DDoS attacks have always been more difficult to prevent than other forms of attacks. Perpetrators rarely face any form of punishment, and some judges have deemed the practice legal. Political action groups often meet in public forums, discuss targets, announce their plans to the press, then attack. Attackers have learned how to determine which elements comprise a victim’s most popular Web page, honing in on which ones take the most time to load and have the least redundancy. The most difficult challenge has been DDoS attackers’ increasing sophistication.”]
Source: https://www.csoonline.com/article/2618872/how-to-deny-ddos-attacks.html