Description: UDP right QQ is so important. UDP and TCP is a layer with the agreement through the IP layer data. . . Forget it, do not pull these. UDP is aimed at not necessarily guarantee that the data transmission to an agreement. Because IP is will be randomly discarded, TCP to ensure reliable data, and will consume a large amount of resources, but to Socket shelves after link will be maintained for a structure. QQ link itself is not maintained, reliable data to verify themselves, but QQ, the data packets are, in particular to adapt the structure of UDP. Finally for multicast, UDP is the only viable network bandwidth to reduce the burden of agreement
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