I am designing the web application which will be used by network engineers. This application will help them to know the statistics of their network.
I would like to know which is the minimum resolution to be considered while designing the same?
1280 is widely preferred resolution but 1366 is recently topping the chart.
More here: http://www.screenresolution.org/year-2016/
The simplest solution would be to contact some network engineers and find out what screen sizes they are using. I imagine you'll get a wide range of answers but that a few of them will be more popular than others. Weed out the extremes and you should be able to use these results to find the (sensible) minimum screen size.