Lesson 7 - ICND1(1.5b) Describe the purpose and basic operation of the protocols in the OSI and TCP models

Session Layer 5
Maps to TCP/IP Model Application Layer 

Examples: NetBIOS, RPC

Communication using Sessions.
Definition from TCP/IP Guide:

"As its name suggests, it is the layer intended to provide functions for establishing and managing sessions between software processes. Session layer technologies are often implemented as sets of software tools called application program interfaces (APIs), which provide a consistent set of services that allow programmers to develop networking applications without needing to worry about lower-level details of transport, addressing and delivery."

Presentation Layer 6
Maps to TCP/IP Model Application Layer 

Examples: Encryption, Compression, Translation

Communication using Data Formatting.
Definition from TCP/IP Guide: 

"Protocols at this layer take care of manipulation tasks that transform data from one representation to another, such as translation, compression and encryption. In many cases, no such functions are required in a particular networking stack; if so, there may not be any protocol active at layer six."

Application Layer 7
Maps to TCP/IP Model Application Layer 

Examples:Telnet, FTP, HTTP

Communication using User Input.