GIAC
GSEC · Question #186
GSEC Question #186: Real Exam Question with Answer & Explanation
The correct answer is C. L2TP. L2TP (Layer 2 Tunneling Protocol) is the VPN tunneling protocol that uses IPSec for encryption and authentication, making L2TP/IPSec a standard VPN implementation.
Question
Which of the following protocols implements VPN using IPSec?
Options
- ASLIP
- BPPP
- CL2TP
- DPPTP
Explanation
L2TP (Layer 2 Tunneling Protocol) is the VPN tunneling protocol that uses IPSec for encryption and authentication, making L2TP/IPSec a standard VPN implementation.
Common mistakes.
- A. SLIP (Serial Line Internet Protocol) is a legacy point-to-point protocol that provides no encryption or VPN capability whatsoever.
- B. PPP (Point-to-Point Protocol) is a data-link layer protocol used for direct connections; it does not implement IPSec or provide VPN tunneling on its own.
- D. PPTP (Point-to-Point Tunneling Protocol) creates VPN tunnels but uses MPPE (Microsoft Point-to-Point Encryption) for security, not IPSec.
Concept tested. L2TP/IPSec VPN protocol pairing
Reference. https://learn.microsoft.com/en-us/windows-server/remote/remote-access/vpn/vpn-top
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