Which of the following is true about a Virtual Local Area Network (VLAN)?

A Virtual Local Area Network (VLAN) is a logical grouping of devices on a network that allows them to communicate as if they were on the same physical network, even if they are not. The defining characteristic of a VLAN is that it restricts communication to devices that are part of the same VLAN, effectively creating a segmented network environment. Therefore, it is true that users can only communicate within their own group.

This design enhances security and efficiency on the network. Each VLAN operates independently of one another, which means that devices on different VLANs cannot communicate unless there is specific routing configured to allow that. This is particularly useful for organizing users, applications, or departments within an organization while managing bandwidth and enhancing security.

In contrast, stating that VLANs allow for communication among all users in the entire network implies an unrestricted access model, which goes against the purpose of VLANs. Additionally, while VLANs can help in managing network traffic, they do not create physical separations; this is a common misconception, as VLANs are primarily logical constructs. Simplification of network management is also a benefit of VLANs, but the defining trait is their ability to limit communication to users within a specific group.