1. What is the Internet?
Introduction:
The internet is an integral part of our daily lives. From streaming videos to deploying applications in the cloud, everything relies on this vast network of networks. But what exactly is the internet?
Definition:
The internet is a global system of interconnected computer networks that communicate using a standardized set of rules called protocols. It enables the sharing of data and resources, connecting billions of devices worldwide.
The above diagram represents a submarine cable map refers to the global network of undersea fiber-optic cables used to provide international telecommunication services, including internet and data transfer. These cables form the backbone of global networking by connecting continents and countries.
What is a Network?
Introduction:
A network forms the foundation of the internet and is essential for connecting devices. But what does "network" actually mean, and why is it important?
Definition:
A network is a group of two or more devices (such as computers, servers, printers, or phones) that are connected to share data and resources. Networks can be as small as two computers or as vast as the internet itself.
Types of Networks:
Local Area Network (LAN):
A network within a small area, such as a home, office, or school.- Example: A Wi-Fi router connecting devices in your home.
Wide Area Network (WAN):
A network spanning large geographical areas, connecting multiple LANs.- Example: The internet is the largest WAN.
Metropolitan Area Network (MAN):
A network that covers a city or town, larger than a LAN but smaller than a WAN.- Example: Networks used by city authorities for traffic monitoring.
Personal Area Network (PAN):
A network centered around a single person, often using Bluetooth or USB.- Example: Your smartphone connecting to a smartwatch.
WAN >> MAN >> LAN >> PAN
Everyday Example:
When you connect your laptop to a Wi-Fi router, you're part of a network. The router lets your laptop communicate with other devices, like your phone, or access resources on the internet.