What are the challenges in mitigating volumetric DDoS attacks?

Mitigation challenges include the sheer volume of traffic generated, which can overwhelm even the most robust defenses. Attackers constantly evolve their techniques, requiring continuous updates to mitigation strategies. Differentiating legitimate traffic from malicious traffic in the midst of a large volume of packets is difficult. The dynamic nature of botnets makes it challenging to block all malicious sources. Cost of mitigation can also be a significant factor.