Module 13 · Final Unit
The Concept of Layers
In networking, layering means breaking the complex job of communication into smaller, separate tasks. You do not need to know the names of the layers—only why we use them.
1. Independence
One layer can be changed or upgraded (e.g. switching from Wi-Fi to Ethernet) without needing to change the Application (e.g. your Web Browser).
2. Specialisation
Developers can focus on one specific area of networking without needing to understand how all the other parts work.
3. Interoperability
Standard layers ensure that hardware from different brands (Apple, Samsung, Dell) can all work together seamlessly.
⚠ J277 Spec Check
You are not required to know the names or functions of each TCP/IP layer. Focus entirely on the benefits of breaking the network into layers.
USER-FACING SOFTWARE
DATA MANAGEMENT
ROUTING & ADDRESSING
PHYSICAL TRANSMISSION
"Think of layers like a relay race—each runner has a specific job, and they only need to worry about passing the baton to the next person."