DBS-C01 Monitoring and Troubleshooting Practice Question
Network Topology
Refer to the exhibit. A database specialist is investigating an application outage that occurred at 14:25 UTC. The RDS event log shows the events above. What is the most likely cause of the outage?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A Multi-AZ failover occurred at 14:25 UTC, causing a brief outage.
The RDS event log shows 'Multi-AZ failover completed' at 14:25 UTC, which would cause a brief outage during the DNS switchover. The subsequent restart at 14:30 UTC is likely a result of the failover (e.g., instance recovery). Option A is wrong because there is no event indicating a maintenance window. Option B is wrong because storage-full events would show before the outage, not a failover event. Option D is wrong because a manual reboot would not show a Multi-AZ failover event; the restart at 14:30 is after the failover.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A maintenance window update was applied, causing the instance to become unavailable.
Why it's wrong here
No maintenance event is shown.
- ✗
The DB instance ran out of storage and became read-only.
Why it's wrong here
No storage-related event is shown.
- ✓
A Multi-AZ failover occurred at 14:25 UTC, causing a brief outage.
Why this is correct
Failover involves promoting the standby, which causes a momentary outage.
- ✗
The DB instance restarted at 14:30 UTC due to a manual reboot.
Why it's wrong here
The restart happened after the failover, likely due to the failover itself.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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