Network Security Concepts is start from authenticating users,
Commonly (one-factor authentication) with a username and a password.
With two-factor authentication something you always used in your daily life (e.g. a security token or ‘dongle’, an ATM card, or your mobile phone, login computers ),
or with Three-factor authentication as an additional security features that some of us also used (e.g. a fingerprint or retinal scan).
Once authenticated, a stateful firewall will enforce the access policies such as what services
are allowed to be accessed by the network users. This is effective to prevent unauthorized access, this component can’t check potentially harmful content such as computer worms being transmitted over the network.
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