Each lesson is a self-contained lab. Read the explanation, then jump straight into the NetForge-AI canvas with the topology pre-loaded.
Looking for the full networking curriculum? Browse the course →From /24 to /30: how prefix length carves up an IP space, why /30 is perfect for point-to-point links, and the math you must memorize for the exam.
Start lessonWatch a switch build its MAC address table from scratch. Understand exactly when a frame floods vs forwards, and why hubs were retired.
Start lessonSegment a single physical switch into independent broadcast domains. Configure access VLANs, set up an 802.1Q trunk, and prove isolation with ping.
Start lessonWhy the network address matters more than the host address. Build a 3-router topology and write the static routes that make every PC reachable.
Start lessonLayer 3 plans the trip; Layer 2 actually delivers. Trace the ARP request/reply that resolves every first conversation between hosts.
Start lesson