In cloud environments, what are shared responsibility models and why are they important?

• A. The provider is solely responsible for all security controls.
• B. Division of security responsibilities between provider and customer.
• C. There is no shared responsibility; customers are on their own.
• D. Security is only about encryption in transit.

Answer: (B)

Shared responsibility models in cloud define how security duties are split between provider and customer. The provider takes care of the security of the cloud itself—the physical data centers, hardware, network infrastructure, and the foundational services and virtualization layers. The customer is responsible for what happens in the cloud for their own data and workloads—protecting data at rest and in transit, managing access and identities, configuring services securely, and monitoring their own apps and configurations.

This split matters because it clarifies who is accountable for which controls, helping organizations manage risk and meet compliance. The amount the provider handles depends on the service model: with more managed services, the provider handles more of the stack, while the customer retains control over data and configuration aspects. For example, in an infrastructure-as-a-service setup, you manage the operating system and application security, while the provider secures the underlying hardware and hypervisor. In a software-as-a-service setup, the provider handles most security layers, and you focus on data protection and user access.

Why the other ideas don’t fit: it’s not all on the provider, and it’s not only about encryption in transit. Shared responsibility means both sides have duties, and encryption is one important control among many, not the entire security picture.