Presentation Layer Page
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What is the Presentation Layer?
- The presentation layer is concerned with the
representation (syntax) of the data in the messages associated with an
application during the transfer between two application processes. The aim
is to ensure that the messages exchanged between two application processes
have a common meaning
- known as shared semantics - to both processes. The presentation layer
is also concerned with data encryption and data security.
We deal with the following aspects of the presentation layer:
OSI Definition of Presentation Layer
and ISO Presentation Service
A quick run through the OSI Definition of the Presentation Layer, outlining
among other things the services provided by the presentation layer and the
functions of the presentation layer. The ISO Presentation Service is covered
ISO Presentation Protocol and Concepts
Presentation Layer Concepts and the ISO Presentation Layer.
There is no mention of
data encryption here because the actual presentation protocol is concerned
only with the syntax of messages during their transfer across the network.
Abstract Syntax and Transfer Syntax
Application exchanges involve transmitting data structures which may
be complicated. OSI introduced the notion of abstract syntax and
Included is a comparison between BER
(Basic Encoding Rules) and
Sun Microsystems' XDR (External Data Representation).
Data Encryption and Data Compression
Data Encryption is used to prevent listening or masquerading. In the context
of the OSI Reference Model, the most appropriate layer to perform such encryption
is the presentation layer. Data compression is done if required.
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