Advice Request [HELP] IOT vs guest Wi-Fi vs Ethernet: security concerns

Please provide comments and solutions that are helpful to the author of this topic.

Tiamati

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Hello! First of all, ty for your help. Let me explain my problem.

I'm currently using an old Philips smartTV, which the last update is from 2014. So I believe it probably has a lot of vulnerabilities issues.
According to some articles (here and here), all IOT should be connected to guest wifi, as they isolate those things from your home network. That's what I do. However, my old tv also can't connect to 5Ghz wi-fi what causes some performance problems. So, I considered changing it to an ethernet connection as I could easily connect the SmartTV to an ethernet cable.
However, IDK if I could isolate the TV from my network in the same way I do with the guest wifi. Do you have any idea?

Btw, my d-link router (EXO model) has a so-called Triple-Play option into VLAN section. Idk what exactly is that, but I wonder if it could help. (I'm posting a print of the function in case you wanna help me with that too)

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