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What Is Link Control Protocol (LCP)?

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Consider the Link Control Protocol, also known as LCP, the equivalent of the handshake when two friends first meet. You see, LCP is the first protocol that establishes a connection between two devices in a Point-to-Point Protocol (PPP) link. This is because LCP is the first protocol that uses a link control protocol. Before any data is exchanged over the link, establishing, configuring, and testing it is beneficial. Imagine that you and your friend, whom we'll refer to as "Bob," is attempting to communicate with one another. You both begin by introducing yourself and conversing with one another. Bob will quiz you on various topics, such as "What's your name?" "What's your favorite color?" and "What's your favorite movie?" Comparable to how LCP configures the connection by exchanging control messages to negotiate various choices such as authentication protocols, compression options, and link quality checks, this is analogous to how LCP configures the link. After you and Bob have reached a consensus on everything and are content with the answers provided by the other, you both give each other a firm handshake and exclaim, "All right, let's get this done!" This is analogous to LCP sending a "Protocol-Reject" message to signal that the link is not operational or a "Terminate-Ack" message to show that the link is ending. Both of these messages indicate that the link is being severed. Hold on a second. What if Bob suddenly remarked, "Whoa, hold on! I wouldn't say I like your favorite color. We can't be friends. This is analogous to the situation in which LCP transmits a "Terminate-Request" message to indicate that one party wishes to terminate the link. In this scenario, the proper response would be to send a "Terminate-Ack" to confirm that the relationship has been severed. In the same way that you and Bob can carry on separate discussions after you've shaken hands for the first time, LCP can renegotiate the terms of the relationship during its duration. This process is referred to as "option negotiation." Therefore, LCP is the initial protocol that lays the groundwork for a dependable connection between two devices in a PPP link. LCP sets this foundation. It guarantees that both devices agree on the options that will be utilized, and it can either terminate the link or renegotiate the options if either of those becomes necessary.

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