File:OSI user layers.png - Wikimedia Commons

Maslow and the OSI Model – ozonefarm

A Comprehensive Guide to the OSI Model

Common ISO/OSI network model layers and HIP network model layers.

Cloud security best practices: part 3 Network Layers 4–7, by Cohesive Networks

Understand Server Sandbox

File:OSI-model-Communication.svg - Wikipedia

7 Layers of The OSI Model (A Complete Guide)

File:TLS in OSI.png - Wikimedia Commons

a) SDR role in OSI layers, (b) SDR properties.