有了一套理想的电脑,下一步就是上网了。为了搭上Internet快车,首先你得有一个入口。与所有高速公路一样,每一个入口都有收费点。一般来说,你得到的入口地址相当于一个城市的门牌,而这个“城市”就是你所在单位(学校或研究机构)的微机局域网,它叫LAN。以学校为例。一个学校微机网有多个,一个系为一个LAN.各个系的LAN通过学校的主干网与Internet相连。你在某个系所 With a perfect set of computers, the next step is to get online. In order to catch the Internet Express, you must first have an entrance. Like all freeways, there is a toll point for each entrance. In general, you get the same entry address as a city, and this “city” is the local area network (LAN) of your unit (school or research institute). Take school as an example. A school computer network has more than one, a Department of a LAN. LAN of each department through the school’s backbone network connected with the Internet. You are in a department