What open-source VPN protocol utilizes OpenSSL for encryption and has the ability to possibly cross firewalls where IPsec might be blocked?
A) Layer 2 Tunneling Protocol (L2TP)
B) Point-to-Point Tunneling Protocol (PPTP)
C) Generic Routing Encapsulation (GRE)
D) OpenVPN

Question

Quizplus · Accepted Answer

OpenVPN is the only option listed that fits the description. L2TP and PPTP are both reliant on specific ports being open which makes them more likely to be blocked by firewalls. GRE is not a VPN protocol itself but rather a protocol for encapsulating other protocols within IP packets.

What Open-Source VPN Protocol Utilizes OpenSSL for Encryption and Has