Council ICT Network Architecture integrates on-premises core infrastructure with third-party SaaS and hosted services across democratic services, housing, finance, and planning domains. The three-layer design—core firewalls and switches, DMZ web front ends, and access-layer applications—separates trust boundaries using VLANs and connection types (uplinks, data interfaces, APIs, payment channels). This architecture demonstrates how councils balance legacy systems like Oracle DBMS and Microsoft Active Directory with modern cloud services including Microsoft Teams, Entra AD, and Civica E-Pay. Fork this diagram on Diagrams.so to customize for your council's specific applications, third-party integrations, or security policies. The legend-driven connection types enable clear documentation of data flows and compliance requirements across public-sector workloads.