What is a disadvantage of not using VLAN on a network?

A key disadvantage of not using VLANs (Virtual Local Area Networks) on a network is that it leads to increased security risks associated with broadcast traffic. In a network without VLANs, all devices are part of the same broadcast domain, meaning that broadcast packets sent by one device are received by all other devices in that domain. This can enable unauthorized access and data interception, as any device can listen to all broadcasts, potentially allowing malicious actors to capture sensitive information or launch attacks.

Utilizing VLANs allows network administrators to segment the network into different logical groups, enhancing security by isolating segments from one another. This isolation limits the spread of broadcast traffic, controlling who can receive it and thereby reducing the risk of unauthorized access and enhancing the overall security posture of the network.

In contrast, options highlighting improved performance due to less segmentation, unrestricted device connections, and feature richness in data handling illustrate potential benefits of a less segmented approach, but they do not adequately address the security implications and vulnerabilities that arise in a flat network structure without the management capabilities provided by VLANs.