Network Security Basics

Summary

Applying security principles specifically to network design — segmenting sensitive systems, minimizing exposed surface area, and defaulting to deny rather than allow, building on Phase 3's networking fundamentals.

• 1Review a hypothetical network architecture and identify unnecessarily exposed services.
• 2Learn the concept of network segmentation and why it limits how far an attacker can move laterally.
• 3Practice applying a 'deny by default, allow explicitly' mindset to a security group configuration.