Question 45 of 977
CV0-004 Troubleshooting Practice Question
A cloud database cluster is experiencing replication lag. The primary node shows high write activity, and the replicas are on different availability zones. Which of the following is the most likely cause?
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
✓
Network latency between the primary and replica zones is high.
Network latency between availability zones is a common cause of replication lag in asynchronous replication setups, especially when the primary has high write activity. Option A is incorrect because synchronous replication would cause the primary to wait for acknowledgment from replicas, leading to write slowdown rather than lag on replicas. Option C is incorrect because insufficient storage on replicas would typically cause disk-full errors, not replication lag. Option D is incorrect because vCPU over-allocation on the primary primarily affects compute performance, not the replication process which is more sensitive to network and disk I/O.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Replication is configured as synchronous.
Why it's wrong here
Synchronous would slow primary but not cause lag.
- ✓
Network latency between the primary and replica zones is high.
Why this is correct
Geographic distance increases latency, causing replication lag.
- ✗
The replica nodes have insufficient storage.
Why it's wrong here
Storage would cause errors, not lag.
- ✗
The primary node's vCPU is over-allocated.
Why it's wrong here
High write activity is expected; CPU might be fine.
Visual reference
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Last reviewed: Jun 24, 2026
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