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Wireshark Beginner's Guide: Capturing and Analyzing Network Traffic for Security

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Wireshark is a free, open-source network protocol analyzer widely used by security professionals and system administrators to capture and inspect network traffic at the packet level. The tool enables users to examine details such as source and destination IP addresses, ports, protocols, DNS queries, TCP flags, and TLS metadata. Its interface is divided into three main panels — Packet List, Packet Details, and Packet Bytes — giving analysts a layered view of network activity. Display filters for protocols like DNS, HTTP, and TCP help investigators narrow down large captures to relevant traffic during security incidents. Beginners are advised to practice in controlled environments such as virtual machines or test networks before applying the tool to real-world investigations.

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