1. Chapter 3. Denial of service (DoS) attacks can cripple an organization that relies heavily on its Web application  servers, such as online retailers. What are some of the most widely publicized DoS attacks that have recently occurred?  List when, what entity was attacked.2. Chapter 4 . Select an attack, such as “Break into Instructor’s Lab Computer” or “Steal Credit Card Number From Online User,” and then develop an attack tree for it. The tree should have at least four levels with three boxes on each level.3. Per the syllabus, bring in a current event article of a cyber security event. 1 page