https://www.youtube.com/watch?v=7_LPdttKXPc

https://www.youtube.com/watch?v=vrxwXXytEuI&t=34s

DOMAIN 2 — NETWORK INFRASTRUCTURE

1. What Is a Network?

A group of devices connected so they can share information.

Types include:

• LAN (Local Area Network) — your home or school network
• WAN (Wide Area Network) — large networks like the internet
• Internet — a network of networks

2. How Data Travels: Packets

When you send something, it’s broken into tiny chunks called packets.

Each packet has:

• a destination IP address
• a source IP address
• data
• error-checking information

Packets may take different routes but arrive in order.