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The adoption of software-defined wide-area network (SD-WAN) technology offers clear cost and flexibility advantages for enterprises with large, distributed branch networks. In this report Zscaler explains how it approaches the SD-WAN security challenge.


  • Ovum has been investigating how SD-WAN providers are providing security to underpin their offerings. We find three distinct groups of vendors converging in this market.

Features and Benefits

  • Explains why WAN optimization vendors are getting into SD-WAN.
  • Explains how some security vendors compete head-on with SD-WAN providers while others complement their offerings.

Key questions answered

  • Does Zscaler compete in SD-WAN?
  • How does Zscaler deliver security to branch offices in an SD-WAN scenario?

Table of contents

Ovum view

  • Summary
  • Security as an add-on versus an all-in-one box
  • Most SD-WAN providers can send traffic to Zscaler
  • Cloud offers scalable compute and central updating
  • SD-WAN routers forward traffic to Zscaler through tunnels


  • Further reading
  • Author