Network Software and Layered Concepts

Why Layering in Networks?

• Networking is complex (software, firmware, hardware, signals).
• To simplify → networking is divided into layers, where each layer performs a specific function.
• Layers are independent but work together by exchanging input/output.

Layered Tasks

• A networking process is broken into smaller tasks.
• Each layer handles only its task and communicates with its peer layer on the other machine.
• Data is passed downward (from application to physical) at sender and upward at receiver.
• Each layer uses encapsulation (adding headers/trailers) to identify its peer.

Why Layered Architecture?

1. Easier design & development (divide-and-conquer).
2. Modularity → components can be replaced independently.
3. Clear interfaces → better vendor compatibility.
4. Layer independence → change possible without affecting others.
5. Easier troubleshooting & testing.

Protocol Stack