Internet
What is the Internet?
The Internet is a worldwide network of interconnected computers and devices that communicate with each other using standardized protocols, primarily TCP/IP (Transmission Control Protocol/Internet Protocol).
Simple Definition
The Internet is often called a "network of networks" because it connects millions of smaller networks around the world.
Real-World Example
When you visit a website:
Your computer sends a request over the Internet.
The request travels through routers and networks.
A web server receives the request.
The server sends the webpage back.
Your browser displays the page.
How the Internet Works
Plain Text
Laptop/Phone
|
v
Router
|
v
Internet Service Provider (ISP)
|
v
Internet
|
v
Web Server
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Key Components of the Internet
1. Devices
Computers
Smartphones
Tablets
Servers
2. Routers
Direct data packets between networks.
3. ISPs (Internet Service Providers)
Companies that provide Internet access.
Examples:
Comcast
AT&T
Verizon
4. Servers
Store websites, applications, and data.
5. DNS (Domain Name System)
Translates domain names into IP addresses.
Example:
Plain Text
www.microsoft.com
↓
20.112.x.x
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Internet vs. Web
Many people think they are the same, but they are different:
Internet World Wide Web (WWW)Global network infrastructure Service that runs on the Internet
Connects devices worldwide Displays websites and web pages
Includes email, VoIP, gaming, cloud services Includes web browsers and websites
Think of it this way:
Internet = The roads and highways
Web = The cars driving on those roads
Common Internet Services
Web browsing
Email
Cloud storage
Video streaming
Social media
Online gaming
Video conferencing
Cybersecurity Perspective
The Internet introduces risks such as:
Phishing attacks
Malware
Data breaches
Denial-of-Service attacks
Identity theft
To protect users, organizations use:
Firewalls
Encryption
Antivirus software
Multi-Factor Authentication (MFA)
Intrusion Detection Systems (IDS)
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