introduction To DDOS attack (HD) - how to hack server

Introduction To DDOS attack video tutorial   OR distributed denial-of-service attack (explanation with demo) this attack is almost undetectable over the web so recent news "Google announced it had built "Project Shield" to help small websites stay online during DDoS (distributed denial of service) strikes" so we need to know what this ddos do and how it work u will learn all in this tut. for more visitn