Chapter 2: The OSI Model and TCP/IP Model

By Ravindra Bagale · Last updated: 25 September 2026

Mitranno, let's first understand why we even need a layered model. When something breaks in production, a good engineer does not panic — he or she checks layer by layer. This chapter gives you that thinking pattern. Ekdum simple aahe, just stay with me.

Concepts in this chapter

1. 2.1Why do we need a reference model?
2. 2.2The seven layers
3. 2.3The TCP/IP model and comparison
4. 2.4Walk-through: what happens when you open a website?

Review and practice

1. ★Common Mistakes I See Students Make
2. ★Interview Questions
3. ★Practice Questions and Lab Exercises