Linux and Server IT · LNX-NET

Linux Networking

ip/ss/curl/dig, SSH keys, tunnels, firewall (ufw/nftables), DNS basics

What will be measured

Format: Hands-on: terminal tasks. No trivia — you do real tasks.
Domains: Connectivity · Ports and DNS · SSH · Firewall
Duration: about 20 minutes
Levels examinable: L1–L5
AI policy: AI-free
Scoring: Correctness first; efficiency (time, keystrokes, steps vs an expert reference) adds a bounded bonus. Graders check outcomes, so any valid approach passes.
Credential: Module badge, valid 24 months. $39 per certification attempt; practice is free.

Standard mode (L1–L3 on your public certificate): email verification, focus/tab detection, keystroke timing telemetry, randomized parameterized tasks, server-side timer.
Proctored mode (required for public L4–L5): government ID and selfie check, webcam snapshots and optional screen share, reviewed only if a session is flagged. Recordings are deleted after 90 days.
Unproctored results are capped at L3 on the public certificate; you can book a proctored retake to confirm L4 or L5. Every certificate shows whether it was proctored.
Retakes: wait 14 days per module, maximum 3 attempts per quarter. Your highest valid level shows on your profile.
We never show raw keystrokes or video to employers. You own your results. Data notice

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