The OSI Model
Layer 7
Application Layer #
Layer 2
Data Link Layer #
Network Layer
Establishes network connections; translates network addresses into their physical counterparts and determines routing.
Session Layer
Establishes, maintains, and terminates user connections.
Layer 3
Network Layer #
Layer 1
Physical Layer #
Layer 6
Presentation Layer #
Application Layer
Provides Interface between software applications and network
Layer 5
Session Layer #
Layer 4
Transport Layer #
Physical Layer
provides the means for transmitting data bits over a physical medium.
Data Link Layer
responsible for error-free transfer of data packets between nodes on the network.
Transport Layer
responsible for providing communication with the application by acknowledging and sequencing the packets to and from the application
Presentation Layer
responsible for translating data into a network compatible format.