De or het netwerkstoring?

The correct Dutch article is:

de netwerkstoring

Rule Words ending in -ing: almost always de. See the rule

How to use netwerkstoring

the netwerkstoringde netwerkstoring
this netwerkstoringdeze netwerkstoring
that netwerkstoringdie netwerkstoring
our netwerkstoringonze netwerkstoring
your netwerkstoringjouw netwerkstoring
every netwerkstoringelke netwerkstoring
which netwerkstoring?welke netwerkstoring?
a big netwerkstoring / the big netwerkstoringeen grote netwerkstoring, de grote netwerkstoring