Questions about Value Mini DisplayPort — DisplayPort

Yes, but only via docking station with Mini DP.

Yes, it should work, Thunderbolt 1 & 2 ports are fully compatible with Mini Displayport. Whether the Macbook Air can drive all the pixels of a 4K display is another question, you may have to expect reduced resolution.

ja

According to the Manufacturer, this cable is DP v1.1. -> https://www.secomp.de/de_DE/value-displayport-kabel-dp-st-mini-dp-st-3-0-m/i/11995636 Then again i read this: Despite what you may read, there is no such thing as a DisplayPort 1.1 cable and DisplayPort 1.2 cable. A standard DisplayPort cable, including the so-call DisplayPort 1.1 cables, will work for any DisplayPort configuration including the new capabilities enabled by DisplayPort 1.2, including 4K and multi-stream capabilities. All standard DisplayPort cables support RBR, HBR (High Bit Rate), and HBR2 (High Bit Rate 2), which can support 4K at 60Hz, or up to four 1080p displays using multi-stream. -> https://www.displayport.org/cables/how-to-choose-a-displayport-cable-and-not-get-a-bad-one/