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How do I find out if my Lan (NIC) card working at full or halt duplex mode / speed under Linux?

April 26, 2017card DUPLEX Halt LAN linux mode NIC speed working

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How do I find out if my Lan (NIC) card working at full or halt duplex mode / speed under Linux?

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A. LAN card or NIC is use to send and receive data. Technically, we use word Duplex for this functionality. Full duplex means you are able to send and receive data (files) simultaneously. In half duplex, you can either send or receive data at a time (i.e. you cannot send receive data (files) simultaneously). Obviously, full duplex gives you best user experience. However, how can I find out whether I am using full duplex/half duplex speed/mode?