Learning Objectives
- Understand basic network and router roles.
- Apply safer Wi-Fi settings (WPA2/WPA3, strong passphrases).
- Change default router credentials.
- Use guest networks and segmentation basics.
Module 5
Network and Wi-Fi Security
Protect local networks with stronger router setup, safer Wi-Fi choices and secure public-network behaviour.
Why This Matters
Your network is the pathway between devices and the internet. Weak network controls can expose everything connected to it.
Simple router hygiene provides a major security improvement.
Plain-Language Explanation
A router directs traffic and enforces some basic security boundaries. Wi-Fi security starts with modern encryption and strong credentials. Guest networks reduce risk by separating visitor devices from trusted systems. Public Wi-Fi should be treated as untrusted: avoid sensitive actions unless additional protections are in place.
Practical Examples
- Disable default router admin usernames/passwords and remote admin access unless needed.
- Separate IoT devices from work devices using a guest or segmented network.
- Use mobile hotspot or trusted VPN options on public Wi-Fi when handling sensitive data.
Common Mistakes
- Leaving factory-default router settings unchanged.
- Using weak Wi-Fi passwords shared widely.
- Trusting open public hotspots for account logins.
Security Checklist
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Short Knowledge Check
Question 1: Why is WPA3 preferred where available?
It offers stronger protections than older protocols and improves resistance to some attacks.
Question 2: What is the purpose of a guest network?
It isolates visitor or less-trusted devices from primary systems and data.
Question 3: Is public Wi-Fi inherently safe if it needs a password?
No. Shared networks still carry risk and should be treated cautiously.
Key Takeaways
- Router and Wi-Fi settings are foundational controls.
- Segmentation reduces lateral risk between devices.
- Public networks require extra caution.