A company hosts part of their network infrastructure in the cloud. The company is able to move workloads and servers between their on-premise private network and their network in the cloud. What type of cloud service is this referring to?

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This describes Infrastructure as a Service. In IaaS, the cloud provider delivers virtualized computing resources such as servers, storage, and networking, while you maintain control over the operating system, middleware, and applications. Being able to move workloads and servers between the on‑premises private network and the cloud shows you’re managing and migrating the guest environments themselves across different locations, which is the hallmark of IaaS. If it were platform as a service, the focus would be on deploying applications on a managed runtime rather than handling the operating system and servers; software as a service would mean using a ready-made application without managing servers, and Desktop as a Service centers on hosting user desktops rather than general server infrastructure.