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32 multiple-choice questions and 19 flashcards on Reliability and Business Continuity, about 18% of the AWS Certified CloudOps Engineer SOA-C03 bank. Every one carries a written rationale.
Reliability and Business Continuity is one of 5 chapters in CoStudy's AWS Certified CloudOps Engineer — Associate (SOA-C03) bank, and it holds 32 of the bank's 174 multiple-choice questions — roughly 18% of the total. That proportion is not arbitrary: chapters follow the certifying body's published exam outline, and the number of questions in each is set by that domain's published weight, so the share of your practice time this chapter takes matches the share of the real exam it accounts for.
Studying by chapter is worth doing once you have a diagnostic score. A single overall percentage tells you whether you are close; it does not tell you which domain is dragging. Working a weak chapter in isolation, and re-testing it in isolation, is the fastest way to move a score that has stalled — and it is why the mock exams in CoStudy report by domain rather than as one number.
2 questions drawn from this chapter, with the full rationale shown — the controlling principle behind the right answer, and why each wrong option tempts and fails.
An RDS deployment must survive an AZ failure with automatic failover in the same region and no application-driven read-replica promotion logic.
Answer: A — Enable Multi-AZ deployment with a synchronous standby in a second AZ
A) Correct — Multi-AZ maintains a synchronous standby; RDS automates DNS failover. B) Read replicas are async and require manual promotion. C) Global Database targets multi-region DR, overkill for single-AZ failure. D) EBS Multi-Attach is single-AZ only.
A batch workload must survive Spot interruptions gracefully by checkpointing progress and resuming on a fresh instance when a two-minute notice arrives.
Answer: C — Handle EC2 Spot interruption notices via IMDS and checkpoint state to S3 before shutdown
A) Direction reversal — eliminates the requirement instead of meeting it. B) Lifecycle hooks can't pause Spot terminations. C) Correct — the 2-minute Spot notice via IMDS is the checkpoint trigger. D) Auto Recovery doesn't apply to Spot terminations.
4 cards from the 19 in this chapter.
S3 replication types?
Cross-Region (CRR) and Same-Region (SRR). Async, requires versioning.
ELB health checks?
Monitor backend instances. Unhealthy instances removed from rotation.
AWS Backup vault lock?
WORM enforcement. Prevents deletion (compliance/ransomware protection).
Multi-Region deployment?
Disaster recovery beyond region. Higher cost, complexity. Use Route 53 for failover.
These are a sample. The full Reliability and Business Continuity chapter runs 51 items with per-chapter progress tracking, on the web and in the iOS app.
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