Which protocol secures VPN connections by encapsulating IP packets and providing encryption and authentication?

Which protocol secures VPN connections by encapsulating IP packets and providing encryption and authentication?

• A. TLS
• B. SSH
• C. SSL VPN
• D. IPsec

Answer: (D)

The key idea is securing VPNs at the IP layer by encapsulating IP packets and protecting their contents with encryption and authentication. IPsec does exactly this. In VPN use, it can wrap entire IP packets inside a new IP packet (tunnel mode), then apply encryption to the payload and provide integrity and origin authentication. This combination keeps data confidential and verifies it hasn’t been tampered with as it travels across untrusted networks, making it ideal for both remote-access and site-to-site VPNs. Other options serve different purposes: TLS and SSL VPNs protect data using TLS over application-layer connections rather than encapsulating complete IP packets for the entire network path, and SSH is meant for secure remote access and file transfers. Thus, IPsec is the protocol specifically designed to secure VPN connections by encapsulating IP packets and offering encryption and authentication.

The key idea is securing VPNs at the IP layer by encapsulating IP packets and protecting their contents with encryption and authentication. IPsec does exactly this. In VPN use, it can wrap entire IP packets inside a new IP packet (tunnel mode), then apply encryption to the payload and provide integrity and origin authentication. This combination keeps data confidential and verifies it hasn’t been tampered with as it travels across untrusted networks, making it ideal for both remote-access and site-to-site VPNs.

Other options serve different purposes: TLS and SSL VPNs protect data using TLS over application-layer connections rather than encapsulating complete IP packets for the entire network path, and SSH is meant for secure remote access and file transfers. Thus, IPsec is the protocol specifically designed to secure VPN connections by encapsulating IP packets and offering encryption and authentication.