SSCP Question #817: Real Exam Question with Answer & Explanation

The correct answer is A: Data link layer. PPTP operates at Layer 2 (Data Link Layer) of the OSI model. It works by encapsulating PPP (Point-to-Point Protocol) frames - itself a Layer 2 protocol - into IP packets for transmission across networks. Because PPTP's primary role is to tunnel PPP frames, its functional layer is

Submitted by yuki_2020· Apr 18, 2026Network and Communications Security

Question

What layer of the OSI/ISO model does Point-to-point tunnelling protocol (PPTP) work at?

Options

AData link layer
BTransport layer
CSession layer
DNetwork layer

Explanation

PPTP operates at Layer 2 (Data Link Layer) of the OSI model. It works by encapsulating PPP (Point-to-Point Protocol) frames - itself a Layer 2 protocol - into IP packets for transmission across networks. Because PPTP's primary role is to tunnel PPP frames, its functional layer is the Data Link Layer. This distinguishes it from purely network-layer (Layer 3) VPN protocols like IPsec, which operate at a higher level in the stack.

Topics

#Networking Protocols#OSI Model#PPTP#Data Link Layer

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