network cisco ccna gns3 certification arteq

network cisco ccna gns3 certification arteq
a network runs through it

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Tuesday, November 6, 2012

quote of the day, overlay...


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.

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