The OSI Presentation Layer

By Stephen Bucaro

At the presentaion layer, layer six of the OSI model,source and destination applications communicate on a format for exchanging data. The sending computer may convert text to a generic format ( ASCII) for transmission over a network. The receiveing computer converts the ASCII to the format required by the destination application.

Data Transformation Services Provided by the Presentation Layer

• Text format conversions
• Binary and graphics format conversions
• Compression and expansion
• Encryption and decryption

When you think of the Application layer, keep in mind that the OSI is only a model. Actual network operating systems may handle the data conversion functions at the application and session layers.

More Networking Protocols and Standards:
• The OSI Physical Layer
• Comparing IPv4 and IPv6 at a Glance
• IPv4 to IPv6 Transition With the Dual-Stack Technique
• IPv4 Datagram Fields
• Classless IP Addressing
• T-Carrier
• OSI Network Model
• Network Gateways
• Neighbor Discovery Protocol (NDP)
• Video - Data Link Layer of OSI Networking Model

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