Point-to-Point Protocol (PPP) and MultiLink Point-to-Point Protocol (MLPPP) are layer 2 data-link layer communications protocols used to establish connections between two directly connected nodes.
- Point-to-Point Protocol (PPP) is a layer 2 data-link layer communications protocol
- PPP is used to establish a direct connection between two nodes
- PPP connects two devices, typically routers, directly together without any other devices in between
- PPP can provide authentication, encryption and compression
- MultiLink Point-to-Point Protocol (MLPPP) is two or more PPP connections configured together to aggregate the connections
- On a single PPP line frames cannot arrive out of order, but this is possible when the frames are divided among multiple PPP connections
- Multilink PPP must number the fragments so they can be put in the right order again when they arrive
- PPP can use three different types of authentication:
- Password Authentication Protocol (PAP)
- Challenge Authentication Protocol (CHAP)
- Extensible Authentication Protocol (EAP)
- PPP local authentication refers to PAP
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