Abstract: Cloud computing has been envisioned as the next generation architecture of IT Enterprise. In the cloud, the data is transferred among the server and client. High speed is in important issues in networking. Cloud security is the current discussion in the IT world. Secure the data without affecting the network layer and protecting the data from unauthorised into the server. The data is secured in server based on choice of security method so that data is given high secure priority. Cloud computing has been fancied as the next generation architecture of IT enterprise .traditional solution, where the IT service are under proper physical, logical and personal controls cloud computing moves the application software and database to the large data centre, where the manager of the data and services may not be fully trustworthy.

Keywords: Cloud computing, IT Enterprise, Public model, Private model, Hybrid cloud, Community cloud.