As per RGPV syllabus

1. Cloud reference Architecture

2. Cloud reference Architecture
Here the CLOUD RESOURCES offers or provide computing power
that are required for providing the services to the customers.
This layer of reference model is implemented by using a
datacenter(a large group of networked computer servers typically
used by organizations for the remote storage, processing, or
distribution of large amounts of data ) in which there are hundreds
and thousands of computer systems are linked together.
 the cloud infrastructure can be of in different natures because of
the availability of various resources.
The database systems and other storage devices are also be the
part of the infrastructure.

3. Cloud reference Architecture
The core middleware manages the physical infrastructure whose
objectives is to provide the run time environment for applications
and to utilize the resources.
Virtualization technologies are used to guarantee runtime
environment customization and quality of service.
By using virtual machine technology it is possible to partition the
hardware resources to meet the requirements of user.
The cloud applications are the one who meets with the
requirements of the user.
These applications are available as per the demand of the user.

4. Cloud reference Architecture
In this case the user has no need to build its own system
everything which he requires will be available on rent.
Infrastructure management is the key function of core middleware
which supports capabilities such as negotiation of the quality of
service, execution management, monitoring of services,
accounting and billing.