Cisco Networking Essentials (25B) Practice Exam

The acronym VLAN stands for Virtual Local Area Network. A VLAN is a logical grouping of devices on one or more physical networks, allowing them to communicate as if they were on the same local network even if they are physically separated. This technology enhances network efficiency and security by allowing network administrators to segment networks according to function, team, or project, rather than solely based on physical location.

Each VLAN operates within a larger network infrastructure but can have its own unique broadcast domain, which helps to reduce broadcast traffic and increases the security and performance of the network. For instance, devices on different VLANs can communicate with each other only through a router, limiting the scope of broadcast traffic and increasing the control over inter-VLAN traffic.

This contrasts with the other choices, which do not accurately reflect the concept of VLANs. Variable terminology does not apply within the networking context, nor does "Long Access" relate to common network structures. Understanding that VLAN indicates a virtual grouping of devices that operate together enhances comprehension of how modern networking prioritizes efficiency and security.