2.1. Linux Foundations: Architectures, Distributions, and Licensing

The exam expects you to recognize which tools and behaviors differ across distribution families and architectures. A playbook that works perfectly on Ubuntu will fail on RHEL for one predictable reason: package management. A container image built for x86_64 won't run on an AArch64 server without emulation. Understanding distribution families and architectures lets you predict these failure modes before they happen in production.

💡 First Principle: Linux's power comes not from any single distribution but from the ecosystem of tools and conventions shared across all of them. Distribution families differ in their tooling and default configurations, but the kernel, FHS, and shell utilities are universal.

⚠️ Common Misconception: Candidates often assume RPM-based and Debian-based systems are equivalent for all administrative tasks. The package managers, service defaults, SELinux vs. AppArmor defaults, and firewall tooling all differ between families.