Comprehensive Explanation from CEH v13 Courseware:

CEH v13 underscores that modern multi-vector DDoS attacks—particularly SYN floods combined with Layer 7 HTTP floods—cannot be effectively mitigated by traditional firewalls, IPS devices, or local traffic filters. These systems become overwhelmed or risk blocking legitimate clients. CEH emphasizes the use of cloud-based DDoS mitigation platforms that provide traffic scrubbing, distributed filtering, rate shaping, and automatic scaling to absorb massive volumes of malicious traffic. Such services differentiate legitimate versus malicious traffic using global intelligence, behavioral analysis, and multi-layer protection strategies. Increasing bandwidth or blocking broad traffic categories is ineffective and harmful to users. An IPS cannot scale to handle volumetric attacks. Only cloud scrubbing solutions (e.g., Cloudflare, Akamai, AWS Shield Advanced) meet CEH’s recommended defenses for high-volume distributed attacks. These services ensure continuous availability and minimize collateral damage by filtering traffic upstream before it reaches the organization's infrastructure.