This video is part of the cybersecurity series of presentations. This video presents a deep dive into the topic of Denial of Service (DoS) and Distributed Denial of Service (DDoS) attacks. The presentation provides a multithreaded C++ program (pc2lab.cec.miamioh.edu/docume...) that can be used to launch a DoS/DDoS attack. The presentation also covers some of the strategies that are used to combat DDoS attacks.