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How do you check the current duplex value of a network card set to Auto negotiate in Windows?

Fresh5 days ago
Mar 15, 2026182905 views
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Problem

I would like to know what duplex (half or full) my network card has negotiated with a switch when they are both set to auto configuration in Windows.

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Fix for: How do you check the current duplex value of a network card set to Auto negotiate in Windows?

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At command prompt: Enjoy.

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