Episode 25 — Interface configuration concepts: NetworkManager vs Netplan, what changes where
Linux+ includes interface configuration because different distros manage network settings differently, and mistakes often persist across reboot in ways that confuse troubleshooting. This episode introduces NetworkManager and Netplan as two common approaches to expressing network intent, applying it via underlying components, and maintaining persistent configuration. You’ll learn to read exam questions that hint at one system or the other through file paths, command phrasing, or distribution context, and to focus on the concept of “source of truth” rather than memorizing every configuration syntax. The core skill is understanding what changes where: which files define persistent state, which commands apply runtime changes, and how those choices affect troubleshooting when a system “works until reboot.”
we explore failure modes and best practices that keep networking predictable. You’ll practice reasoning through cases where manual edits conflict with a management tool, producing flip-flopping interfaces, missing routes, or DNS settings that revert unexpectedly. We also cover the importance of separating interface-level issues from higher-level problems: a clean IP configuration does not guarantee routing, DNS, or service reachability, but a broken interface configuration makes everything else irrelevant. Finally, you’ll learn a safe-change approach aligned with exam expectations: identify the manager in control, make one change using the correct mechanism, validate connectivity through the link→IP→route→DNS workflow, and ensure persistence by confirming the configuration is written to the right location for the platform. Produced by BareMetalCyber.com, where you’ll find more cyber audio courses, books, and information to strengthen your educational path. Also, if you want to stay up to date with the latest news, visit DailyCyber.News for a newsletter you can use, and a daily podcast you can commute with.
