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Link Control Protocol (LCP)

Last updated: August 18, 2011

Link Control Protocol (LCP) is the core component of Point-to-Point Protocol (PPP) network communication. It is responsible for controlling the PPP links for PPP suite protocols' complete operation. It is implemented at Data Link Layer in OSI model.

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LCP takes part in controlling, managing and terminating PPP links through the following LCP frame sets:

  • Link Configuration: This establishes and configures links and verifies peer identification.
  • Link Maintenance: This estimates optimal data packet sizing and verifies configuration errors.
  • Link Termination: This terminates connections if available resources exceed requirements.


Data links must be approved by LCP prior to network transmission.

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