Four Characteristics Of Cloud Computing

i) Front End: The front end refers to the client part of cloud computing system. It consists of interfaces and applications that are required to access the cloud computing platforms, Example - Web Browser. ii) Back End: The back End refers to the cloud itself. It consists of all the resources required to provide cloud computing services. It comprises of huge data storage, virtual machines, security mechanism, services, deployment models, servers, etc.

A central server administers the system, monitoring traffic and client demands to ensure everything runs smoothly [7]. It follows a set of rules called protocols and uses a special kind of software called middleware. Middleware allows networked computers to communicate with each other.

1.2.1

• Maintenance: It is easy to maintain the applications of cloud computing as it does not require to be installed on every computer of the user and it can be easily accessed from different places.

• Multi-tenancy: Another main characteristics of cloud computing is its multi-tenancy. It includes sharing of resources among a large group of users.

• Performance: The performance of cloud computing applications is based on cloud which is used to denote a network on telephony schematics.

• Productivity: The productivity can be increased if the multiple users can work on the same data at the same time. By doing this, the time of the user will also be saved.

• Reliability: Reliability is another main characteristics which makes cloud computing suitable for business recovery and disaster recovery.

• Security: Security is increased when data is distributed over a large number of devices, as well as in multi-tenant systems which is shared by unrelated

The usage of resource can be monitored, controlled and reported which provides transparency between both the consumer and server.

• Cost: Cloud computing eliminates the capital expense of buying hardware and software and setting up and running on-site datacenters, the IT experts for managing the infrastructure. It adds up fast.

• Speed: Most cloud computing services are provided self service and on demand, so even vast amounts of computing resources can be provisioned in minutes, typically with just a few mouse clicks, giving businesses a lot of flexibility and taking the pressure off capacity planning.

• Global Scale: The benefits of cloud computing services include the ability to scale elastically. It means delivering the right amount of IT resources-for example, more or less computing power, storage and bandwidth etc.

1.5 Service Models of Cloud Computing:

The cloud-computing providers offer their services to different models. Among all models, three models are widely used in cloud computing [31]. These models are:-

1) Software as a Service (SaaS)

2) Platform as a Service (PaaS)

3) Infrastructure as a Service