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Spelling: X.25

ITU-T standard that defines how connections between DTE and DCE are
maintained for remote terminal access and computer communications in
PDNs. X.25 specifies LAPB, a data link layer protocol, and PLP, a
network layer protocol. Frame Relay has to some degree superseded
X.25. See also Frame Relay, LAPB, and PLP.(Source: CISCO)

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