L2TP operates at which layer?

L2TP operates at which layer?

• A. In data link layer
• B. In network layer
• C. In transport layer
• D. In session layer

Answer: (A)

L2TP operates at the data link layer. It’s named Layer 2 Tunneling Protocol because it creates a tunnel by encapsulating PPP frames for transmission over an underlying network, typically an IP network. This tunneling happens at the data link boundary, not at the network layer (routing), transport layer (end-to-end delivery), or session layer (managing sessions). While the tunnel itself may ride over IP networks using UDP as a transport vehicle, the protocol’s framing and tunneling function are defined at Layer 2, which is why it’s classified as operating at the data link layer.

L2TP operates at the data link layer. It’s named Layer 2 Tunneling Protocol because it creates a tunnel by encapsulating PPP frames for transmission over an underlying network, typically an IP network. This tunneling happens at the data link boundary, not at the network layer (routing), transport layer (end-to-end delivery), or session layer (managing sessions). While the tunnel itself may ride over IP networks using UDP as a transport vehicle, the protocol’s framing and tunneling function are defined at Layer 2, which is why it’s classified as operating at the data link layer.