The correct answer is Point-to-Point Tunneling Protocol.The PPTP is a point-to-point tunneling protocol.PPTP Description:It is a network that can be used over the internet from a remote location.It is treated as a standard that is used to connect two virtual networks.It is a more developed version of PPP (point-to-point transmission protocol)Peer-to-peer refers to the virtual networks that are connected using PPTP.The PPTP is encapsulated inside the TCP/IP and this encapsulation is also known as tunneling. This provides a facility of direct connection is established using the internet but tunneling creates a direct link between nodes.It is fast and secure.It uses the client/Server model to communicate. It also works on the data link layer.Additional InformationSeveral important types of Protocols:Transmission Control Protocol (TCP)Internet Protocol (IP)User Datagram Protocol (UDP)Post office Protocol (POP)Simple mail transport Protocol (SMTP)File Transfer Protocol (FTP)Hyper Text Transfer Protocol (HTTP)Hyper Text Transfer Protocol Secure (HTTPS)