The cloud model being used in this scenario is Hybrid cloud.
Hybrid cloud is a cloud computing environment that combines a private cloud environment (i.e., on-premises data center) with one or more public cloud environments (i.e., third-party cloud service providers). In a hybrid cloud environment, the private and public cloud environments are integrated, and data and applications can be shared between them.
In this scenario, the cloud service provider has created an environment that allows customers to connect their existing local networks (i.e., private cloud) to the cloud service provider's environment (i.e., public cloud) for additional computing resources. This integration between the private and public cloud environments is characteristic of a hybrid cloud environment.
Additionally, the cloud service provider has blocked internal HR applications from reaching the cloud, which is an example of how security can be managed in a hybrid cloud environment. By limiting access to certain applications and data, organizations can maintain control over sensitive information while still leveraging the benefits of cloud computing.