Which cloud service model is responsible for the physical security of the facility and systems?

The Infrastructure as a Service (IaaS) model is responsible for the physical security of the facilities and systems. In IaaS, the cloud provider manages the hardware, networking, storage, and other physical resources. This includes ensuring that data centers have the necessary safeguards in place, such as surveillance, access controls, power supplies, and fire protection systems, to protect the physical servers and underlying infrastructure hosting the virtual environments.

Users of IaaS are responsible for security in the cloud, but the cloud provider takes on the responsibility for the physical aspects. This division of responsibility is a key characteristic of the IaaS model, differentiating it from other cloud service models, where the cloud provider's roles vary in terms of security responsibilities.