Define network security ?

Network security is protection of the access to files and directories in a computer network against hacking, misuse and unauthorized changes to the system.

An example of network security is an anti virus system.

The authorization of access to data in a network, which is controlled by the network administrator. Users are assigned an ID and password that allows them access to information and programs within their authority. See authentication. See also computer security and information security.

(2) Protecting the computer systems in the network from unwanted intrusions.

Read more at http://www.yourdictionary.com/network-security#rQLpaqOWpOZRvq6S.99

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