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9 Cards in this Set

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SDLC
Synchronous Data Link Control (SDLC)

Supports Multipoint links. It assumes that the SNA header occurs after the SDLC header.
LAPB
Link Access Procedure Balanced (LAPB)

LAPB is mainly used with X.25
LAPD
Link Access Procedure on the D Channel

LAPD is used by ISDN lines for signaling to set up and bring down circuits.
LAPF
Link Access Procedure for Frame Mode Bearer Services

This is a data-link protocol used over a Frame Relay links.
HDLC
High-Level Data Link Control

HDLC serves as Cisco's default on serial links.
PPP
Point-to-Point Protocol (PPP)

PPP was mean for multiporotocol interoperability from its inception, unlike all the others.
DLCI
data-link common identifier

id used for identifying packets
DCE
DTE
DCE - Data Communications Equipment provides clocking

DTE - Data terminal equipment device that receives the clock.
CSU / DSU
Channel Service Unit / Data Service Unit