Microsoft Azure: Cloud concepts and the shared responsibility model

What is cloud computing?

Cloud computing is the delivery of computing services over the internet. Cloud computing services are provided using the internet so it is not depended on physical infrastructure as a physical datacenter.

Shared Responsibility Model

The shared responsibility model shares the responsibilities of maintaining the infrastructure and software needed to keep the datacenter working between its provider and the consumer. Physical security, power, cooling, and network connectivity are the responsibility of the cloud provider and consumer is responsible for the data and information stored in the cloud.
The consumer is also responsible for access security, meaning you only give access to those who need it.

Cloud service types

• IAAS (Infrastructure as a service)

• PAAS (Platform as a service)

• SAAS (Software as a service)

Note: Based on the cloud service types the "Shared responsibility model" varies

The consumer is always responsible for the following:

• The information and data stored in the cloud

• Devices that are allowed to connect to your cloud (cell phones, computers, and so on)

• The accounts and identities of the people, services, and devices within your organization

The provider is always responsible for the following:

• The physical datacenter

• The physical network

• The physical hosts

Depending on the service type responsibility shared:

• Operating systems

• Network controls

• Applications

• Identity and infrastructure