Module 20 · SD-WAN and SASE Architecture

Manish Garg
Manish Garg Associate of (ISC)² · RingSafe
May 14, 2026
3 min read
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Why this module exists. SD-WAN and SASE (Secure Access Service Edge) are the modern WAN architectures replacing MPLS for distributed enterprises. They consolidate networking and security into cloud-delivered platforms. This module covers the architecture and the security considerations.

The traditional WAN vs SD-WAN

Traditional SD-WAN
MPLS private circuits Internet underlay with overlay tunnels
All branches → HQ → internet Local internet break-out at branches
Static routing Dynamic policy-driven path selection
High cost per Mbps Internet-economics pricing
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