Cloud Computing

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Cloud computing can be defined as: “a variety of computing concepts that involve a large number of computers connected through a real-time communication network such as the Internet.” Our understanding of cloud computing is distributed computing over a network with the ability to run a program or application on many connected computers at the same time.
From our research we can describe Cloud computing as both a platform and a type of application. The Cloud computing platform offers, configures, reconfigures and provisions hardware and software services as needed. Server equipment in the cloud can be physical or virtual machines. Clouds in actuality also offer storage area networks (SANs), network equipment, firewall and other security devices. Cloud computing refers to applications that are not stored or ran from the local systems, but that exist on the cloud and are accessed remotely. Any user with suitable internet connection and standard browser can access a pool of virtualized computer resources in the cloud.
Thus, a cloud is an extension of the IT environment (hardware, data center, data storage and software) that is not operated locally within a company, but instead trough providers hired as a service usually located in a different geographic location. The applications and data are no longer in the LAN, but now exist in the virtual cloud. Most providers of cloud solutions leverage the pooling effects that arise from the sharing of resources for their business model.

ARCHITECTURE:
In order to better understand the structure of cloud computing professionals divide the system into two sections: the front and the back end, which are connected through a network, usually the Internet. The front end is what end users normally see...

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...rg/10.1016/j.jss.2013.04.021.
(http://www.sciencedirect.com/science/article/pii/S0164121213000915)
Derrick Rountree and Ileana Castrillo, Chapter 6 - Evaluating Cloud Security: An Information Security Framework, In The Basics of Cloud Computing, edited by Derrick Rountree and Ileana Castrillo, Syngress, Boston, 2014, Pages 101-121, ISBN 9780124059320, http://dx.doi.org/10.1016/B978-0-12-405932-0.00006-2.
(http://www.sciencedirect.com/science/article/pii/B9780124059320000062)
Rajkumar Buyya, Christian Vecchiola and S. Thamarai Selvi, Chapter 11 - Advanced Topics in Cloud Computing, In Mastering Cloud Computing, edited by Rajkumar Buyya, Christian Vecchiola and S. Thamarai Selvi, Morgan Kaufmann, Boston, 2013, Pages 373-427, ISBN 9780124114548, http://dx.doi.org/10.1016/B978-0-12-411454-8.00011-5.
(http://www.sciencedirect.com/science/article/pii/B9780124114548000115)

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