To explain how a denial-of-service attack works, this interactive lesson first describes the "three-way handshake," the process of creating a connection between computers communicating using the transmission control protocol (TCP). Denial-of-service (DoS) and distributed denial-of-service (DDoS) attacks overwhelm a receiving computer system with incomplete three-way handshake sessions.

This interactive lesson was made possible by funding from National Science Foundation Grant # DUE 1601612 at Brookdale Community College in Lincroft, New Jersey – PI Mike Qaissaunee, with contributions from Dr. John Sands & Susan Sands of Moraine Valley Community College and Jaime Mahoney of Bunker Hill Community College.

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