Which of the following is NOT a VPN communications protocol standard?

A.
Point-to-point tunneling protocol (PPTP)

B.
Challenge Handshake Authentication Protocol (CHAP)

C.
Layer 2 tunneling protocol (L2TP)

D.
IP Security

Explanation:
The Challenge Handshake Authentication Protocol (CHAP) is used for authentication only. It is not a VPN
communications protocol.
Incorrect Answers:
A: The Point-to-Point Tunneling Protocol (PPTP) is a method for implementing virtual private networks.
C: Layer 2 Tunneling Protocol (L2TP) is a tunneling protocol used to support virtual private networks (VPNs).
D: IP Security, Internet Protocol Security (IPsec), can be used to setup secure VPN connections.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 683