111 - Domain 4 - 41OSI Model and its layers

The Certified Information Systems Security Professional (CISSP) certification is a globally recognized credential that demonstrates an IT security professional's knowledge and skills:
What it validates
The CISSP certification validates a professional's ability to design, engineer, and manage an organization's security posture. It demonstrates their technical and managerial skills, as well as their hands-on experience.
Who it's for
The CISSP certification is intended for professionals with experience in information security. It's highly sought after by IT professionals.