Connection, protocol, data.
Network communication protocol comprises three elements.
- Semantics, explain the meaning control information for each section. It specifies what actions need to send control information, and the completion of what response to make.
- Syntax, structure and format of user data and control information, and the order of data appears.
- Timing, detailed description of the sequence of events.
Can vividly describe these three elements: semantic representation of what to do, how to do grammar represents the timing indicates the order done.
Semantics: instruction set; - what to do
Syntax: expression directive; - how to express
Timing: the context of the instruction set of the set; - how do