Networking Fundamentals: An Introduction
The first topic in the Networking Fundamentals module lays the groundwork for understanding what a network is and how it functions in the digital world. It covers the origins of the Internet and the World Wide Web (WWW) before diving into the differences between private and public networks—key concepts that define how devices communicate.
Device Identifiers: IP and MAC Addresses
Once the basics are clear, we explore device identifiers, including:
- IP Addresses (IPv4 & IPv6): A numerical label that identifies a device on a network.
- MAC Addresses: A hardware-based, factory-assigned address unique to each device.
Interactive Lab: Hotel Wi-Fi & MAC Spoofing
A hands-on lab demonstrates MAC address spoofing using a hotel Wi-Fi simulation. In this scenario:
- Alice has paid for Wi-Fi, so her packets reach the TryHackMe website.
- Bob hasn’t paid, so the router blocks his packets.
- By changing Bob’s MAC address to match Alice’s, Bob bypasses the restriction and gains access.
This lab highlights how MAC spoofing can be used to manipulate network access—an important lesson in cybersecurity.
Introducing Ping: A Fundamental Network Tool
The module also introduces Ping, a simple yet powerful command used to test network connectivity. Ping works by sending ICMP (Internet Control Message Protocol) packets to a target device and measuring the response time. This helps determine:
✔ If a device or website is reachable.
✔ The latency or delay in communication.
Ping is an essential tool for troubleshooting network issues and is available on both Linux and Windows operating systems.
What’s Next?
Next, we’ll explore Local Area Networks (LANs)—how smaller networks operate within homes and businesses. Stay tuned! 🚀
