Today I updated to macOS Sierra. Until now I disabled WLAN, because my Mac is connected via Ethernet (cable). However, Siri needs WLAN to determine where I am. Thus without WLAN, Siri cannot answer my questions e.g. about the weather. So I enabled it again.
Now my Mac is also connected via WLAN. Does this mean, net traffic now goes over the air though the Mac is connected via Ethernet? (I wouldn’t like that.)