Cheat sheet & self-check

Pick an answer to see if you got it, and why.

1. Q1. What belongs in an Architecture Decision Record?

   1. AOnly the final diagram
   2. BThe context, the options considered, the decision, and its consequences and trade-offs
   3. CThe Terraform code
   4. DA list of team members
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   B. An ADR captures why a choice was made, so future engineers can revisit it when the context changes instead of guessing.

   From lesson 16 · Architecture & design review

2. Q2. A reviewer asks, 'What happens when an AZ fails?' What's the strongest answer?

   1. AAWS handles it
   2. BNodes and replicas are spread across three AZs with topology spread and PDBs, NAT is per AZ, storage is AZ-aware, and we've tested an AZ drain
   3. CWe have backups
   4. DWe use a big instance type
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   B. Reviewers want the mechanism and the evidence: spread, per-AZ dependencies, stateful-data behaviour, and a tested drill.

   From lesson 16 · Architecture & design review

3. Q3. Many small clusters or a few large ones?

   1. AAlways many small
   2. BIt depends: hard isolation and different compliance or upgrade needs favour more clusters; operating cost and efficiency favour fewer, with strong multi-tenancy
   3. CAlways one
   4. DAlways one per team
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   B. The right answer names the drivers and the costs of each side, then picks based on the organisation's constraints.

   From lesson 16 · Architecture & design review