Domain 4 · 20% of Exam

Accelerate Workload Migration and Modernization

Domain 4 covers migration assessment, planning, execution, cutover, modernization, and choosing AWS services that reduce migration risk.

What You'll Be Tested On

  • Assessing application portfolios and selecting migration strategies such as rehost, replatform, repurchase, refactor, retain, retire, and relocate
  • Planning migration waves, landing zones, network connectivity, identity, security, and operational readiness
  • Migrating servers with AWS Application Migration Service and databases with AWS DMS and SCT
  • Modernizing workloads with managed databases, containers, serverless services, event-driven architecture, and automation
  • Executing cutover, rollback, validation, replication, and post-migration optimization

Key AWS Services in This Domain

Exam Tips for Domain 4

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Rehost is fastest, replatform improves selected layers, and refactor changes architecture for cloud-native benefits.

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Use Application Migration Service for lift-and-shift server migration with continuous replication.

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Use DMS for database migration and SCT when schema conversion is needed.

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Modernization questions often favor managed services when they reduce operations and improve scalability.

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