1. A look back at the DDoS trends of 2018;Akamai InfoSec,2017
2. NETSCOUT Arbor’s 13th annual worldwide infrastructure security report;A. Network,2019
3. Azure DDoS protection—2021 Q1 and Q2 DDoS attack trends;Toh,2021
4. 2021: Volumetric DDoS attacks rising fast;Emmons,2021
5. Ddos attack trends for 2020;David Warbuton,2020