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Open Systems Interconnection Reference Model (OSI Model)

The OSI Model


Physical (layer 1)


Describes the mechanical and electrical details of network components such as cable, connectors and network interfaces


Data Link (layer 2)


Describes the basic techniques that networks use to uniquely identify devices on the network (typically via a MAC address) and the other means for one device to send information over the physical layer to another device, in form of data packets. Switches operate at the data link layer, which means they manage the efficient transmission of data packets from one device to another


Network (layer 3)


Handles the routing of data across networks. Routers operate at the network layer


Transport (layer 4)


Provides for reliable delivery of packets


Session (layer 5)


Establishes sessions between network applications


Presentation (layer 6)


Converts data so that systems that use different data formats can exchange information


Application (layer 7)


Allows applications to request network services
[Image: NUjQVJN.gif]
Your order seems like a de-encapsulation of a packet itself?
I am quite used to looking at the encapsulation diagram instead lol.

Which is starting from Layer 7 all the way down to layer 1.
[Image: j90qyxk.gif]


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