Design a security operations architecture that gives SIEM, XDR, audit, and automation systems the right signals, retention, ownership, and response boundaries.
Define outcomes before data sources
Start with detection and investigation use cases, then identify the telemetry required to support them. Collecting every event without a purpose increases cost and noise. For each source, define owner, schema, latency, retention, integrity, and failure monitoring.
Combine SIEM and XDR deliberately
Microsoft Sentinel correlates broad cloud, identity, network, and third-party telemetry. Microsoft Defender XDR provides product-native detection and investigation across supported security domains. Integrate them so incidents and context reinforce each other without creating duplicate response ownership.
Centralize audit evidence
Administrative and compliance events may require different retention and access controls from operational alerts. Include Microsoft Purview Audit where Microsoft 365 activities are in scope. Protect log workspaces, export paths, and collector identities from the same administrators being monitored.
Automate safe actions
Use SOAR for repeatable enrichment, notification, containment, and ticketing. Keep destructive or business-disruptive actions behind approval until accuracy is proven. Every playbook needs an identity, scoped permissions, error handling, and an audit trail.
| Decision | Key question |
|---|---|
| Ingest | Does this signal support a use case? |
| Retain | What investigation or compliance window applies? |
| Automate | Is the action reversible and sufficiently reliable? |
| Escalate | Who owns the affected business service? |