黑客进入虚拟机之后，他可以使用黑客工具启动恶意的网络扫描攻击活动，并把这些活动伪装成善意的网络扫描。
Once he is inside a virtual machine, he can use a hacker's tool to launch malicious network scanning attack activity in the guise of friendly network scans.
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。
IaaS providers may not allow network-based vulnerability scanning because they have no way of distinguishing friendly network scans from attack activity.
此外，标准的技术，如基于网络的漏洞扫描通常被IaaS提供商所禁止，原因之一是无法把友好的扫描从攻击者的活动区别开来。
Also, standard tech-niques such as network-based vulnerability scanning are usually forbidden by IaaS providers because, for example, friendly scans can't be distinguished from at-tacker activity.
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