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7-Layer OSI Model

LayerFunction
Layer 7 Application
Layer 7 provides network services to application processes (such as e-mail, file transfer & terminal emulation)
Layer 7 the interface that allows the application (program) to communicate
Layer 6 Presentation
Layer 6 Like an interpreter
Layer 6 Data representation
Layer 6 ensure that data is readable by the receiving system
Layer 6 format of data
Layer 6 data structures
Layer 6 negotiates data transfer syntax for application layer
Layer 5 Session
Layer 5 interhost communication
Layer 5 establishes, manages, and terminates sessions between application
Layer 4 Transport
Layer 4 end-to-end connection reliability
Layer 4 ensures integrity of data
Layer 4 concerned with data transport issues between hosts
Layer 4 data transport reliability
Layer 4 establish, maintain, terminate virtual circuits
Layer 4 fault detection and recovery
Layer 4 information flow control
Layer 4 TCP: Transmission Control Protocol
Layer 3 Network
Layer 3 Addresses & best path
Layer 3 provides connectivity and path selection between two end systems
Layer 3 domain of routing
Layer 3 IP: Internet Protocol
Layer 3 Logical Addresses
Layer 2 Data Link
Layer 2 Access to media
Layer 2 provides reliable transfer of data across media
Layer 2 physical address, network topology, error notification, flow control
Layer 2 physical address: MAC address (Media Access Control)
Layers 2 & 3 only layers concerned with addressing
Layer 2 Protocol: Ethernet
Layer 2 Protocol: Frame Relay
Layer 1 Physical
Layer 1 binary transmission
Layer 1 wires, connectors, voltages, data rates
Created by: lynzl84