OSI Reference Model

All networks are use in today are based on concept of Open System Interconnection (OSI) Reference Model developed in 1984 by ISO (International Organization of Standards). Instead, ISO decided to established a common reference model for which other could then develop detailed interfaces, which in turn could become standards.

CSMA/CD ” Carrier Sense Multple Access with Collision Domain “

CSMA/CD is a Media Access Control (MAC) protocol that defines how network devices respond when two devices attempt to use a same channel simultaneously and cause a data collision. It is a basic rule that prevent the lose of information and save bandwidth from collision on Ethernet Networks.

Types of Network Devices

Network devices are capable of control the signal, how they are going, where to going and how to maintain the transmission of signal. This are the roles each network devices may have in different way. Some devices may have the this feature or some may not. So lets check out all Network Devices with their purpose in this post.

• Repeaters
• Hub
• Bridges
• Switch
• Router
• Gateway
• Modem
• Firewall

Types of Communication Medium In Networks

There are several types of medium available on network industries, we will discuss all types in this post.

What is a Network?

A Network is a group of two or more computers or any other networking devices interconnected together via a communication medium to transmit and receive the data between each other.