Data communications refers to the transmission of this digital data between two or more computers and a computer network or data network is a telecommunications network that allows computers to exchange data. The physical connection between networked computing devices is established using either cable media or wireless media. The best-known computer network is the Internet.

This tutorial should teach you basics of Data Communication and Computer Network (DCN) and will also take you through various advance concepts related to Data Communication and Computer Network.
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This guide consists of following chapters

DCN Overview
DCN - Computer Network Types
DCN - Network LAN Technologies
DCN - Computer Network Topologies
DCN - Computer Network Models
DCN - Computer Network Security

Physical Layer
DCN - Physical Layer Introduction
DCN - Digital Transmission
DCN - Analog Transmission
DCN - Transmission media
DCN - Wireless Transmission
DCN - Multiplexing
DCN - Network Switching

Data Link Layer
DCN - Data Link Layer Introduction
DCN - Error detection and Correction
DCN - Data Link Control & Protocols

Network Layer
DCN - Network Layer Introduction
DCN - Network Addressing
DCN - Routing
DCN - Internetworking
DCN - Network Layer Protocols

Transport Layer
DCN - Transport Layer Introduction
DCN - Transmission Control Protocol
DCN - User Datagram Protocol

Application Layer
DCN - Application Layer Introduction
DCN - Client-Server Model
DCN - Application Protocols
DCN - Network Services