Looking back at 2021, DDoS threats showed absolutely no signs of abating as adversaries continued to launch a broad array of attacks against organizations. DDoS activities continued to surge throughout 2021, with total attack traffic hitting record high. Attack scale and magnitude both saw dramatic increase, while attack methods have become vastly more sophisticated. The number of Tbps-scale attacks rose significantly as compared with 2020. More multi-vector attacks were observed, among which a