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1Z0-1123-25 Cheatsheet — OCI Migration Architect (Connectivity, Cutover, Validation)

Last-mile 1Z0-1123-25 review: migration phases, connectivity pickers (VPN/FastConnect), cutover decision tables, validation checklist, and rollback planning.

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Use this for last‑mile review. Pair it with the Syllabus.

1) Migration phases (exam framing)

Assess → design landing zone → migrate data → migrate apps → validate → cut over → stabilize.

High-yield reminders:

  • Always map dependencies (identity, DNS, networking, secrets, monitoring).
  • Always define RPO/RTO and downtime windows before choosing tools.

2) Connectivity picker

RequirementPrefer
Fast setup / lower costIPSec VPN
Higher bandwidth / predictable latencyFastConnect
Multiple VCN routing hubDRG-based hub

3) Cutover strategy picker (concept-level)

ConstraintPrefer
Can tolerate downtimeoffline cutover (simpler)
Minimal downtimeonline migration/replication + controlled switchover

Always include:

  • data validation
  • rollback trigger
  • communication plan

4) Validation checklist (what correct answers include)

  • Data correctness (counts/checksums/spot checks)
  • App behavior (smoke tests and critical workflows)
  • Observability (alarms/dashboards/log routing)
  • Security controls (IAM, network rules, secrets rotation)
Syllabus
Practice