A denial-of-service attack is an attack in which a user (or a program) takes up so much of a shared resource that none of the resource is left for other users or uses. Although the mainframe computers of yesteryear had some defenses against denial-of-service attacks, modern computer systems are notoriously poor at handling such attacks.
Should we be concerned about denial-of-service attacks? Dennis Ritchie, one of the original creators of the UNIX operating system, didn’t think so back in the 1970s when UNIX was first designed. When Simson interviewed Ritchie in 1988, Ritchie said that UNIX wasn’t built to withstand denial-of-service attacks because most of these attacks were either launched “by accident, or it was relatively ...