Tunnel-Based Virtual Private Networks
A tunnel is a virtual connection that can physically span multiple router hops. However, from the perspective of the traffic flowing through the tunnel, the transit from one end of a tunnel to the other appears to be a single router hop.
Multiple VPN technologies make use of virtual tunnels. A few examples discussed in this chapter include
Generic Routing Encapsulation (GRE)
Dynamic Multipoint VPN (DMVPN)
Multipoint ...
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