Think of vLAN's like playing cards, where you can only play cards of the same suit. In the vLAN world, ports can only see network traffic of the same (or allowed) vLAN's. If you have multiple suits of cards in your hand, then you have access to play any of those suits. If a network port is set to allow access from multiple vLAN's, then it can see traffic from each of those specific vLAN's.
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