Research Note: SASE Architecture Layers and Functionality
SASE's Five-layer Model
SASE's five-layer model represents a revolutionary approach to network security that addresses the challenges of modern, distributed enterprises. The integration of identity-driven security with advanced networking capabilities provides a robust foundation for secure, efficient operations. Each layer builds upon the others to create a comprehensive security and networking solution that adapts to changing threats and business needs. The model's cloud-native architecture enables organizations to scale security services efficiently while maintaining consistent protection across all users, devices, and locations. The success of SASE implementation depends on the careful orchestration of all five layers working in harmony to deliver secure, optimized network access to users regardless of their location or device.
Network Layer
The Network Layer serves as the foundation of the SASE architecture, providing essential connectivity and optimization services through SD-WAN technology. This layer manages traffic routing, ensuring optimal path selection and quality of service across the entire network infrastructure. It continuously monitors network performance, making real-time adjustments to maintain optimal connectivity and application performance. The layer incorporates sophisticated bandwidth management capabilities, allowing organizations to prioritize critical applications and services. Advanced traffic optimization features help reduce latency and improve overall network efficiency, particularly crucial for organizations with distributed workforces and cloud-based resources.
Access Control Layer
The Access Control Layer represents the cornerstone of SASE's identity-driven security approach, implementing sophisticated authentication and authorization mechanisms. This layer integrates identity and access management (IAM) with multi-factor authentication (MFA) to ensure robust user verification. Zero Trust Network Access (ZTNA) principles are applied here, requiring continuous verification of every access attempt regardless of source or destination. Device posture checking is continuously performed to ensure only compliant and secure devices can access network resources. The layer also implements conditional access policies that adapt to real-time risk assessments and changing security contexts.
Security Services Layer
The Security Services Layer combines multiple security functions into a unified, cloud-delivered service that protects against various cyber threats. This critical layer incorporates Firewall as a Service (FWaaS), Secure Web Gateway (SWG), and Cloud Access Security Broker (CASB) capabilities to provide comprehensive security coverage. Advanced threat prevention and detection mechanisms actively monitor for and respond to potential security incidents. Data Loss Prevention (DLP) capabilities ensure sensitive information remains protected across all network communications. The layer also provides integrated threat intelligence and automated response capabilities to address emerging security challenges.
Policy Management Layer
The Policy Management Layer enables centralized control and consistent enforcement of security policies across the entire network infrastructure. This layer maintains a single source of truth for security policies, eliminating inconsistencies and gaps that could arise from distributed policy management. Real-time policy enforcement ensures immediate implementation of security controls and access restrictions based on current conditions and risk levels. Compliance monitoring capabilities help organizations maintain adherence to regulatory requirements and internal security standards. The layer also provides comprehensive audit logging and reporting capabilities to track policy effectiveness and demonstrate compliance.
Analytics and Visibility Layer
The Analytics and Visibility Layer provides crucial insights into network operations, security status, and user behavior patterns. This layer employs advanced security analytics and User and Entity Behavior Analytics (UEBA) to detect anomalies and potential security threats. Real-time monitoring and alerting capabilities enable rapid response to security incidents and performance issues. Integration with threat intelligence feeds enhances the organization's ability to identify and respond to emerging threats. Comprehensive reporting and visualization tools help organizations understand their security posture and make data-driven decisions.
Title: GartnorGroup’s Sassy Layers
Sources
Gartner Research (mentioned in multiple documents)
Introduced the SASE framework in 2019 report "The Future of Network Security Is in the Cloud"
Defines SASE as converging SD-WAN, cloud network, and Security Service Edge (SSE) functions
Projects 60% enterprise SASE adoption by 2025
Microsoft Security Documentation
Reference: microsoft.com/security/business/security-101/what-is-sase
Defines four main traits of SASE including identity-driven approach and cloud-native architecture
Details integration of SD-WAN with Zero Trust security solutions
Palo Alto Networks Cyberpedia
Reference: paloaltonetworks.com/cyberpedia/what-is-sase
Describes SASE as contemporary cybersecurity framework
Details integration with DLP and identity-based policies
Explains cloud-native security approach
Cato Networks Technical Documentation
Reference: catonetworks.com/sase/sase-architecture
Outlines SASE Cloud architecture characteristics
Emphasizes identity-driven security model
Details global distribution requirements
TechTarget Network Security Resources
Reference: techtarget.com/searchnetworking/definition/Secure-Access-Service-Edge-SASE
Explains SASE inspection engines and PoP architecture
Details integration of network and security functions
Cisco/Meraki Technical Documentation
Reference: meraki.cisco.com/what-is/sase
Emphasizes centralized policy control
Details unified visibility and management requirements
Netify Research
Reference: netify.com/learning/sase-vendor-comparison-features-and-evaluation-criteria
Provides detailed comparison of SASE features across vendors
Analyzes security component integration
These sources collectively validate the five-layer model of SASE architecture and provide comprehensive documentation of functionality across Network, Access Control, Security Services, Policy Management, and Analytics layers. Each source contributes unique perspectives on implementation requirements and architectural considerations within the SASE framework.