| Cost Component | Traditional (SD-WAN + point security) | SASE Converged |
|---|
| SD-WAN appliances | $1K-$10K per branch | Included or virtual |
| MPLS circuits | $500-$5K per site per month | Reduced (broadband-first) |
| SWG license | $5-$15/user/mo | Included |
| CASB license | $5-$15/user/mo | Included |
| ZTNA license | $8-$15/user/mo | Included |
| FWaaS | $3-$10/user/mo | Included |
| Central management | Multiple consoles | Single console |
| Staffing (3-yr) | 5-15 network/security engineers | 2-5 network/security engineers |
| 3-year TCO (1,000 users, 50 sites) | $1.5M-$3M | $1.2M-$2.5M |
Source: Gartner TCO analysis for SASE, 2026.
When to choose SASE
Choose SASE when operational simplicity, cloud-native security, and global edge performance drive the decision. SASE reduces vendor sprawl, simplifies policy management, and delivers security closer to users regardless of location. For cloud-first enterprises with distributed workforces, SASE is the modern architecture.
When to choose standalone SD-WAN
Choose standalone SD-WAN when you need branch networking with existing on-premises security, regulatory constraints, or a clear path to SASE later. Modern SD-WAN from Cisco, Fortinet, Versa, or VMware/Broadcom integrates with SASE providers, so the path to convergence is straightforward.
Internal links
See related SASE and networking guides: SASE implementation cost, SD-WAN cost comparison, and Zero Trust cost.
Alternatives to consider
If neither contender in this comparison fits, these adjacent options are worth a look:
- Premium tier (when both candidates are mid-tier and you want the flagship experience).
- Budget tier (when you'd use the cheapest viable alternative anyway).
- Niche alternative (when one specific dimension — battery, ecosystem, weight — dominates your decision).
FAQs
See FAQ section above for SASE definition, SD-WAN vs SASE relationship, vendor comparison, pricing benchmarks, and TCO analysis.
SASE migration phases for global enterprises
Global enterprises typically migrate to SASE in 3 phases over 18-24 months. Skipping phases creates performance and security gaps.
| Phase | Duration | Activities |
|---|
| 1. SWG Migration (ZIA) | 3-6 months | Replace legacy proxies with cloud SWG |
| 2. Private Access (ZPA) | 3-9 months | Replace VPN with ZTNA for private apps |
| 3. CASB + FWaaS | 3-9 months | SaaS security inspection, cloud firewall |
| 4. Branch SD-WAN | 6-12 months | Replace branch MPLS / VPN routers |
| 5. Optimization | Ongoing | Performance tuning, user experience monitoring |
Source: Zscaler and Palo Alto SASE deployment methodology, 2026.
FAQ expansion
Q: Can I deploy SASE without replacing my SD-WAN? Yes. SASE and SD-WAN are complementary. You can deploy SASE cloud security while keeping existing SD-WAN for branch connectivity. Most enterprises migrate SD-WAN separately on its own schedule.
Q: How does SASE handle compliance and data residency? Major SASE vendors (Zscaler, Netskope, Palo Alto Prisma) operate data centers in 100+ countries to support data residency requirements. Pin traffic to specific regions for compliance-sensitive workloads. Verify the vendor's data center locations and contractual data residency commitments before deployment.
Q: What is the typical TCO reduction from SASE? Most enterprises report 20-40 percent TCO reduction from SASE consolidation over 3 years compared to running separate SD-WAN, SWG, CASB, ZTNA, and FWaaS products. Savings come from reduced vendor sprawl, lower bandwidth costs (local internet breakout), and reduced staffing complexity.
For most enterprises, SASE adoption starts with branch SD-WAN replacement and ZIA/ZPA migration. Pure-play SD-WAN vendors like Cato Networks and Versa Networks target this migration path with integrated SASE stacks. Traditional SD-WAN leaders (Cisco, Fortinet, VMware) have added SASE capabilities through organic development and acquisitions.
Most enterprises complete SASE migration in 18-36 months depending on global footprint and existing infrastructure. Schedule drivers include legacy MPLS contract terms, branch hardware refresh cycles, and cloud application usage patterns. Plan for at least one full year of parallel operations during the migration window.
Fazlur Rahman
