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Presentation Layer
The presentation layer protocols are part of the user’s operating system and applications. In this layer information is formatted for display or printing. Tasks like interpretation of codes within the data (such as tabs or special graphics sequences), data compression, decompression, encryption and the translation of other character sets are performed here.
Session Layer
Session layer sets up manages, and then tears the sessions between Presentation layer entities. This layer coordinates communication between nodes, and offers three different modes of communications: Simplex, Half Duplex and Full Duplex.
Transport Layer
This layer breaks and reassembles the large data into data stream. It provides a high level of control for moving the information between systems, including prioritization, more sophisticated error handling, and security features. It controls packet sequence, regulates traffic, and finds duplicate packets. If data is missing from the packet, the receiving end transport layer protocol asks the sending end transport layer protocol to retransmit packets. This layer ensures that all data is in the proper order and received completely.
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