Lexert Labs pairs hands-on troubleshooting labs with exam-aligned study guides and timed practice tests. Diagnose genuine faults at a real terminal on Network+, Security+, and Linux+, work realistic scenario-based diagnostics on A+ and AI Workflows, then test yourself with timed practice exams for Network+, Security+, and A+.
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Connectivity is computed by walking the topology — masks, VLANs, ACLs, ARP, DNS and routing. The output reflects whatever is actually wrong. (Network+, Security+, and Linux+ use this live terminal model; A+ and AI Workflows use scenario-based diagnostic and code-analysis labs instead.)
No canned responses. Every command queries a real model, so faults show up exactly as they would in production.
ping, ipconfig, tracert, nslookup, arp, route print, and show commands — the tools you'd actually reach for.
Change the config, then verify. The lab only clears when connectivity is genuinely restored. You have to really find it.
A checklist tracks whether you're following a structured process — identify, gather, theorize, fix — without handing you the answer.
Stuck? Reveal escalating hints on your terms, right up to a full root-cause explanation.
Your results save per lab. Pick up where you left off and track completion across every track.
A realistic support ticket describes the symptom and what changed recently.
Run commands, read the topology, and scope exactly what works and what fails.
Form a theory and change the real configuration in the Fix panel.
Test it. Connectivity restored means solved — nothing else counts.
No subscription, no seats to manage. One purchase unlocks every lab — plus everything we add next.