Day 9 of learning cybersecurity
Cybersecurity beginner documenting my daily learning journey. Learning Linux, networking, and security fundamentals. Sharing notes, mistakes, and takeaways as I grow.
Today I started with computer networking and learned the basic fundamentals.
I began with an introduction to networking. Networking is the practice of connecting multiple devices so they can communicate and share data with each other.
Then I learned about types of networks:
PAN (Personal Area Network) – very small range, like Bluetooth connections
LAN (Local Area Network) – used in homes, offices, and colleges
MAN (Metropolitan Area Network) – covers a city or large area
WAN (Wide Area Network) – connects networks over large geographical distances, like the Internet
After that, I studied the OSI model. The OSI model explains how data moves from one device to another through different layers.
The OSI model has seven layers:
Physical
Data Link
Network
Transport
Session
Presentation
Application
Each layer has a specific role in data communication, which helps in understanding how networks work and how issues can be identified.
Why this matters for cybersecurity:
Most cyber attacks happen over networks. Understanding network types and the OSI model helps in analyzing network traffic, detecting attacks, and securing communication.
Next step: learning TCP/IP model, protocols, and deeper networking concepts.
