One interesting thing about NK is that they have their own walled garden intranet, only accessible from NK. https://en.wikipedia.org/wiki/Kwangmyong_(network)

Kwangmyong has been around since the latter half of the 90s, and is famously 'home grown' as a deliberate security feature.

NK also has some access to the regular internet, but it's very limited and tightly controlled. Meaning it is a luxury reserved for a few members of the upper echelons of NK society, or certain entrusted to people who need it for work (intelligence agencies and whatnot).