现在运行着的因特网,是上个世纪70年代从美国开始,将各大学、各研究机构的局域网互联起来的产物,最初没有商业运营的成分在内。在设计上假定使用者不会去攻击网络,会自觉使用能够适应网络条件、防止网络拥堵的传输层协议,总之会尽力避免让自己赖以开展研究工作的互联网络瘫痪。 The Internet now operating is the product of the United States in the 1970s that interconnected the local area networks of universities and research institutes, initially without commercial operations. In the design, users are not supposed to attack the network. They will consciously use the transport layer protocol that can adapt to network conditions and prevent network congestion. In short, they will try their best to avoid paralyzing the Internet that they rely on for their research work.