Weekly CISSP Exam Questions
Which of the following is NOT a commonly used VPN protocol?
A. IPsec
B. L2TP
C. SMTP
D. OpenVPN
Answer: C
Explanation:
SMTP (Simple Mail Transfer Protocol) is an email protocol and not a VPN protocol.
- IPsec: Internet Protocol Security, commonly used for VPNs.
- L2TP: Layer 2 Tunneling Protocol, often used in combination with IPsec.
- SMTP: Not a VPN protocol, it's an email protocol.
- OpenVPN: An open-source VPN protocol using SSL/TLS for key exchange.

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