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This lesson focuses on Linux sniffing. Sniffing is a passive activity that involves opening ports and listening for data and can be a useful tool in identifying what kind of traffic is on a network. It can also tell you what kind of machine and how many machines are on a network. This lesson focuses on the following command line tools: Tcpdump: designed to receive pockets in a raw socket and print relevant bits on the screen. Tshark: used to capture packets into a file.