Secure Access Service Edge (SASE) combines software-defined wide-area networking (SD-WAN) with cloud-delivered security services into a unified architecture. As organizations adopt hybrid work models and multi-cloud strategies, SASE eliminates the need to backhaul traffic through centralized data centers for security inspection.
Building Blocks of a SASE Deployment
A complete SASE solution integrates SD-WAN for optimized connectivity, Secure Web Gateway (SWG) for web filtering, Cloud Access Security Broker (CASB) for SaaS visibility, Zero Trust Network Access (ZTNA) replacing traditional VPNs, and Firewall-as-a-Service (FWaaS) for consistent policy enforcement regardless of user location.
Leading SASE platforms from Zscaler, Palo Alto Prisma, and Netskope process security policies at points of presence distributed globally, ensuring that users experience minimal latency regardless of their location. Single-pass inspection architectures examine traffic once for all security functions, avoiding the performance penalty of serial security appliance chains.
Migration to SASE is typically phased, starting with ZTNA to replace VPN concentrators, then adding SWG and CASB capabilities. Organizations report 40-60% reduction in networking and security infrastructure costs after full SASE adoption, alongside improved security posture from consistent policy enforcement.