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When there was given point that these series of switches (vlan capable) has serious security flaw, because switch management interface is listening across all untaged ports, no matter of its vlan ID...
This was essentially answered by bradleyv over there https://community.netgear.com/t5/Idea-Exchange-For-Business/configure-the-VLAN-management-interface/idi-p/1506483#M382 a few days before the request was posted.