As workforces became mobile and applications moved to the cloud, backhauling traffic to a central data center for inspection became a bottleneck. SASE converges SD-WAN and network security (SWG, CASB, FWaaS, ZTNA) into a single, cloud-delivered service.
SASE routes user traffic to the nearest global Point of Presence (PoP). Security policies are enforced at the edge, providing low-latency, secure access to SaaS applications and internal resources without the backhaul penalty.
💡 Pro-tip: SASE is heavily reliant on identity. The user's identity (not their IP address) becomes the primary perimeter, allowing policies to follow the user whether they are at home, a cafe, or the office.
{
"policy": "Allow_Sales_SaaS",
"identity": "group:Sales",
"destination": "Salesforce",
"inspection": "CASB_DLP_Enabled"
}This JSON policy illustrates a SASE rule: it grants the Sales group access to Salesforce while enforcing Data Loss Prevention (DLP) inspection at the cloud edge.
SASE integrates Secure Web Gateways (SWG) for URL filtering, Cloud Access Security Brokers (CASB) for SaaS visibility, Firewall-as-a-Service (FWaaS) for traffic control, and ZTNA for private app access.
⚠️ Migrating to SASE requires rethinking routing. You must abandon hub-and-spoke MPLS topologies in favor of direct internet breakouts at branch offices, secured by the cloud SASE PoPs.
| Component | Function | Replaces |
|---|---|---|
| SD-WAN | Intelligent Routing | MPLS / Static Tunnels |
| SWG | Web Filtering | On-prem Proxy |
| CASB | SaaS Control | Manual API audits |
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