Encryption layer(s) in VPN ?

[Polaris]

Hi:

AS I understand it, VPN secures a communication through Internet using
encryption, and encryption can be implemented at many different layers (App
layer-PGP, transport layer-SSL, network layer-IPSec, Datalink layer-L2PT).

My questions is: for a VPN connection, will encryption done at only one of
those layers; or it could be done in multiple layers? What is the most
common way it is done ?

Thanks for your input.

Polaris

 

[Roger Abell]

The VPN itself is implemented with only one of
the technologies. However, you can then also use
such as IPsec to further encrypt the session traffic
that goes through the VPN. The first, the VPN,
is gateway to gateway crypto-tunnel, while that
later is end-point to end-point.

 

[Polaris]

Thanks. VPN can also be a crypto-tunnel between gateway and end-user
(end-point)?

 

[Roger Abell]

VPN can be defined to protect the traffic from the
end-user to the VPN server.