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Security & Networking Foundations
50 minbeginner

Design Subnets, Firewall Rules and DMZ

This exercise designs NimbusDesk's network segmentation from Module 2's subnetting and firewall concepts: separating the public web tier into a DMZ, isolating the internal admin panel, and placing the database in the most restricted segment with the narrowest possible set of firewall rules permitting only the traffic each tier genuinely needs.

Analogy🏏Cricket
💪 Think of it like fitness: injuries follow a predictable chain — poor warm-up, then form breakdown, then compensation, then the actual tear — and a good physio catalogs where each patient's chain can be interrupted early, rather than only treating the tear afterward. MITRE ATT&CK is the sports-medicine literature of intrusions: a public catalog of every observed breakdown pattern, organized by the stage it serves — how attackers get in, how they escalate, how they extract. Coaches worldwide describe an athlete's risk in that shared vocabulary. This reveals ATT&CK's real value: intrusions become a sequence you can interrupt at stage two, not a disaster you discover at stage five.
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