在网络中，传递数据的时候经常发生差错，可以用汉明编码进行发送，检错，在一定程度上控制差错-control error by hamming code .This is an Engineering Approach to Computer Networking

This document describe the fundamental concept of network simulator-2, a simulation environment for computer networking field of engineering. It covers the descr iption of basic tools and components used in network simulations.

There have been many books written on the topic of computer networking. While many of these are excellent resources for advanced programmers, they tend to be too deep for the beginner who just wants to know how to use it. Why require a potentia