一、背景 (一)网络互连技术概述上世纪70年代,计算机技术和通信技术的进步和相互作用,带动了算机网络的发展。为了把多种不同的物理网络互连起来使它们成为一个统一协调的整体,出现了网络互连(internetworking)技术。它提供异构网络互连的方法及一组通信约定,可以容纳多种不同的硬件技术。这种互连技术屏蔽了许多网络 First, the background (A) Overview of network interconnection technology In the 1970s, advances in computer technology and communications technology and interaction, led to the development of computer networks. In order to interconnect many different physical networks to make them a unified and coordinated whole, internetworking technology has emerged. It provides a heterogeneous network interconnection method and a set of communication protocols that can accommodate a variety of different hardware technologies. This interconnection technology shields many networks