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SYN Flood

SYN Flood

A type of denial-of-service attack. During the establishment of a TCP session, a 3-way handshake takes place, commencing with a SYN packet sent to the server that requests the connection. This should be followed with a SYN-ACK packet returned from the server and finally an ACK packet from the client. If the client fails to respond with the final ACK, a half-open connection results. These half-open connections consume resources on the server without the corresponding ACK, an attacker can effectively prevent any further connections resulting in the denial of service

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