How do simple DDoS attacks differ from more advanced or complex DDoS attacks?

Simple DDoS attacks primarily rely on volume and basic attack vectors (e.g., SYN, UDP floods) to overwhelm network or transport layers. They often use unsophisticated botnets and readily available tools. In contrast, complex DDoS attacks are multi-vector, targeting multiple layers (network, transport, application simultaneously), often employing sophisticated evasion techniques, reflective/amplification methods, and dynamic attack patterns to bypass standard defenses, requiring more advanced mitigation strategies.