In the OSI model, where does PPTP encryption take place?
A.
Transport layer
B.
Application layer
C.
Data link layer
D.
Network layer
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C
Point-2-Point Tunneling occurs at the transport layer, uses TCP port 1723 (generally)
It’s a tunnelling protocol. It creates a layer 2 tunnel at layer 4. The encryption is applied within the tunel, so that is layer 2 or data link layer.
Think of it this way, it’s creating a VPN, or a virtual LAN connection to your network. The LAN connection is a layer 2 (data link layer) connection. So, the PPTP connection (the traffic inside the PPTP) is layer 2 also.
L2TP also works this way.
IPSec is at the network layer (layer 3).
C is correct.
Appreciate your detailed explained: Layer 4 implementation of a layer 2 tunnel.