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Networking Fundamentals · Intermediate

tcpdump

A command-line packet capture tool for Unix-like systems.

Definition

tcpdump captures traffic using BPF filters and can write pcap files for later analysis in Wireshark.

Example

tcpdump -i eth0 -w capture.pcap port 53 captures DNS traffic.

Exam tip

tcpdump = CLI capture; Wireshark = GUI analysis.

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