Arif ... To add to what Josh has already said just be sure to verify that your scale is appropriate for the situation.
If you're simply sending off a drawing to someone in a requested format then it may not matter but we do a lot of Wire-EDM and Water-Jet/Laser Cutting and need to ensure the databases we send off are at a true 1:1.
When this situation arises we will typically create a "drawing" on a blank sheet format with any/all drawing views required for the work at hand and save that file off as our DXF.
I'm unsure if anything has changed as I've followed the same routine for some time now (years upon years) but I would add that I do not change the scale of any drawing views in my blank sheet that I save out. I have found that changing the views in any way (even changing them to 1:1) results in the drawing view not getting properly exported at the scale that I need. I know this sounds a counter intuitive but it has always been the case when using the Scale Output 1:1 option.
No problem.
Warning only.
SolidWorks drawing has several scales (sheet scale, view scale, etc)
DXF can have only one scale.
Therefore, DXF view may be different scales.