Since UDP is a reliable network protocol, what use value or necessary? Actually otherwise, in some cases the UDP protocol may become very useful. Because the UDP with TCP exceed speed advantage. Although the TCP protocol implanted in the various security function, but in the actual execution process will take up a lot of system cost, undoubtedly makes the speed have been seriously affected. Reviewing the UDP due to eliminate the information reliable transmission mechanism, safety and sorting and so on function over to the upper application to complete, greatly reduce the execution time, make the speed was assured.
UDP protocol about the earliest standard is RFC768, released in 1980. Although time is very long, but the UDP protocol in mainstream application continues to play a role. Including video conference system, many applications have proved that the UDP protocol existence value. Because the relative to the reliability speaking, these applications pay more attention to the actual performance, so in order to obtain better use effect (for example, the higher picture frame refresh rate) often can sacrifice certain reliability (for example, the picture quality). This is the UDP and TCP two agreement weigh the place. According to different environment and characteristics, and two kinds of transfer protocol will in the future network in the world play more important role
