What is a TCP port scan?

A common Transmission Control Protocol (TCP) port scan sends a TCP SYN (synchronize) packet to a specific port of a server as part of the TCP three-way handshake. If the server responds with a SYN/ACK (synchronize/acknowledge) packet, the scanner knows the port is open. However, instead of completing the three-way handshake, the scanner can send […]

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What is a SYN Flood attack?

A SYN flood attack disrupts the TCP initiation process by withholding the third packet of the TCP three-way handshake. Flood guards protect against SYN flood attacks.

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