Cloud Computing

Cloud Computing

1. What is a cloud computing?

   • is a model for enabling convenient, on-demand network access to a shared pool of configurable computing resources (e.g., networks, servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction.
     • MAIN TYPES OF COLLABORATIVE TOOLS
       • PLATAFORM AS A SERVICE:
         • PaaS (platform as a service) refers to the provision of services that enable customers to deploy, in the cloud, applications created using programming languages and tools supported by the supplier.
       • SOFTWARE AS A SERVICE:
         • SaaS (software as a service) refers to the provision of software applications in the cloud.
       • INFRAESTRUCTURA AS A SERVICE:
         • IaaS (infrastructure as a service) refers to services providing computer processing power, storage space and network capacity, which enable customers to run arbitrary software (including operating systems and applications) in the cloud.
     • TYPES OF CLOUDS
       • PUBLIC CLOUDS: Public clouds are those in which services are available to the public at large over the internet.
       • PRIVATE CLOUD: A private cloud is essentially a private network used by one customer for whom data security and privacy is usually the primary concern. The downside of this type of cloud is that the customer will have to bear the significant cost of setting up and then maintaining the network alone
       • COMMUNITY CLOUD: Community clouds usually exist where a limited number of customers with similar IT requirements share an infrastructure provided by a single supplier. The costs of the services are spread between the customers so this model is better, from an economic point of view, than a single tenant arrangement.
       • HYBRID CLOUD: Hybrid cloud environments are often used where a customer has requirements for a mix of dedicated server and cloud hosting, for example if some of the data that is being stored is of a very sensitive nature. In such circumstances the organization may choose to store some data on its dedicated server and less sensitive data in the cloud. Another common reason for using hybrid clouds is where an organization needs more processing power than is available in-house and obtains the extra requirement in the cloud.