Your network has two switches (SW1 and SW2) connected via a trunk link.
SW1 has PC-A in VLAN 10 (port Fa0/1) and PC-B in VLAN 20 (port Fa0/2).
SW2 has PC-C in VLAN 10 (port Fa0/3) and PC-D in VLAN 20 (port Fa0/4).
There is a trunk between switches SW1 and SW2:
**Symptom:**
PC-A can ping PC-C, but PC-B cannot ping PC-D, even though both pairs are in the same VLANs. What is wrong and how would you fix it? ๐ค