3.7. Upper Layer Communications
Once we get above the session layer, our communications become pretty specific to the program we're using. The responsibilities of the presentation and application layers are more a function of the type of service requested than the underlying protocol in use. Data translation and encryption are considered portable features.
NOTE
Portable means that these features can be applied easily to different services without regard for the underlying protocol. It does not matter if I'm using IP or IPX to transfer my data, the ability to leverage these features will depend on the application in use.
For example, Lotus has the ability to encrypt e-mail messages prior to transmission. This activity is performed at the presentation ...
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