Protocol Architecture

Protocol Architecture

Instead of having a single Module for performing communication, there is a structured set of modules that implement communications function" This structure is called Protocol Architecture Let's explain it by an example of File transfer system. Simplified File Transfer Architecture the above example File transfer could use three modules    File transfer application    Communication service module    Network access module ™   File transfer application File Transfer contains all of the logic is unique to the file transfer application such as:    Transmitting passwords    File Commands    Checking File System on other machine if it is ready    Check File System Compatibility          File records ™   Communication service module Instead  of  allowing  File  Transfer  Module  to  deal  with  actual  transfer  of  data  and commands, we can have a separate module for this transfer. This module must make sure that the receiver system is ready to receive and look into the reliable exchange of data ™   Network access module Nature of the exchange between systems is independent of the network that connects them.  That  allows  us  to  have  a  3rd  module  that  handles  the  details  of  the  Network interface and interacts with the network. If Network to be used changes, only Network access Module has to change