Networks, Wi-Fi, and firewalls

A network connects devices so they can share information. Knowing the basics helps you protect it.

Key ideas

• Every device on a network has an IP address.
• A router connects your network to the internet.
• A firewall allows or blocks traffic based on rules.
• A VPN creates an encrypted tunnel, which helps protect data on public Wi-Fi.
• Home and office Wi-Fi should use WPA2 or WPA3 security with a strong password.
• Change default passwords on routers, cameras, and smart devices.