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将局域网(LAN)扩展到大厦之外是件费时费力的工作。广域网(WAN)通过专用线路将不同城市或区建筑物内的局域网连接到一起。而虚拟专用网(VPN)则通过使用Internet而省去了硬件上的连接,并且通过采用某种技术使最
Extending the local area network (LAN) outside the building is a time-consuming and labor-intensive task. Wide Area Networks (WANs) connect local area networks within buildings in different cities or districts through dedicated lines. The virtual private network (VPN) by using the Internet and save the hardware connection, and through the use of some technology so that the most