SANS Exam SEC504 Topic 7 Question 29 Discussion

Peter works as a Network Administrator for the PassGuide Inc. The company has a Windows-based network. All client computers run the Windows XP operating system. The employees of the company complain that suddenly all of the client computers have started working slowly. Peter finds that a malicious hacker is attempting to slow down the computers by flooding the network with a large number of requests. Which of the following attacks is being implemented by the malicious hacker?