关键词：云计算网络；虚拟机；灾难恢复服务
摘 要：Some Infrastructure as a Service (IaaS) providers aren't willing to give Layer 4-7 services toenterprises that want to migrate applications requiring complex load balancing, applications,and firewalls from their private data centers into a public IaaS. Providers who do give Layer 4-7services take prudent, proactive steps to offer Platform as a Service (PaaS) developers a widerrange of IaaS delivery services (for example, disaster recovery service). Learn which deliveryservices the PaaS can use and what layers of multi-defense mechanisms should be consideredto better protect the IaaS from cloud abuse.