A Virtual Local Area Network (VLAN) is like creating separate “lanes” on the same road. Even though all your devices are connected to the same physical network, VLANs group them logically so they only talk to the right devices.
Businesses like yours need networks that are secure, efficient, and scalable. VLANs and managed switches make this possible.
Why VLAN Tagging?
VLANs allow you to logically segment a single physical network into multiple isolated networks. When data moves between network devices, we need a way to mark which “lane” it belongs to. VLAN tagging adds a small label (called a tag) to each data packet so switches know which VLAN it should stay in.
Why is this important for you?
- Better Security:
Testing equipment, CCTV, Phone, admin PCs, and guest devices can be kept in separate VLANs. This means sensitive test data doesn’t mix with office traffic or visitor devices. - Bandwidth Control:
Each VLAN can have its own rules. For example, heavy diagnostic/CCTV data won’t slow down your admin systems because they’re in different “lanes.” - Simpler Management:
You can easily add or move devices without rewiring—just assign them to the right VLAN.
Managed Switches – Control and Visibility
To create VLAN’s you will need Managed switches and they provide the intelligence to enforce VLANs and optimise traffic:
- Full VLAN Support
Create and manage secure network segments. - Traffic Prioritisation (QoS)
Ensure critical services like VoIP and video conferencing run smoothly. - Monitoring & Troubleshooting
Advanced tools for diagnosing issues and maintaining uptime. - Future-Proof Features
Support for Power over Ethernet (PoE), link aggregation, and inter-VLAN routing.
Drawbacks of Unmanaged Switches
- No VLAN Awareness: Breaks segmentation, creating security risks.
- No Control: Cannot configure VLANs, QoS, or port security.
- More Broadcast Traffic: Causes congestion and slows performance.
- No Monitoring: Harder to troubleshoot and maintain reliability.
- Unmanaged Switches Cannot Handle VLANs
- The two switches labeled “Unmanaged Switch” cannot interpret VLAN tags (802.1Q). They simply forward frames without considering VLAN IDs.
- This means VLAN separation is lost as soon as traffic passes through an unmanaged switch. All VLANs would effectively merge into one broadcast domain.
- Incorrect VLAN Segmentation
- The diagram shows VLAN 10, 20, and 30 running through unmanaged switches as if they maintain isolation. In reality, unmanaged switches cannot enforce VLAN boundaries, so devices connected to them would all be in the same network.
- Trunk Links Misrepresented
- VLANs typically require trunk ports between managed switches to carry multiple VLANs using tagging.
- The image suggests separate physical links for each VLAN, which is inefficient and not how VLANs are usually implemented.
- Security Implication
- Using unmanaged switches in a VLAN design introduces risk because VLAN isolation is broken, and broadcasts from any VLAN can leak across the network.
Correct Approach
- Use managed switches for all devices that need VLAN separation.
- Configure trunk ports between switches to carry multiple VLANs over one link using 802.1Q tagging.
- Avoid unmanaged switches in environments where VLANs are required.
Why VLAN’s matter for your business
Together, VLANs and managed switches deliver a network that is:
✅ Secure – Protect sensitive data
✅ Efficient – Reduce congestion and improve performance
✅ Scalable – Ready for future growth
✅ Easy to Manage – Simplify administration and troubleshooting
Investing in VLANs and managed switches means building a network that works smarter, not harder – giving your business the reliability and security it needs to thrive.
Until next time …
Ready to secure your network? Contact EC Computers Today
Contact EC Computers today and discover why we’re the go-to choice for managed IT services in Bristol.
– Call 0117 200 1000 for help today, especially if you are looking for any or all of these:
- Best managed IT services in Bristol
- Affordable IT support for Bristol businesses
- Why choose local IT support in Bristol
- Bristol IT experts for small businesses
- Reliable managed IT services near me
Further reading: Managed IT Services and Support
Importance of strong passwords – Backup of Microsoft 365 external to inbuilt recovery – Privacy compliance and new 2025 laws