I have two machines connected via a managed network switch capable of supporting 10 Gbps bandwidth.
What would the bandwidth be if I transfer data from machine 1 with a 2.5 Gbps network card to machine 2 with a 10 Gbps network card?
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You've likely heard of the expression "a chain is only as strong as its weakest link".
The same concept is true of most things, network connectivity and performance not withstanding. Your throughput will only be as fast as the slowest member. So, if you have one side that is only capable of 2.5Gbps and another that is capable of 10Gbps, you will be limited to 2.5Gbps. Realistically, your transfer rate may not ever reach even that.