As TPU points out, NVIDIA is finally getting rid of the D-Sub (VGA) support with the introduction of the GeForce GTX 1080. AMD stopped supporting D-Sub on its high-end cards in 2013, with the introduction of the Radeon R9 290 series.
The card's DVI connector does not have wiring for analog signals. Retail cards won't include DVI to D-Sub dongles, even aftermarket dongles won't work. What you get instead on the card, are one dual-link DVI-D, an HDMI 2.0b, and three DisplayPort 1.4 connectors.