 are used to connect traffic to the Internet as well as to select routes to other networks. Firewalls are hardware or software that is designed to protect networks from hackers by looking for and blocking unusual header information and known viruses and to detect outgoing messages with confidential and private information. DPI VS. Stateful Inspection Stateful inspection refers to the ability to look at packets in real time as they are transmitted. Both DPI and Stateful Inspection examine packet headers in real time. However, only DPI has the ability to look at both the actual data bits users send and receive. Because it only examines the headers, Stateful Inspection is faster than DPI. Both Stateful Inspection and DPI are used to screen out malicious packets as they enter networks. However, DPI is slower because it looks at both the header and content in packets. Because it looks at both the data content and the header data, DPI is better at catching known malicious code. Stateful inspection is better suited to screening for packet storms caused by denial of service attacks, when hackers try to overwhelm a network by sending it millions of packets per second. Because of their different capabilities, many companies use both DPI and Stateful Inspection. www.TechnicalPDF.com COMPRESSION Compression is a technology that reduces the size of video, data, image, and voice files SO that they take up less space in networks and on hard drives in computers. Compression has the same effect as a trash compactor that reduces the amount of space trash consumes. Compression shrinks the size of files without materially changing images or text. The benefit of compression is that it dramatically decreases the amount of network capacity (bandwidth) needed to transmit high definition TV, music, and movies. Compression additionally facilitates the ability of companies to store video files, and large databases can use less disc space on computer storage systems. The ability to store more information using less computer capacity has led