I have four hosts called A, B, C, D.
A has IP Address 192.168.0.97.
B has IP Address 192.168.0.99.
C has IP Address 192.168.0.98.
D has IP Address 192.168.0.99.
A and B are connected to each other through an ethernet switch S1.
C and D are connected to each other through an ethernet switch S2.
S1 and S2 are not connected to one another.