单项选择题 Unfortunately，attackers have many options of attacks to perform against their targets. Which of the following is considered a denial-of-service （DoS）attack？（）

单项选择题 Some adversaries use DoS attacks as their primary weapon to harm targets，whereas othersmay use them as weapons of last resort when all other attempts to intrude on a target fail. Which of the following is most likely to detect DoS attacks？（）

单项选择题 Which of the following types of access control seeks to discover evidence of unwanted，unau-thorized，or illicit behavior or activity？（）