Denial-of-Service Attacks

Describe what is meant by a “Denial-of-Service” attack. Do you believe that denial-of-service attacks could realistically be used as part of a cyberterrorism or cyber warfare campaign? Is there any evidence of this technique being used successfully by nation-states as part of warfare?

Your initial post should be at least 250 words in length. Support your claims with examples from required material(s), and properly cite any references.