Denial of Service (DoS)Created OnFebruary 21, 2018Last Updated OnFebruary 21, 2018Views10 You are here: KB Home Definitions Definitions D-E Denial of Service (DoS) < BackThe prevention of authorized access to resources or the delaying of time-critical operations. (Time-critical may be milliseconds or it may be hours, depending upon the service provided.) SOURCE: CNSSI-4009