in IP communications and bandwidth simulation. Many higher level protocols such as TCP are designed with error correction mechanisms to ensure that data is moved nearly error free from point to point. TCP bandwidth simulation dictates that endpoints resend packets when errors.
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