Network security consists of policies and the provisions embraced by a network administrator track and to stop unauthorized access, abuse, modification, or refusal of a computer network and network-accessible resources. Network security includes the authority of accessibility to data in a network, which the network administrator controls. Network security covers various computer networks, both private and public, which are used in regular occupations running communications and trades among government agencies, companies and people. Networks may not be public, for example within an organization, and others which may be open to public accessibility. Network security is involved in other kinds of associations, businesses, and organizations. It does as its name describes: It secures the network, in addition to managing and shielding operations.