DPI (Deep Packet Inspection)
Deep Packet Inspection (DPI) is the act of any IP network equipment using any field other than the layer 3 destination IP address. This is performed as the packet passes an inspection point, searching for layer 4 and above information (e.g. the URI for HTTP protocol). In the context of WAN optimization and Application Performance Management (APM), DPI searches more specifically for protocol signatures and application or resource identification information. In the context of security, DPI searches more specifically protocol non-compliance, viruses, spam, intrusions information.
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