I am interested in knowing the maximum bandwith of our network. Can I use some freely downloadable utility or tool to find out if my intranet is 100BASET or 1000BASET, etc. or what is the maximum traffic it will allow ?
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on some operating sytems you can query the speed of the local NIC, but to know possible throughput of the rest of the network (switches, servers, internet conentcion, etc), you would need to speed test by doing a variety(*) of transfers.
The network admin may be also able to tell you and you may also be able to try and request a certain throughput using QoS, but both these methods in my experience tend to be unreliable
(*) eg, try non compressable data vs compressable data (VPNs often compress data). also try small blocks to see if there are latency issues, and of course try a simple large single stream. maybe also multiple streams .... etc.