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Link access procedure

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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)
LAPM (Link Access Procedure for Modems)
LAPF (Link Access Procedure for Frame Relay)

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