Cisco Certified Network Associate (CCNA) Practice Exam

Which of the following statements is true regarding VLANs?

1. VLANs allow for physical separation of users

2. VLANs help in increasing broadcast traffic

3. VLANs can enhance network security

4. VLANs do not affect bandwidth usage

The correct answer is: VLANs can enhance network security

VLANs, or Virtual Local Area Networks, are used to enhance network security by logically segmenting a network without requiring physical separation of devices. By creating VLANs, different user groups can be isolated from one another, which limits the ability of users in one VLAN to access resources in another without proper permissions. This isolation helps to contain potential security breaches within a specific user group, ensuring that sensitive information is not readily available to all users on the network. In addition to improving security, VLANs also play a significant role in reducing unwanted broadcast traffic and optimizing bandwidth usage. When broadcast traffic is contained within a VLAN, it does not propagate to other VLANs, which efficiently manages network performance. Therefore, the assertion regarding VLANs enhancing network security accurately reflects their primary capabilities and benefits within networking environments, especially in organizational contexts.