CompTIA Security+ Exam Prep

Answer: C - VPN tunnels through a public network, providing higher security than an ordinary Internet connection. Once authenticated to the VPN server, users can virtually access the private network in a safe and secure manner.

VPN uses the shared public infrastructure while maintaining privacy through security procedures and tunneling protocols. It mostly uses the Layer Two Tunneling Protocol or L2TP for tunneling. The protocols encrypt data at the sending end and decrypt it at the receiving end. VPNs are often installed by organizations to provide remote access to a secure organizational network.