Network attacks

In computer and computer networks an attack is any attempt to destroy, expose, alter, disable, steal or gain unauthorized access to or make unauthorized use of an asset.

http://standards.iso.org/ittf/licence.html

There are a number of reasons that an individual(s) would want to attack corporate networks. The individuals performing network attacks are commonly referred to as network attackers, hackers, or crackers.

A few different types of malicious activities that network attackers and hackers perform are summarized here: http://www.tech-faq.com/network-attacks.html image-
 * Illegally using user accounts and privileges
 * Stealing hardware
 * Stealing software
 * Running code to damage systems
 * Running code to damage and corrupt data
 * Modifying stored data
 * Stealing data
 * Using data for financial gain or for industrial espionage
 * Performing actions that prevent legitimate authorized users from accessing network services and resources.
 * Performing actions to deplete network resources and bandwidth.

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