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Presentation Layer

The presentation layer (data representation layer, data provision layer) converts the system-dependent representation of the data (for example ASCII, EBCDIC) into an independent form and thus enables syntactically correct data exchange between different systems.

Tasks such as data compression and encryption are also part of the presentation layer. The presentation layer ensures that data sent from the application layer of one system can be read by the application layer of another system. If necessary, the presentation layer acts as a translator between different data formats, using a data format understandable to both systems, the ASN.1 (Abstract Syntax Notation One).

Protocols and standards: ISO 8822 / X.216 (Presentation Service), ISO 8823 / X.226 (Connection-Oriented Presentation Protocol), ISO 9576 (Connectionless Presentation Protocol)