implementing-network-segmentation-with-firewall-zones

# Implementing Network Segmentation with Firewall Zones ## Overview Network segmentation divides a flat network into isolated security zones with firewall-enforced boundaries to contain breaches, restrict lateral movement, and enforce least-privilege access between workloads. Segmentation is a foundational control required by PCI DSS, HIPAA, NIST 800-53, and zero trust architectures. Modern segmentation combines traditional VLAN-based approaches with microsegmentation at the workload level for granular east-west traffic control. This skill covers designing zone architectures, configuring inter-zone firewall policies, implementing VLAN segmentation on switches, and deploying microsegmentation for dynamic environments. ## When to Use - When deploying or configuring implementing network segmentation with firewall zones capabilities in your environment - When establishing security controls aligned to compliance requirements - When building or improving security architecture for this domain - When conducting security assessments that require this implementation ## Prerequisites - Network topology documentation with asset inventory - Firewall supporting zone-based policies (Palo Alto, Fortinet, Cisco Firepower) - Managed switches with VLAN support (802.1Q trunking) - Traffic flow documentation or NetFlow data for baseline analysis - Compliance requirements (PCI DSS scope, HIPAA ePHI boundaries) ## Core Concepts ### Zone Architecture Tiers | Zone | Trust Level | Examples |...