端口扫描攻击。
A port scanning attack is performed through the structured and systematic scanning of a host.
端口扫描攻击通过对主机进行系统的结构化扫描来实现。
IaaS providers may not allow network-based vulnerability scanning because they have no way of distinguishing friendly network scans from attack activity.
IaaS提供商可能不允许基于网络的漏洞扫描，因为他们无法区分善意的网络扫描和攻击活动。
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