Motivation behind this
Many a times, I thought of having a single glance of Security and Sharing architecture, but over the net I couldn't find it as a simple single flow. I am trying to portray this flow on best of my knowledge.
In the below flow, I am trying to showcase what the different layers of Platform Security and when a user tries on login to Salesforce what are the various steps come to play.
After successful login, if that user tries to access the record then how Object level, field level security comes into picture.
Obviously, in a private sharing model, data or record sharing is always in demand and how that can be achievable.
Finally, to showcase transport layer security, if the user wants to send data from Salesforce to external system how different steps occur is good to know.
The following picture might help those aspirants who are preparing for Admin, Sales Cloud and Integration Architecture certifications.