一、分组交换 1.分组交换网 分组交换是以分组为单位进行传输和交换的,是一种存储一转发交换方式。也就是说,分组交换将到达交换机的分组先送到存储器暂时存储和处理,等到相应的输出电路有空闲时再送出。实施分组交换的网络称为分组交换网。分组交换网一般由分组交换机、用户终端、分组装拆设备、网络管理中心以及传输线路等几部分构成。下面分别介绍。 First, packet switching 1. Packet switching network packet switching is packet-based transmission and exchange, is a storage-forwarding exchange. In other words, the packet switch to the switch packet sent to the memory temporarily stored and processed, wait until the corresponding output circuit free when sent. The implementation of packet switching network called packet-switched network. Packet switching network is generally composed of packet switches, user terminals, subassembly and disassembly equipment, network management center and transmission lines and other parts. Introduced below separately.