hardMultiple SelectObjective-mapped
CV0-004 Practice Question: A cloud administrator is troubleshooting an…
A cloud administrator is troubleshooting an application that fails to connect to a database. The application and database are in the same VPC. Which THREE steps should the administrator take to diagnose the issue?
⚠ Common exam trap
CompTIA often tests the distinction between stateful security groups and stateless network ACLs, and candidates mistakenly assume that allowing inbound traffic in the security group alone is sufficient, forgetting that network ACLs must also permit the traffic.
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
✓
Test connectivity to the database using a telnet or netcat command from the application server.
Telnet or netcat can test basic TCP connectivity to the database port, confirming whether the database is reachable from the application server at the network layer. This step isolates whether the issue is a network connectivity problem versus an authentication or configuration issue within the database itself.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Check the routing table for a route to the internet.
Why it's wrong here
No internet access needed for internal communication.
- ✓
Test connectivity to the database using a telnet or netcat command from the application server.
Why this is correct
Direct connectivity test isolates the issue.
- ✓
Verify that the security group associated with the database instance allows inbound traffic from the application's security group on the database port.
Why this is correct
Security groups control traffic to the database.
- ✗
Check the DNS resolution of the database endpoint in the application's subnet.
Why it's wrong here
DNS is unlikely to be the issue in same VPC.
- ✓
Verify that the network ACL for the database subnet allows inbound traffic on the database port.
Why this is correct
Network ACLs are stateless and must allow traffic.
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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.