Layer 1: Physical Layer
Defines the electrical and physical specifications for devices
Layer 2: Data Link Layer
Provides the functional and procedural means for transfer of data, and also to detect/ correct errors in the physical layerExample: Ethernet
Layer 3: Network
Provides the means for transferring variable length data sequences from a source to a destination through one or more networks.Example: Internet Protocol (IP)
LayerLayer 4: Transport
Provides transparent transfer of data between end users, and is responsible for reliability of data transfer.Example: Transport Control Protocol (TCP)
LayerLayer 5: Session
Establishes, manages and terminates sessions (or connections) between local and remote applications.
LayerLayer 6: Presentation
Transforms data to provide a standard interface for the Application Layer.Examples: MIME encoding, converting ASCII to EBCDIC or vice versa
LayerLayer 7: Application Layer
Enables users to access information through an applicationExamples: Telnet, applications using HTTP/FTP/SMTP etc.