VLAN, Guest Network etc

Hi all

This may be a stupid question but I am going to ask it anyway…

I see many posts and have read loads about VLAN’s etc and completely understand the need to isolate iOT devices from my main network, for example at the moment I have all devices on the same network. I have some cheap broadlink devices that work locally, so I have simply blocked them from internet access within my router.

My question is does this basically negate the need to put them on a VLAN and or separate guest network for example, as assuming they have no internet access they are secure or am I missing some key facts here?

Thanks for your input

submitted by /u/PicoTrain2
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Original article: VLAN, Guest Network etc
Author: /u/PicoTrain2