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11/07/2026 8:48 pm
TL;DR: VLANs create logical separation at Layer 2, but they do not inherently stop lateral movement or enforce granular access between devices, according to Zero Networks. That gap makes VLANs a foundation, not a complete segmentation strategy, especially in distributed environments where policy drift and misconfiguration can leave internal paths open.
NHIMG editorial — based on content published by Zero Networks: What Is a VLAN? Definition, Core Components, and Segmentation Strategies
By the numbers:
- VLANs remain one of the most popular network segmentation methods, leveraged by 30% of organizations today.
Questions worth separating out
Q: What breaks when manufacturing networks rely on VLANs for segmentation?
A: VLANs create broad trust zones, so once an attacker enters a segment, they can often move laterally to other reachable devices inside the same zone.
Q: Why do VLANs still matter if they are not true segmentation?
A: VLANs still matter because they reduce broadcast noise, simplify network organisation, and provide a coarse isolation layer that supports other controls.
Q: What do security teams get wrong about microsegmentation?
A: They often treat it as a one-time network redesign instead of an iterative control that depends on current workload behaviour.
Practitioner guidance
- Map east-west trust paths across every VLAN Inventory which systems can talk across segment boundaries, then identify where routing or firewall exceptions create hidden lateral paths.
- Review inter-VLAN allow-rules for blast-radius exposure Treat every allow-rule as a containment decision, not a convenience setting.
- Anchor segmentation to identity and workload context Pair network segments with controls that recognise application identity, privileged access, and machine-to-machine flows.
What's in the full article
Zero Networks' full article covers the operational detail this post intentionally leaves for the source:
- Step-by-step explanation of VLAN membership, tagging, trunking, and inter-VLAN routing.
- Practical examples of when VLANs help and where they fall short in modern network design.
- Comparisons with firewall segmentation, SDN, application ringfencing, and physical segmentation.
- The vendor's automated microsegmentation workflow and how it is positioned against legacy segmentation.
👉 Read Zero Networks' explainer on VLAN limitations and segmentation strategies →
VLANs and segmentation gaps: are your controls keeping up?
Explore further
11/07/2026 9:15 pm
VLAN drift is a governance problem, not just a network design problem. Once organisations treat VLANs as equivalent to segmentation, policy quality becomes invisible and exceptions accumulate until the boundary stops meaning anything. That is a governance failure because ownership, review cadence, and enforcement discipline matter as much as topology. Practitioners should govern VLANs as an intermediate control, not a security outcome.
A question worth separating out:
Q: How should organisations reduce lateral movement in hybrid networks?
A: Use layered controls that combine logical network separation with explicit access enforcement. In hybrid environments, identity-aware microsegmentation, tightly scoped inter-segment rules, and continuous validation of allowed paths are more effective than static VLAN design alone. The goal is to constrain what can communicate, not just where traffic is grouped.
👉 Read our full editorial: VLANs are not segmentation: what practitioners need to know
