SD-WAN Architectures
Not all SD-WANs are built the same. The architecture behind your SD-WAN deployment has a major impact on performance, scalability, security, and cloud readiness.
In this lesson, we’ll explore four common SD-WAN architectural models in use today, plus a fifth model that blends the best of each into a next-generation global design. Understanding the differences will help you select the right approach for your business—based on geography, cloud usage, and security needs.
1. PoP-Based Architecture – Proximity to performance
This architecture leverages a distributed network of Points-of-Presence (PoPs) to bring network and security services closer to users, branch offices, and cloud entry points.
Key characteristics:
- PoPs act as regional hubs for policy enforcement, optimization, and routing
- User traffic is steered to the nearest PoP
- PoPs are interconnected via high-speed backbone links
- Ideal for globally distributed organizations
Overview: By placing intelligence closer to users, PoP-based SD-WAN reduces latency, enhances SaaS/cloud access, and simplifies regional management—all while maintaining central visibility and control. However, less sophisticated PoP transport architectures may be incapable of supporting the mix of networking and security services required for today’s modern network.
2. Public Cloud-Based Overlay Architecture – Cloud-native, but variable
This model hosts SD-WAN controllers and gateways in public cloud environments like AWS, Azure, or GCP. It’s ideal for cloud-first organizations that prioritize agility and scalability.
Key characteristics:
- SD-WAN functions are delivered via cloud-hosted VMs
- Routing happens over the internet (public underlay)
- Integrates well with IaaS and cloud-native workloads
- Regional performance varies based on cloud presence
Overview: It’s highly scalable and easy to deploy, but performance depends heavily on the quality of the public internet and proximity to cloud regions. Not ideal for latency-sensitive or global real-time workloads.
3. Network Transit Hub Architecture – A centralized control point
Here, SD-WAN branches connect to one or more centralized hubs that manage routing, security, and cloud access.
Key characteristics:
- Acts as a bridge between branch traffic and cloud/data center resources
- Allows centralized policy enforcement
- Suitable for organizations with fewer, large hubs
- Works well for regional breakouts
Overview: This “hub-and-spoke” approach simplifies routing and security but can introduce latency and bottlenecks when cloud access is backhauled through hubs.
4. SD-Core Architecture – A distributed network and security fabric
This model unifies the network and security stack in a globally distributed fabric—often purpose-built by the SD-WAN provider—to deliver SASE-ready infrastructure.
Key characteristics:
- Combines backbone transport, security, optimization, and orchestration
- Globally distributed and highly available
- Centralized control with local enforcement
- Supports dynamic routing and full mesh site connectivity
Overview: While SD Core improves middle mile reliability compared to the public internet, it typically lacks integrated end to end SD WAN capabilities—such as built in WAN optimization, direct SaaS and cloud onramps, and unified management—often requiring additional vendors and complexity to deliver a complete solution.
5. The Aryaka Difference – Beyond a topology—an integrated platform
Aryaka’s SD-WAN architectures uniquely blends multiple models into a global PoP-based, cloud-first, security-integrated platform. It includes:
- A Layer 2 global private backbone interconnecting 40+ PoPs
- Built-in WAN optimization and application acceleration
- Integrated security through OnePASS™ and Zero Trust WAN
- Observability and automation via MyAryaka and AI>Perform
Why it’s different: Aryaka combines the predictability of a private core, the agility of a cloud-native overlay, and the reach of a PoP-centric design—offering the best of all worlds in a single, flexible solution.