Complex sentence: IP spoofing is most frequently used in denial-of-service attacks where the goal is to flood the victim with an overwhelming volume of traffic, and the attacker does not care about receiving responses to the attack packets.
Split into simpler sentences: IP spoofing is most frequently used in denial-of-service attack attacks. In such attacks, the goal is to flood the victim with overwhelming volume of traffic, and the attacker does not care about receiving responses to the attack packets.