Say I have 2 identical unmanaged gigabit switches on a network, A and B. There are computers connected to switch A, there are other computers connected to switch B. A and B are connected via 1 cable. So, the total (theoretical) bandwidth available for computers on A to talk to computers on B is 1Gbit/sec. All is well.
If I now connect a second cable between the switches, and make no other changes, would the total (theoretical) bandwidth between the 2 groups of computers go up to 2Gbit/sec?