Which of the following statements pertaining to VPN protocol standards is false?

A.
L2TP is a combination of PPTP and L2F.

B.
L2TP and PPTP were designed for single point-to-point client to server communication.

C.
L2TP operates at the network layer.

D.
PPTP uses native PPP authentication and encryption services.

Explanation:
L2TP works at the data link layer, not at the network layer.Incorrect Answers:
A: L2TP is a hybrid of PPTP and L2F
B: Both L2TP and PPTP are designed for single point-to-point connections.
D: PPTP extends and protects PPP connections.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 708