They can capture the actual data of the packet if it is not encrypted during data transmission.Experienced users use the filtered mode when using the packet sniffer and capture the specific information. Collecting all the packet data will make the information overload.
These tools are suitable for large enterprises. Paid or commercial tools provide features like intuitive analysis along with capturing data, deep packet inspection, graphs & charts and alerts on exception cases, etc. For simple sniffing and quick diagnostics, free & open-source tools will be a good option. Some tools are simple and provide reliable & clean data collection and leave a small footprint.
Pro Tip: Various free & open sources as well as commercial tools for packet sniffing are available.
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