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Even with the certifications set to change, it will still be critical to understand VLANs; How they work, and how they're configured.
They're a simple concept, but when you're new, they're so foreign. No one truly understands VLANs the first time. When I first hear about them (many years ago now) I couldn't even understand why we'd need them. It took a while to sink in.
Here's a video that begins to take you through this. It is my hope that it will make it easier to learn VLANs for anyone new to networking.