A subprotocol within the Point-to-Point Protocol (PPP) protocol suite that is responsible for link management.
Link Control Protocol (LCP) operates at the data-link layer (layer 2) of the Open Systems Interconnection (OSI) reference model for networking and is considered a data-link layer protocol. During establishment of a PPP communication session, LCP establishes the link, configures PPP options, and tests the quality of the line connection between the PPP client and PPP server. LCP automatically handles encapsulation format options and varies packet sizes over PPP communication links.
LCP also negotiates the type of authentication protocol used to establish the PPP session. Different authentication protocols are supported for satisfying the security needs of different environments. LCP can negotiate the following authentication protocols: