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:
• An Introduction to the Types of VPNs
• Network Cabling and Components
• Unicast, Multicast, Broadcast. What Does It Mean?
• The TCP/IP protocol Datagram Format
• Network Switches
• TCP Windowing
• RADIUS Protocol
• X.25 and Frame Relay Overview
• IPv4 Datagram Fields
• Protocol Suites

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