Chapter 2
The Open Systems Interconnection Specifications
THE FOLLOWING COMPTIA NETWORK+ EXAM OBJECTIVES ARE COVERED IN THIS CHAPTER:
✓ 1.2 Explain devices, applications, protocols, and services at their appropriate OSI layers
- Layer 1 – Physical
- Layer 2 – Data link
- Layer 3 – Network
- Layer 4 – Transport
- Layer 5 – Session
- Layer 6 – Presentation
- Layer 7 – Application
In this chapter, we’re going to analyze the Open Systems Interconnection (OSI) model. I’ll thoroughly describe each part to you in detail because it’s imperative for you to grasp the OSI model’s key concepts. Once solidly equipped with this vital foundation, you’ll be set to move on and build your own personal storehouse of networking knowledge.
The OSI model has seven hierarchical layers that were developed to enable different networks to communicate reliably between disparate systems.
Because this book is centering upon all things...
