Virtually all networks in use today are based in some fashion on the Open Systems Interconnection (OSI) standard. OSI was developed in 1984 by the International Organization for Standardization (ISO), a global federation of national standards organizations representing approximately 130 countries. The core of this standard is the OSI Reference Model, a set of seven layers that define the different stages that data must go through to travel from one device to another over a network.
OSI images without descriptions:
Internet and OSI - Google Drive
The 7 layers of the OSI Protocol Stack are, in descending order, as follows:
Supports end user services
Handles data encryption and data compression
Provides authentication and authorization
Guarantees end-to-end delivery of packets
Packet routing
Transmits and receives packets
Physical connection or cable
OSI images with descriptions: