September 2001
Intermediate to advanced
400 pages
11h 23m
English
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OSI Layers
The OSI model outlines seven layers: application, presentation, session, transport, network, data link, and physical. The first three layers define and implement domain-specific exchanges between hosts. The last four layers provide for the more-or-less reliable end-to-end transmission between the local process and a remote.
Application Protocols
Application protocols allow the network application to exchange domain-specific data with a network application running on a remote host. For a file transfer application, the domain-specific data is the files and their properties. In a daytime application, the domain-specific data is the current date and time.
An application protocol is a pre-agreed syntax of commands and responses that allow the two processes to exchange this domain-specific data. Our file transfer application uses the File Transfer Protocol (FTP), which was defined in RFC 959. The daytime application uses the Daytime Protocol (DTP), which is defined in RFC 867. Both protocols date back to the ARPA days of the Internet.
The application layer is also responsible for providing an interface to external systems, such as users. The application translates user input into application data, which is sent to the remote application according to the rules of the application protocol. When the user selects the “login” button, our file transfer application prompts the user for the server name, username, and password. It then translates this application data into an FTP ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.