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由于资金有限,在考虑布置网络结构时,多数机构希望能用较少的资金投入,来布置一个简单、高效、安全的网络。以某研究机构为例,其总部设在深圳,同时在北京、上海都设有分支机构。其中,总部有100台计算机,北京分部拥有60多台,上海分部有20多台。三地通过VPN连接,构成了一个内部互联网。网络架构初期,单位领导出于安全考虑,规定所有内部计算机都不允许通过DDN专线上网,如需收发外部邮件和访问互联网,只能拨号上网。
Due to limited funding, most organizations hope to deploy a simple, efficient and secure network with less capital invested in considering the network layout. Taking a research institute as an example, its headquarters is in Shenzhen, and at the same time it has branches in Beijing and Shanghai. Among them, the headquarters has 100 computers, Beijing Branch has more than 60 units, Shanghai Branch has more than 20 units. Three through the VPN connection, constitutes an internal Internet. Early network architecture, unit leaders out of security considerations, requiring all internal computers are not allowed to go online through DDN dedicated to receive and send external mail and access the Internet, only dial-up Internet access.