A protocol is an agreed set of rules and message formats that govern how two or more parties exchange information or coordinate behaviour. It defines the syntax, semantics, timing and error handling needed for systems to interoperate reliably without prior bespoke arrangement. Protocols underpin networking, distributed systems and many forms of machine-to-machine and human-to-machine interaction.
Overview
- A protocol specifies what messages may be exchanged, in what order, and how parties react to each message and to errors.
- Layered protocol stacks let higher-level concerns build on lower-level guarantees, as in the internet protocol suite.
- Well-defined protocols are the foundation of interoperability between independently built systems.
Key aspects
- Syntax: the structure and encoding of messages.
- Semantics: the meaning of messages and the state changes they cause.
- Timing and sequencing: handshakes, retransmission and flow control.
- Error handling and versioning for graceful evolution.
Applications
- Network communication across heterogeneous devices and vendors.
- Distributed consensus and coordination among nodes.
- Application interfaces and remote procedure calls.
- Secure exchange through cryptographic handshakes.
Provenance
- This class was materialised to resolve existing inbound references in the knowledge graph.