Not necessarily. Depending whether internal systems have been affected, say if their internal DNS went down along with these, many other things might be affecte

Not necessarily. Depending whether internal systems have been affected, say if their internal DNS went down along with these, many other things might be affected. Applications and appliances that have exponential backoffs might be minutes or hours away from a recovery without manual intervention; other things might be in a broken state for having given up e.g. mounting a network drive, etc. Failures, especially on such fundamental networking technologies like DNS and routing, and especially those that take a long time to resolve, have a tendency to cascade into catastrophic failues in many other systems.