First Internals...

Chapters included for internals...

2. Layered Architecture and Applications
5. Local Area Networks (LAN)
6. Minimum Access Control (MAC)

:- Chapters in reference to Skyward Publications.

Introduction

Pre-Col breifing :

 Elements of Data communication: 
1. A sender ( source ) who creates the message to be transmitted.
2. A medium that carries the message.
3. A receiver ( sink ) who receives the message

Few Terms you should know :
Data : A collection of facts in raw form.
Signals : Electric or electromagnetic conversion of data.
Signaling : Propagation of signals across a communication medium.
Transmission : Communication of data achieved by processing received signals.