What is a switch?
Where every network starts — what a switch actually does, one frame at a time: MAC learning, flooding, and forwarding.
Video Library
Networking, explained.
Free lessons from our engineers — the same fundamentals we teach in full depth during our certification cohorts. No fluff, just how networks actually work.
What is a subnet?
IP addressing without the tears — how subnets carve up networks, and how to read a mask like an engineer.
Deep dive — VLANs, trunks & SVIs
Segmentation done properly: VLANs, trunk links, and switched virtual interfaces, from theory to configuration.
Spanning Tree Protocol
Why your network doesn't melt when someone creates a loop — root bridges, port roles, and how STP converges.
Port Channels
Bundling links for bandwidth and redundancy — EtherChannel, LACP, and the mistakes that keep port channels down.
Go deeper
Like the videos? The cohort goes further.
These are the fundamentals. In our 4–6 month certification cohorts, you configure all of it yourself — with an engineer at your side.
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