Learn in the textbookConnecting Devices That Make Up a Network
DefinitionA VLAN (virtual LAN, 仮想LAN) is a way to split one LAN into several logical groups through switch settings, without changing the physical wiring.
ExplanationEven on the same switch, devices in different groups are treated as separate LANs, and data does not pass directly between them. Traffic between groups has to be relayed by a router or a Layer 3 switch. When people change desks or the organization is reshuffled, group membership can be changed by settings alone, without rewiring.
Memory hookThe V stands for virtual. VPN uses the same V, so tell them apart by what follows: LAN or PN (Private Network).