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Introduction Network Operating System (NOS) is one of the most prominent elements in Information systems. The effective and proper choice of the same depends upon the type and size of the organization is a vital factor. If the NOS is not properly selected according to the requirements, it will affect the overall functioning of the IT department and also on the business performance. NOS are a type of system that is functioned in the computer which helps in the transfer of data and its sharing within the Local Area Networks. In this network operating systems merit copy, the understanding the network operating system principles and the proper selection of the NOS is discussed along with the different types of NOS. The implementation of NOS has to be planned properly considering the Disaster Recovery Plan. The various phases in the disaster recovery is also examined in this report. The implementation process has to be proper so that the further issues and possibilities of disaster happ...

A software development process or life cycle is a structure imposed on the development of a software product. There are several models for such processes, each describing approaches to a variety of tasks or activities that take place during the process. There is various Software development models or methodologies. They are as follows: Waterfall model V model Incremental model RAD model Agile model Iterative model Spiral model Prototype model Waterfall Model: There are total 7 models in software development . Waterfall model is a popular model of the system development life cycle . It is very simple to use and understand. In a waterfall model, each phase must be completed before the next phase can begin and there is no overlapping in the phases . Requirements: Requirements is the initial step in the waterfall model. All possible requirements of the system to be developed are captured in this phase and documented in a requirement specification document. In t...