What is a VLAN?

A VLAN, or Virtual Local Area Network, is a technology that allows for the creation of multiple logical networks on a single physical network. This means that even though devices may be connected to the same physical network infrastructure, VLANs enable them to communicate as if they are part of separate networks. This segmentation improves network efficiency, enhances security by isolating sensitive data, and simplifies management by allowing administrators to group devices based on function rather than physical location.

For instance, in an office, employees from different departments can be grouped into separate VLANs. This prevents unnecessary traffic between departments and provides an extra layer of security, as each department operates within its own logical network.

The other options don’t accurately describe what a VLAN does. A physical connection refers to how devices are linked, encryption pertains to securing data, and increasing connection speed relates to bandwidth rather than logical segmentation.