Ethernet LAN BEFORE VLANs:
PC0 192.168.1.1 -> PC3 192.168.1.4 : Ping Successful

SWITCH CLI show vlan brief (abbreviated):
VLAN  Name     Status  Ports
1     default  active  Fa0/5 ...
10    SALES    active  Fa0/1, Fa0/2
20    HR       active  Fa0/3, Fa0/4

VLAN test AFTER separate IP addressing:
PC0 192.168.10.1 -> PC1 192.168.10.2 : SUCCESS
PC2 192.168.20.1 -> PC3 192.168.20.2 : SUCCESS
PC0 192.168.10.1 -> PC2 192.168.20.1 : FAIL (no inter-VLAN routing)

Wireshark display filter: eth
Ethernet II: Destination <MAC>, Source <MAC>, Type IPv4 (0x0800)
Display filter: arp
ARP Request/Reply with sender/target IP and MAC.
