I have added an image with a simple network.
I wondered, even if the access link between the two switches should be in the same VLAN,
what would happen if one end was in VLAN 10 and the other in VLAN 20.
I would have thought that it was possible the pings between PC 1 and PC 4, but the
simulator says the pings fail.
As the simulator sometimes is in error, what do you think?
I do not know if there is a control about the VLANs on the two ends of the link.