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vulture714

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How do I run diagnostics on a systems network card?

How do I run diagnostics on a systems network card?
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10023

ping 127.0.0.1    to test loopback
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The manufacturer of the network card will usually have a diagnostic that can be run on it.  What is your system make/model, and what is the make/model of your network card?
Whether it is a add-on PCI card or built-in to the motherboard, what diagnostics a NIC (aka network card/adapter) offers varies by manufacturer.  Check the identity of the network card in Device Manager and then see what diagnostics the manufacturer offers for testing the card specifically on the manufacturer's website.
Some cards driver includes a tab or button for diagnostics or tests in the advanced properties of the device.

For the "general" case, you can certainly do some simple diagnostic steps.  
As far as TCP/IP which is prettymuch the defacto protocol now since it is the protocol of the Internet,
ping 127.0.0.1
 is a good one, that is the "specially" defined IP address that is for loopback test, aka goes back to yourself.  
ipconfig /all
 is another that will show adapters TCP/IP protocols status.
You might want to run from a command prompt run "as administrator" if Vista/7.
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nobus
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