A:AnswerNO IT IS NOT GIGABIT!!
I just spent a good bit of time confirming this. Our UN55NU7100FXZA only negotiates an Ethernet link at 100Mbps, even when using STP Ethernet cables as the manuals suggest. It will hit a solid 90Mbps+ though on the Ethernet port.
A:AnswerThey do not. You will need 4 screws, each is M8 × 45 mm in length. Some reviews say you may need longer screws, depending on the thickness of your mount bracket. I am now stuck as I do not have these screws.