Network segmentation — VLANs & firewall zoning
PCI DSS requires that the cardholder data environment (CDE) be isolated from systems that have no business need to communicate with it. Emirtech designs and implements VLAN-based segmentation that separates payment terminals, POS servers and payment gateways into a dedicated network zone, enforced by firewall rules that permit only the traffic flows documented in the cardholder data flow map. Proper segmentation reduces the scope of a PCI DSS assessment considerably — meaning fewer systems are subject to the full set of controls — and is one of the highest-value technical steps an Abu Dhabi merchant can take before engaging a QSA.

