We have 3 VLANs (say A, B and C). Each of these VLANs are tagged links (T) between two L2 switches, as follows:SW 1 (T) <-> VLAN A <-> (T) SW 4SW 2 (T) <-> VLAN B <-> (T) SW 4SW 3 (T) <-> VLAN C <-> (T) SW 4                                  (T) |____...