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本期的虚拟场景和本栏目上期相同:一拥有200用户的计算机局域网,出于工作的要求,需要将局域网接入因特网。上期向读者介绍了该虚拟场景局域网接入因特网时路由器的几种选择,本期将围绕接入线路的选择展开。 因特网是世界上规模最大的广域网,同时它也是涉及广域网协议类型最多的网络。目前,常见的广域网有公用电话网、公用分组交换网、公用数字数据网、宽带综合业务数字网、公用帧中继网和其他一些专用网,在计算机网络系统集成项目中,遇到这种情况时大家通常考虑的不外乎这些。在本场景中,用户可以根据自己本身数据流量的大小及数据即时性的要求及所能承担费用的多少进行接入线路的选择。
This issue of the virtual scene and the same period of this section: a 200-user computer LAN, out of work requirements, the need for local area network access to the Internet. The last time introduced to the reader the virtual scene LAN access to the Internet when the router several options, this issue will focus on the choice of access lines. The Internet is the largest WAN in the world and at the same time it is also the network that deals with the widest variety of WAN protocols. Currently, common WANs include public switched telephone networks, public switched packet networks, public digital data networks, broadband integrated services digital networks, public frame relay networks, and other private networks, which are encountered in computer network system integration projects When we usually consider nothing more than these. In this scenario, users can choose their own access line based on the size of their own data traffic, the immediacy of the data, and how much they can afford.