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Computer network security is the line of defense that stops intruders from accessing your computer or network. Information stored on your computers include banking details, credit card credentials and communication logs either chat or email. You can live with someone reading you personal conversations but not when they steal your bank or credit card information. Intruders are discovering new vulnerabilities or loop holes every day. Developers or computer vendors often provide patches that cover up previous loop-holes. A "zero-day" attack is an attack that targets a vulnerability for which there is no solution easily available.

When the term ‘wireless networkÙ is used today, it usually refers to a wireless local area network (WLAN). A WLAN connects computers together through radio technology using standard network rules or protocols, but without the use of cabling to connect the computers together.

A WLAN can be installed as the sole network in a school or building. However, it can also be used to extend an existing wired network to areas where wiring would be too difficult or too expensive to implement, or to areas located away from the main network or building. The most obvious difference between wireless and wired networks, therefore, is that the latter uses some form of cable to connect computers together. A wireless network does not need cable to form a physical connection between computers. Wireless networks can be configured to provide the same network functionality as wired networks, ranging from simple peer-to-peer configurations to large-scale infrastructures accommodating hundreds of users.