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IPSec VPN confusion with layer 2 and/or layer 3 (OSI model)
Hello,
I was checking out the slides for Cloud Infrastructure Planning and Design Course.
In module 7, it said IPSec can connect two segments using layer 2 protocols.
(and in one of the question of practice test, there is a question that refers to 'linking layer-2 network segments').
I think it should need more explanation on how it could be done using 'layer 2 protocols'.
Case 1:
If IPSec is used as site-to-site VPN, I Personally think IPSec is working / linking two sites in layer 3.
Case 2:
IPSec over MPLS
To my understanding MPLS is an routing protocol and IPSec would working in layer 3 for the encryption.
Case 3:
As I know there is L2TP+IPSec VPN, which L2TP work as an layer 2 tunneling protocol.
I suppose IPSec still work in layer 3 in this case?
VCE-ED
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February 17th, 2016 14:00
The slide should have said layer 3 protocols, not layer 2.
Thank you for bringing this to our attention. This should be corrected in the next course update.
dungkaitai
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February 17th, 2016 18:00
okay, thanks for reply.