From SD-WAN to SASE: A comparative analysis of network architecture evolution

Arumugam, Venkatasubramani (2025) From SD-WAN to SASE: A comparative analysis of network architecture evolution. World Journal of Advanced Engineering Technology and Sciences, 15 (3). pp. 1909-1915. ISSN 2582-8266

The rapid evolution of enterprise network architectures has necessitated a fundamental shift from traditional hub-and-spoke WAN models to more sophisticated Software-Defined Wide Area Networking and Secure Access Service Edge frameworks. Contemporary organizations face unprecedented challenges in accommodating distributed workforces, cloud-native applications, and edge computing requirements while maintaining robust security postures across diverse network environments. Software-Defined WAN technology addresses connectivity optimization through intelligent path selection, centralized policy management, and application-aware routing capabilities that enhance network performance and reduce operational complexity. Secure Access Service Edge architecture represents a convergence of networking and security functions into unified cloud-native platforms that integrate Zero Trust principles, Cloud Access Security Broker functionality, Firewall as a Service, and Zero Trust Network Access capabilities. The implementation of Zero Trust methodologies fundamentally transforms cybersecurity approaches by establishing continuous verification frameworks that evaluate user identity, device integrity, and contextual factors for every access request. Comparative evaluation reveals distinct value propositions between SD-WAN and SASE implementations across security capabilities, operational complexity, scalability characteristics, and total cost of ownership considerations. Organizations must carefully evaluate specific business requirements, existing infrastructure investments, and strategic objectives when determining optimal network architecture approaches that balance performance optimization with comprehensive security coverage.