What is SASE vs SSE?
Secure Access Service Edge vs Security Service Edge
The distinction between full SASE (SD-WAN + security) and SSE (security services only), which determines scope, cost, and deployment complexity.
SASE and SSE are not competing architectures — SSE is a subset of SASE. The confusion stems from vendors selling SSE-only solutions under the SASE brand. SASE includes both the networking layer (SD-WAN with path selection, QoS, and transport abstraction) and the security layer (SWG, CASB, ZTNA, FWaaS, DLP). SSE delivers only the security layer, leaving WAN management to existing infrastructure.
The practical decision: if you have existing SD-WAN (Viptela, VeloCloud, Silver Peak) or functioning MPLS that doesn't need replacing, SSE is sufficient. If you're building greenfield branches or your WAN costs are unsustainable, full SASE with integrated SD-WAN makes sense. The price difference is significant — SSE typically runs $8–18 per user/month while full SASE with SD-WAN licensing can reach $25–45 per user/month.
The most common mistake is buying full SASE when you only need SSE. The second most common is buying SSE and discovering six months later that you need SD-WAN integration but your SSE vendor's SD-WAN is immature or non-existent.
A cloud-delivered architecture that converges SD-WAN and security services (SWG, CASB, ZTNA, FWaaS) into a single, globally distributed platform.
The security half of SASE, delivering SWG, CASB, ZTNA, and DLP as cloud-delivered services without the SD-WAN networking component.
A virtualized WAN architecture that abstracts transport links (MPLS, broadband, LTE/5G) and uses software-based policy to select the optimal path for each application.
A cloud or on-premises proxy that inspects all web-bound traffic for malware, enforces URL filtering policies, and prevents data exfiltration over HTTP/HTTPS.
A security control point between users and SaaS applications that provides visibility into shadow IT, enforces data protection policies, and detects threats across cloud services.
An access model that grants users connectivity to specific applications, not networks, based on identity and device posture, verified continuously per session.
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