Types of VPNs

["Imran K" <ikhan () eudoramail com>]

Greetings, 

I am looking for conceptual pointers about VPNs.

Things like,

(1)Types of VPNs, (2) Difference in both types of tunnels (AH/ESP), (3) difference in implentation and their behavior 
in a production environment for both types of VPNs, (4) Single tunnel v split tunnel and can this be implemented in 
both type of tunnels?

If some out there could give me some pointers that will be very helpful

Cheers, 

I




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