Pagp and Lacp are the two etherchannel protocols supported by most modern Cisco switches.
A communication protocol is a system of rules that allows two or more entities in a communication system to transmit information about any kind of variation in physical quantities. A protocol defines communication rules, syntax, semantics, synchronization, and possible error recovery procedures.
protocol, in computer science, a set of rules or procedures for transferring data between electronic devices such as computers. In order for computers to exchange information, they must agree in advance how the information is organized and how each will send and receive it.
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