Learn computer networking by doing.
Learn concepts, test your understanding, configure realistic virtual networks, and retain what you've learned with spaced repetition. Subnetica brings lessons, quizzes, hands-on labs, and guided learning paths into one loop.
No credit card required · Lessons, quizzes, and 3 full labs included
One learning loop, from first concept to lasting mastery.
These are connected steps, not separate tools. A lesson prepares you for a quiz, the quiz points you toward practice, and review brings the concept back later.
Interactive lessons
Build conceptual understanding before you configure anything.
Graded quizzes
Check whether you understand the idea, not just the vocabulary.
Hands-on labs
Apply it in realistic virtual networks with automatic grading.
Spaced repetition
Bring topics back at the right time so learning sticks.
Not sure where to start?
Follow a guided journey instead of picking isolated labs. Each path sequences the published lessons, quizzes, and practice activities.
Networking Fundamentals
BeginnerStart from nothing and finish able to read a routing table, segment a LAN with VLANs, run DHCP and DNS, and control traffic with NAT and access lists. Every concept is followed by a real network you configure yourself.
Network Services in Depth
IntermediateThe three services every network runs - addressing, naming and translation - past the point where the fundamentals stop. Scopes and options, records and caching, and publishing a service inward rather than just sharing an address outward.
Routing Protocols in Depth
AdvancedPast one static route and one OSPF adjacency, into the protocols as they actually behave - what they exchange, how they choose, and the specific ways each one fails while looking healthy.
Network Security and Access Control
IntermediateFiltering as it is actually practised - by service rather than by host, in the right direction, with state - and the controls around it that no device implements.
Motivation supports the learning.
Earn XP, level up, maintain a streak, and get review reminders as you work through the curriculum. Leaderboards and personal lab times are there when friendly competition helps you keep going.
Start free. Upgrade when you're hooked.
Every paid plan supports the complete learning loop: lessons, graded quizzes, spaced-repetition review, learning paths, XP, levels, streaks, and leaderboard participation. Choose a plan based on the lab access you need.
Learn networking from fundamentals to advanced troubleshooting.
51 lessons, 138 graded questions and 71 hands-on labs across 18 networking topics - each taught as a written lesson, checked with a quiz, practised in a real virtual network where the subject allows it, and kept fresh with spaced repetition.
- Networking Fundamentals
- IP Addressing
- Switching
- Routing
- Network Services
- Network Security
- Troubleshooting
- Design and Operations
- Automation
- Physical Networking
- 76.1% of Cisco Certified Network Associate exam weight represented
- 86.4% of CompTIA Network+ exam weight represented
Computed from the existing published-objective mappings, not asserted. Topic depth and hands-on lab availability are shown separately on the curriculum matrix. Wireless and physical-layer limitations are listed with reasons.
- Lessons · Learn
- Quizzes · Assess
- Labs · Practice
- Review · Retain
Repetition without memorization.
Built by a cloud engineer because networking is easier to learn by doing.
Subnetica was built around a simple idea: networking concepts make more sense when you can immediately configure, test, break, and troubleshoot them yourself.
subnetica© 2026 · Learn, practice, retain.