A denial of service attack (DoS) attack is achieved by . Question 19 options: a) submitting huge numbers of access requests simultaneously to overload a particular site's web server b) displaying advertisements to a user so that they cannot continue normal online activities c) making copies of a virus, then sending infected emails to others without the user's permission d) deleting all of the files from a particular site's web server

Solution: the categorization of functional and non-functional requirement are as follows: some of the more typical functional requirements include: • business rules• transaction corrections, adjustments and cancellations• administrative functions• authentication• authorization levels• audit tracking• external interfaces• certification requirements• reporting requirements• historical data• legal or regulatory requirementswhile,some typical non-functional requirements are: • performance – for example response time, throughput, utilization, static volumetric• scalability• capacity• availability• reliability• recoverability• maintainability• serviceability• security• regulatory• manageability• environmental• data integrity• usability• interoperability