ced4568andClaude Sonnet 5
e007bcf000
Adds all 6 ROOT 02 modules (Linux system administration, storage & filesystems, the Networking Mental Model, Linux network inspection, DNS & HTTP, Linux troubleshooting) — 37 activities, each with a real lesson, demonstration/guided exercise, knowledge check, hands-on Lab, and reflection. The Networking Mental Model module (M3) gets deliberately extra depth per its "critical module" designation, with no lab by design — conceptual mastery via knowledge check and guided exercise, matching root-05-m00's own precedent. Adds 6 new hands-on Linux/networking scenarios plus 2 MCQs: linux-service-inspection (inspects the platform's own real nginx without touching it — a genuinely safe, real service-inspection target that avoids ever risking the Lab's own connectivity), linux-service-lifecycle (start/ verify/stop a fully controllable service), linux-storage-inspection, linux-network-inspection (ip/ss/getent/curl, each framed as answering one specific diagnostic question), linux-dns-http-diagnosis (a genuine DNS-resolves-but-wrong-port failure, diagnosed and fixed), and linux-troubleshooting-framework (a real missing-config-file failure, resolved via the RootNode Observe/Evidence/Hypothesis/Test/Repair/Validate/Prevent framework). All tested end-to-end via the real scenario-validation API, including negative tests confirming they fail when unsolved. Wires rootnode-linux-networking-assessment (2 required + 4 random-draw scenarios) using the existing Phase 3B assessment engine. Co-Authored-By: Claude Sonnet 5 <[email protected]>
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Guided Exercise: Which Command Answers This Question?
This is a paper exercise — commit to an answer before checking it in the Lab.
Your task
For each question, name the ONE command you'd reach for first:
- "Does this machine have a working IP address at all?"
- "Is anything listening on port 8080 right now?"
- "Does
payments.internalresolve to an address?" - "Is the web server actually returning a valid response, not just accepting connections?"
- "Where does traffic to an address outside my local subnet actually go?"
A worked shape to check yourself against
ip -4 addr showss -lnt | grep 8080getent hosts payments.internalcurl -sf http://.../ -o /dev/null -w '%{http_code}'ip route
Instructor Notes
Facilitation: Have students justify WHY their chosen command answers the specific question asked, not just that it's "a networking command" — the goal is precision, not familiarity.
Approximate timing: 8-10 minutes live discussion; 5 minutes self-paced.