CompTIA Network+ (N10-008) — Question 559

Two companies want to build an encrypted tunnel between them and use a PSK for initial authentication. Which of the following is the BEST protocol for the companies to use?

Answer options

• A. VPN
• B. SSL
• C. TLS
• D. IPSec

Correct answer: D

Explanation

IPSec is the best protocol for creating an encrypted tunnel between two networks, as it is designed specifically for securing Internet Protocol communications. While VPN, SSL, and TLS can provide security, they do not offer the same level of network layer protection that IPSec does, making it the most appropriate choice in this scenario.