02 / Networking

Seven layers.
One connected system.

The OSI model is a networking reference model that helps explain how data moves from hardware and signals up to the applications people use.

7
ApplicationUser-facing network services and applications.
6
PresentationFormatting, encryption, encoding, and translation.
5
SessionStarts, maintains, and ends communication sessions.
4
TransportTCP/UDP, segmentation, delivery, and reliability.
3
NetworkIP addressing, routing, and path selection.
2
Data LinkFrames, switching, and MAC addressing.
1
PhysicalCables, ports, signals, and hardware connections.
Why “77”? Seven OSI layers are part of the brand identity. The number is a visual reminder that good troubleshooting often means understanding where in the stack a problem is happening.