Benefits of Creating VLANs | Cisco Exam 200-125

Benefits of Creating VLANs

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Which two benefits are provided by creating VLANs? (Choose two.)



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A. B. C. D. E.


A VLAN is a switched network that is logically segmented on an organizational basis, by functions, project teams, or applications rather than on a physical or geographical basis.


VLANs also improve security by isolating groups. High-security users can be grouped into a VLAN, possible on the same physical segment, and no users outside that VLAN can communicate with them

LAN Segmentation -

VLANs allow logical network topologies to overlay the physical switched infrastructure such that any arbitrary collection of LAN ports can be combined into an autonomous user group or community of interest. The technology logically segments the network into separate Layer 2 broadcast domains whereby packets are switched between ports designated to be within the same VLAN. By containing traffic originating on a particular LAN only to other LANs in the same VLAN, switched virtual networks avoid wasting bandwidth.

VLANs (Virtual Local Area Networks) are logical networks that allow you to segment your physical network into multiple broadcast domains. VLANs can be used to provide several benefits in a network environment. The two most significant advantages of creating VLANs are:

  1. Provides Segmentation VLANs allow network administrators to create logical groups of devices, regardless of their physical location or connectivity. Devices that are grouped in a VLAN can communicate with each other, but they are isolated from devices that are in other VLANs. This segmentation helps to control network traffic and improve network performance by reducing broadcast and multicast traffic.

  2. Added Security VLANs provide enhanced security by limiting the communication between devices. By isolating devices in different VLANs, you can prevent unauthorized access to sensitive information and reduce the risk of security breaches. VLANs also make it easier to apply security policies, such as access control lists (ACLs), to specific groups of devices.

The other options are not valid benefits of creating VLANs:

  • Dedicated Bandwidth: VLANs do not provide dedicated bandwidth. Instead, they allow you to segment your network, which can help to improve network performance by reducing broadcast and multicast traffic.
  • Allows switches to route traffic between subinterfaces: VLANs are used to segment networks, not to route traffic between subinterfaces.
  • Contains Collisions: VLANs do not contain collisions. Collisions occur when two devices try to transmit data on the same network segment at the same time. VLANs do not prevent collisions, but they can reduce them by segmenting the network into smaller broadcast domains.