Almost every book describes the application layer in the OSI model and says "identifies communication partners,identifies quality of service,considers user authentication and privacy and determines if adequate resources are present."
And they mention a couple of protocols in this layer like FTP,SMB ,etc.
How does the application layer identify communication partners?consider user authentication and privacy?determine if adequate sources are present? How does this exactly happen? If someone would elaborate I would appreciate this a lot.
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