It is very useful and necessary to research the ports scan technology for cope with net inbreak effectively.

为了有效地对付网络入侵行为，对端口扫描进行研究是非常有益和必要的。

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Computer geeks call it war-driving or Net stumbling: roving around with a Wi-Fi-enabled laptop to scan for nearby Wi-Fi access points, then trying to see if they can use them for free.

FORBES: The Days Of Wi-Fi Scanning Are Numbered