ethernet card mode

Hello.

How can I check what mode my ethernet card is working on?
My datacenter says it is 1 Gbit and they show me MRTG graph of my bandwidth with about 10 Mb spikes (their MRTG takes an info from a router) but I have own mrtg installed at the server and it shows less then 1 Mb spikes. So I assume my ethernet card works as 10 Mbit card.

Are there some tests how I can prove that?

My server is running under RedHat Linux 7.3

Thank you.

 

 

 

 

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