Week 4 - Cloud Stack Model

 As I have learned about different types of models, they explain how hardware and networks communicate. Models such as the OSI and TCP/IP are examples of this. To expand further on this, is the Cloud Stack Theoretical Model (CSTP). In this model, there are 5 layers. In order are the Physical, Virtualization, Network, Image, and Application layers. 

Starting with the physical layer, the equipment and hardware are necessary to run the cloud systems. This includes all the networking devices, cables, servers, and cooling systems. As with the OSI and TCP/IP models, the physical layer is required as without the physical layer, there is no hardware for the cloud to run on.

The virtualization layer is the transfer of physical hardware to virtual hardware. In this layer, there are the hypervisors that enable the connection between the hardware and software to be established. One of the most well-known examples of this is VMWare. In fact, I remember using VMware in school at times.

The network layer is the layer that provides the infrastructure as code. This layer will hold, create, and manage the virtual networks. This layer is where IaaS clients can manage access control, costs, security, and various different services. 

The Image/Operating System layer provides instances and services that support the features needed on the application layer. The data storage, workloads, and data processing occur at this layer. PaaS clients can control the operating system environments for their development, testing, and hosting. 

Finally, there is the Application layer. The application layer controls the functions of balancing the workloads and the firewalls that create secure environments. SaaS clients can be presented with applications too.

These 5 layers play a role in cloud computing. Hopefully, this explanation gives a basic gist of how each of the layers works.