From here. Under Windows 7 all DNS requests were made in simple order of DNS server preference, but this changed in Windows 8 when Microsoft added “‘Smart Multi-Homed Name Resolution” by default. This sent out DNS requests to all available interfaces, but only used non-preferred servers if the main DNS server failed to respond.

This makes Windows 8.x systems liable to DNS leaks, but at least makes it unlikely that DNS requests will be hijacked.

Windows 10, on the other hand, simply chooses whichever DNS request responds quickest, which presents a major security risk.

From here Windows 8 and 8.1 could use registry to disable SMNR. Windows 10 needs Group Policy set (not registry)

Show all SSID profiles used

netsh wlan show profiles

Show connected SSID profile

netsh wlan show interfaces