Computer network protocol, said the computer network of each relevant communication rules agreed upon among the entities in the collection, the agreement has three elements:
Semantics (Semantics) : (1) to explain the meaning of the protocol elements, elements of different types of protocols of semantic rules are different, for example, need a kind of control information, what kind of finish and get a response, etc.,
(2) the grammar (Syntax) : the agreement will be a number of elements and data together to express a complete content should follow the format, which is actually the information structure of data for a regulation, for example, the structure and format of user data and control information, etc.,
(3) sequence (Timing) : sequence of events implementation details, for example, when the two sides to communicate, send a data packet sending point, if the target correctly received, receive correct answer source point; If received the wrong information, the request source point heavy hair a,
Thus it can be seen that protocol is used by network communication in a language,