OSI Model Flashcards
Physical Layer #
Layer 1
Physical Layer Purpose
Provides the electrical and mechanical connection to the network.
Data Link Layer #
Layer 2
Data Layer Purpose
Handles error recovery, flow control (synchronization), and sequencing.
Network Layer #
Layer 3
Network Layer Purpose
Accepts and transforms outgoing messages into packets, adding a header that includes routing information.
Transport Layer #
Layer 4
Transport Layer Purpose
Message integrity between source and destination.
Session Layer #
Layer 5
Session Layer Purpose
Provides the control functions necessary to establish, manage, and terminate the connections.
Presentation Layer #
Layer 6
Presentation Layer Purpose
Accepts and structures the messages for the application.
Application Layer #
Layer 7
Application Layer Purpose
Interacts with application programs that incorporate a communication component.
OSI Model Mnemonic
All People Seem To Need Data Processing
