Addressing, packet and protocols
What is a protocol?
A communications protocol is a system of digital message formats and rules for exchanging those messages in or between computing systems and in telecommunications. A protocol may have a formal description. Protocols may include signaling, authentication and error detection and correction capabilities.
A protocol definition defines the syntax, semantics, and synchronization of communication; the specified behavior is typically independent of how it is to be implemented. A protocol can therefore be implemented as hardware or software or both. Communications protocols have to be agreed upon by the parties involved. To reach agreement a protocol may be developed into a technical standard.