aders of packets as well as user content. It inspects and looks for patterns in header information, such as error correction, quality of service, and end-of-message bits, and sometimes the e-mail messages themselves. Large, modern packet networks typically carry a mix of rich media traffic, including television, movies, game, voice, and music streams, as well as data. Faster processers and more affordable memory have led to DPI switches and software that enable carriers, large universities, and enterprises to manage congestion in real time as well as offer new services on these diverse mobile and landline networks. Depending on how it's configured, DPI equipment can monitor the header only or the header plus the user data (payload) of e-mail and instant messages. Capturing the payload of a message is referred to as data capture. Data capture can be used to store messages for later scrutiny www.TechnicalPDF.com or to scan messages in real time. Either function requires high-speed processors and massive storage archives. Deep packet inspection is one tool that organizations, telephone companies, and governments use to manage traffic in the following scenarios: On a specific carrier's Internet networks Between residential customers and their carriers On mobile networks Between enterprise locations On enterprise links to the Internet Within the internal networks of an enterprise In addition to the above functions, deep packet inspection is used to censor messages critical of governments. DPI in Organizations: Protecting Confidential Information Organizations use Deep Packet Inspection to block access to specific non-business-associated web locations such as Facebook (the social network site) to cut down on unnecessary traffic on their networks and increase employee productivity. Importantly, they also use Deep Packet Inspection to protect their networks against hackers. Private organizations use DPI to ensure that intellectual property is not leaked. For example, it may monitor outgoing traffic for keywords. Healthca