CV0-004 Troubleshooting Practice Question
Which THREE are common reasons why a cloud database instance may become unreachable?
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
✓
Firewall rules blocking the database port
The three most common reasons a cloud database instance becomes unreachable are firewall rules blocking the database port (A), an incorrect connection string in the application (B), and the database service not being started (D). A full storage volume (C) may cause write failures but does not always result in unreachability, and hypervisor maintenance (E) typically uses live migration to avoid downtime.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Firewall rules blocking the database port
Why this is correct
Security groups or firewalls can block inbound traffic.
- ✓
Incorrect connection string in the application
Why this is correct
Wrong host/port leads to no connection.
- ✗
Storage volume is full on the database server
Why it's wrong here
Full storage causes errors but not necessarily unreachable.
- ✓
Database service not started
Why this is correct
If the service is down, the port is not listening.
- ✗
Hypervisor maintenance causing VM reboot
Why it's wrong here
VMs are typically live-migrated, so no downtime.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CV0-004 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CV0-004 exam.