Link Access Procedure (LAP) protocols are data link layer protocols for framing and transmitting data across point-to-point links. LAP was originally derived from HDLC (High-Level Data Link Control), but was later updated and renamed LAPB (LAP Balanced).
LAPB is the data link protocol for X.25. Other related LAP protocols are: MLP (Multilink Procedure) LAPD (Link Access Prodecure D-channel) LAPM (Link Access Procedure for Modems) LAPF (Link Access Procedure for Frame Relay)
References
External links Cisco Frame Relay documentation X.25 Overview