端口是信息進出任何系統的點。掃描端口以發現系統中的任何環形孔稱為端口掃描。系統中可能存在黑客攻擊和獲取關鍵信息的弱點。這些點應該被識別并防止任何濫用。常見的Port Scanning類型：

　　1、Strobe: Scanning of known services.

　　2、UDP: Scanning of open UDP ports

　　3、Vanilla: In this scanning the scanner attempts to connect to all 65,535 ports.

　　4、Sweep: The scanner connects to the same port on more than one machine.

　　5、Fragmented packets: The scanner sends packet fragments that get through simple packet filters in a firewall

　　6、Stealth scan: The scanner blocks the scanned computer from recording the port scan activities.

　　7、FTP bounce: The scanner goes through an FTP server in order to disguise the source of the scan.

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