Secure Access Service Edge

What Is SASE?

Secure Access Service Edge (SASE, pronounced "sassy") is a framework defined by Gartner that merges networking and security into a unified cloud service. Instead of backhauling traffic through a central data center for security inspection, SASE delivers security at the edge — close to users, devices, and applications wherever they are.

SASE Components

SASE combines several previously separate capabilities:

| Component | Full Name | Function | |---|---|---| | SD-WAN | Software-Defined Wide Area Network | Intelligent traffic routing across WAN links | | SWG | Secure Web Gateway | Web filtering, malware inspection, URL categorization | | CASB | Cloud Access Security Broker | Visibility and control over SaaS application usage | | ZTNA | Zero Trust Network Access | Identity-based application access (replaces VPN) | | FWaaS | Firewall as a Service | Cloud-delivered firewall policies |

Why SASE?

The shift to remote work, cloud applications, and distributed workforces broke the traditional network perimeter model. SASE addresses this by:

• Reducing latency — Security inspection happens at the nearest edge PoP, not a distant data center
• Simplifying management — One platform replaces multiple point products
• Enabling zero trust — Access decisions based on identity, device posture, and context
• Scaling elastically — Cloud-delivered capacity grows with demand
• Reducing costs — Consolidate MPLS, VPN, firewall, and proxy into one service

Single-Vendor vs. Multi-Vendor SASE

• Single-vendor SASE: One platform for all components. Simpler operations, tighter integration. Examples: Zscaler, Cato Networks, Netskope.
• Multi-vendor SASE: Best-of-breed SD-WAN combined with a separate SSE (Security Service Edge) provider. More flexibility, more integration work.

Evaluating SASE Solutions

Key criteria:

1. Global PoP coverage — Number and location of edge points of presence
2. SSE completeness — Maturity of SWG, CASB, ZTNA, and DLP capabilities
3. SD-WAN integration — Native or partnered SD-WAN capability
4. User experience — Latency impact, client agent quality
5. API and integration — Compatibility with existing identity, SIEM, and endpoint tools

Leading SASE Vendors

Major SASE providers include Zscaler, Netskope, Palo Alto Prisma Access, Cato Networks, Cisco Secure Access, Fortinet FortiSASE, iboss, and Skyhigh Security.