What is the primary purpose of creating a VLAN in a switch network?

• A. To create multiple broadcast domains and segment traffic.
• B. To reduce the number of switches required.
• C. To increase physical distance between devices.
• D. To eliminate the need for routers.

Answer: (A)

VLANs partition a switch network into separate, logical networks. Each VLAN creates its own broadcast domain, so broadcast and multicast traffic from devices in one VLAN stays within that VLAN and doesn’t reach devices in others. This reduces unnecessary traffic on each segment, improves performance, and adds a layer of security by isolating groups of devices. When devices in different VLANs need to talk, they require inter-VLAN routing through a router or a layer-3 switch, since routing between VLANs is needed for cross-VLAN communication. The other ideas don’t fit because VLANs don’t reduce the total number of switches, don’t extend physical distance, and don’t remove the need for routing resources.