回复：难到我吐血的题目，哪位好心肠能帮帮我呀

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SYN Floods: denial-of-service attacks in which the attacker uses spoofed IP addresses to send multiple connection (SYN) requests to the target. The target system then sends acknowledgements and waits for replies. Because the forged IP addresses don't belong to any actual machine, there is no reply, leaving connections open and blocking legitimate traffic.