Throughput Vs Bandwidth

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In the following scenario we design 2 nodes sending packets with different bandwidth. The first node, 'client-fast' (blue color), is using a 3Mbps bandwidth link against 'client-slow' (aqua color) which use only 1Mpbs. We examine the throughput at the 'Server' node for both flows. It is clear from the chart that TCP throughput is subject to changes in bandwidth.