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3rd Edition: Chapter 4
3rd Edition: Chapter 4

... upper layer protocol to deliver payload to ...
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... OSI and TCP IP difference • OSI model distinguishes between an interface and a protocol TCP IP does not • The OSI model clearly mentions the physical and data link layers. • The Internet provides both, connection oriented service over connectionless transfer and connectionless service over connecti ...
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... quality of the video experience for users. Rich media applications using video must meet user needs and expectations, regardless of their location, the device they are using, or the content they are accessing. IT groups are tasked with specifying and implementing the network requirements that will s ...
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... quality of the video experience for users. Rich media applications using video must meet user needs and expectations, regardless of their location, the device they are using, or the content they are accessing. IT groups are tasked with specifying and implementing the network requirements that will s ...
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Deep packet inspection

Deep Packet Inspection (DPI, also called complete packet inspection and Information eXtraction or IX) is a form of computer network packet filtering that examines the data part (and possibly also the header) of a packet as it passes an inspection point, searching for protocol non-compliance, viruses, spam, intrusions, or defined criteria to decide whether the packet may pass or if it needs to be routed to a different destination, or, for the purpose of collecting statistical information. There are multiple headers for IP packets; network equipment only needs to use the first of these (the IP header) for normal operation, but use of the second header (TCP, UDP etc.) is normally considered to be shallow packet inspection (usually called Stateful Packet Inspection) despite this definition.There are multiple ways to acquire packets for deep packet inspection. Using port mirroring (sometimes called Span Port) is a very common way, as well as an optical splitter.Deep Packet Inspection (and filtering) enables advanced network management, user service, and security functions as well as internet data mining, eavesdropping, and internet censorship. Although DPI technology has been used for Internet management for many years, some advocates of net neutrality fear that the technology may be used anticompetitively or to reduce the openness of the Internet.DPI is used in a wide range of applications, at the so-called ""enterprise"" level (corporations and larger institutions), in telecommunications service providers, and in governments.
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