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Network security includes many different things.
It covers computer security, ie. applying all the latest software fixes to your computer. It is virus protection and checking for the latest virus in the word document you found attached to a mail message. It covers firewalls, authentication, passwords, and all of the things you can think of to protect your computer from the evil hackers. Someday, your computer will be broken into or someone will do something to your network connection that prevents you from using the network. When this happens, you will be mad and will understand why you need to do your part.