North Korea's internet is having serious problems21
If the outage is in fact the result of a US attack, it would represent a wholesale attack on a country's access to the internet, setting a dangerous precedent of retaliation against targeted attacks. Access to the web in North Korea is generally restricted to military or government uses, so the downtime would have no effect on the average citizen, but the precedent could be used to justify far more destructive denial-of-service attacks. Still, it's just as plausible that the downtime is the result of internal North Korean operations or simple infrastructure problems. Until more evidence surfaces, it's difficult to say for sure.