What protocol does a VPN use to encapsulate IP packets over a public network?

A Virtual Private Network (VPN) commonly utilizes tunneling protocols to secure and encapsulate IP packets for transmission over a public network. Among the various options listed, the Point-to-Point Tunneling Protocol (PPTP) is indeed one of the protocols used for this purpose.

PPTP functions by creating a direct connection between two points, typically a user and a VPN server, allowing data to traverse the public internet in a secure manner. It encapsulates data packets using a control channel, ensuring that the information is transmitted securely while preventing unauthorized access during transit. This makes it a suitable choice for VPNs aiming to protect data integrity and confidentiality.

While there are other protocols available for similar purposes, PPTP is recognized for its simplicity and ease of implementation, making it a popular choice despite some security limitations compared to newer and more secure protocols.