What is the role of SYN flooding in a DoS/DDoS attack?

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Grade: Education Subject: Ddos
What is the role of SYN flooding in a DoS/DDoS attack?
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SYN flooding exploits the TCP handshake process. The attacker sends numerous SYN (synchronize) requests to the target server but never completes the handshake (doesn't send the ACK). This leaves the server waiting for responses, exhausting its resources and preventing legitimate connections.