from:
VPNs Illustrated: Tunnels, VPNs, and IPsec
By
Jon C. Snader
the next time someone mentions overlay, look at them like they have five heads and say:
The fundamental mechanism that allows us to have secure communications
in the Internet is the notion of a tunnel. As we'll see, tunnels are a
way of overlaying a logical or virtual network on top of a physical
network. Once we have such a tunnel, we can secure it by encrypting and
authenticating the network traffic that flows through it, thus
recreating the security of private leased lines.
network cisco ccna gns3 certification arteq
a network runs through it
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