Grind networking problems like it's LeetCode.
LeetNet is hands-on CCNA practice: 341+ Cisco IOS problems solved in a real in-browser terminal with live topology diagrams. An instant judge grades the resulting device state — any valid command order works — and teaching verdicts explain why a check failed, not just that it failed.
The built-in AI tutor sees your actual terminal history and coaches Socratically: it nudges you toward the answer, it never hands it over. Streaks, XP, job-title ranks, boss fights and earned terminal skins keep the habit alive.
Topics: VLANs, 802.1Q trunking, EtherChannel, Spanning Tree, port security, management access, IPv6, ACLs, router-on-a-stick, multi-switch campus networks, and fault-injection troubleshooting mysteries.
Free tier, no signup: ~138 problems, a daily challenge, and the AI tutor. Full access via the $49 Exam Passport (90 days) or Pro at $79/year.