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In this video, Jeremy Cioara covers VLANs. Having the same IP subnet is fine for a small network, but too many broadcasts can slow down the network and even the devices on it. VLANs solve that problem and can enable a "local" network across an entire campus.
IP subnetting is great for letting networked devices make quick requests to one another and have access to network resources, but too many devices means too many broadcasts - and then the entire network's going to start dragging. Security can also be an issue if you don't have fancy Layer 2 features protecting every device. Hence VLANs - they take a switch or entire network and break it up into multiples by creating broadcast separations as well as security boundaries by effectively "hiding" the devices on a network from one another. Here's a brief explanation of VLAN functionality - even how they use trunk - or tagged - ports to forward traffic to other switches.
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Start learning with CBT Nuggets:
• Intro to Networking | courses.cbt.gg/tuv
• Building a Network Design | courses.cbt.gg/0g9
• Real-World VLAN Design and Implementation | courses.cbt.gg/b8z
• Real-World Cabling and Devices | courses.cbt.gg/tlf
• Building a Business Switched Network | courses.cbt.gg/ho3