The problem
Flat networks can become difficult to secure when every device shares the same broadcast domain.
Recommended approach
Use VLANs when there is a clear need to separate users, servers, guest Wi-Fi, CCTV or management traffic.
Step-by-step checklist
- Define the traffic groups.
- Assign VLAN IDs and subnets.
- Configure switch trunks and access ports.
- Add firewall routing policies.
- Test permitted and blocked paths.
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