Abstract: This paper introduced virtual private network technology(VPN)，including its background，idea，superiority，principle，security system and administration of networks.

Abstract: This paper introduced virtual private network technology(VPN)，including its background，idea，superiority，principle，security system and administration of networks.

文摘:简要介绍了虚拟专用网技术（VPN），包括它的背景、概念、优势、工作原理、安全机制和网络管理。