前言：网络基础是现代通信和信息技术的基石，涉及数据传输、网络协议、路由、交换、网络设备以及网络安全等多个方面，深入了解网络基础，不仅能提升技术能力，还能为更复杂的网络架构与应用打下坚实的基础。

If you were lucky enough to have internet access in the early '90s, it was likely through a Unix shell account over a dialup ...