The OSI Model

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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.


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