早期互联网开发者发现 数据和信息分解成小块，分批发送，然后再合并，可以更有效率的传输 。 这些块就叫数据包（packets）。
The early creators of the Internetdiscovered that data and information could be sent more efficiently when brokeninto smaller chunks, sent separately, and reassembled.
事实上，复制信息可能是整个过程中最简单的部分，但是选择合适的工具将直接影响到信息传输的有效性和效率。
Actually copying the information is probably the simplest part of the process, but choosing the right tool can make a big difference to how effectively and efficiently the information is transferred.
组播会话描述信息的有效组织、会话通告的传输效率以及组播会话的安全管理都成为问题。
On the other hand, how to organize the session description information effectively, transmit session announcement efficiently, and secure the session are more and more of a problem.
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