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Are there network monitoring tools for Layers 1 through 7?

Are there any monitoring tools that can monitor my network all the way from Layer 1 up to Layer 7?

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Good question. The first tool that comes to mind is a sniffer. Sniffers, like Wireshark, can examine traffic from the Ethernet frame all the way up to the application layer. Tools like Snort also have this ability.

This was first published in August 2007

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