What is GRE (Generic Routing Encapsulation) in PPTP? - Networking

What is GRE (Generic Routing Encapsulation) in PPTP?

Generic Routing Encapsulation is a protocol for Point-to-Point Protocol. The encapsulation of a variety of network layer protocol packet types inside IP tunnels is done by GRE. This is done by creating virtual point-to-point link to routers which are pointed over an IP internetwork. It is completely stateless protocol based. Soon after it is configured, the GRE tunnel interface comes up and stays up until a valid tunnel resource address or interface is up.
What is CHAP (Challenge-Handshake Authentication protocol)? - Networking
Challenge-Handshake Authentication Protocol authenticates to an authenticating entity of a user or network.......
What is PAP (Password Authentication Protocol)? - Networking
Password Authentication Protocol is one of the simple authentication protocols which are used for the purpose of authenticating a user to a network access server........
What is Authentication header (AH) protocol? - Networking
Data origin authentication, data integrity and replay protection are provided by the Authentication Header protocol......
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