The Difference between Agreement and Agreement stack

Protocol definition is a column of communication annotation, communication of the two sides need to be common in accordance with this standard in computer communication, communication data communication protocol is used to realize the annotation between the computer and network connection, if there is no unified communication protocol, information transmission between the computer cannot be identified, communication protocol is communication rules, can be simply understood as each computer conversation using common language.

The protocol stack refers to the specific implementation form of the protocol, we generally speaking is the library function implemented with code, so as to facilitate the call of developers. The protocol stack is the sum of each layer protocol in a network, which reflects the file transfer process in a network; from upper protocol to bottom protocol and then from bottom protocol to upper protocol.

Network designers use a hierarchical network architecture, the two-host communication process, including switching equipment, the protocol works like the stack, so it is called the protocol stack.

Host a: Application layer- -> Transmission layer- -> Network layer- -> Data Link layer- -> Physical layer, corresponding host b: Physical layer- -> Data Link layer- -> Network layer- -> Transmission layer- -> Application layer

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