This CV0-004 practice question tests your understanding of deployment. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Users are unable to load a web page on a newly deployed web server. The security group for the server allows inbound HTTP from 0.0.0.0/0. The web service is running and listening on port 80. Which of the following is the MOST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The web server is listening on the wrong IP address.
Option D is correct because if the web server is listening on an IP address other than the one clients are reaching (e.g., 127.0.0.1 or a different private IP), inbound HTTP requests will not be processed even though the security group allows traffic on port 80. This is a common misconfiguration where the server binds to a loopback or incorrect interface, causing it to ignore external packets.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The DNS record for the domain is not yet propagated.
Why it's wrong here
DNS propagation would not affect direct IP access; the question does not mention a domain name.
✗
The VM's firewall is blocking inbound requests on port 80.
Why it's wrong here
The security group already allows HTTP; a local firewall would be unusual and is not the most likely cause.
✗
The load balancer target group is unhealthy.
Why it's wrong here
There is no load balancer mentioned in the deployment; this is a single server scenario.
✓
The web server is listening on the wrong IP address.
Why this is correct
A common misconfiguration is binding the web server to 127.0.0.1 or a private IP instead of the public-facing IP, causing external requests to fail.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between network-level security groups and OS-level firewall or binding configurations, trapping candidates who assume that allowing inbound traffic in the security group is sufficient for connectivity.
Trap categories for this question
Scenario analysis trap
There is no load balancer mentioned in the deployment; this is a single server scenario.
Detailed technical explanation
How to think about this question
Web servers like Apache or Nginx bind to specific IP addresses and ports via directives such as 'Listen 80' or 'server { listen 80; }'. If the server binds to 127.0.0.1:80, it will only accept connections from the local machine, not from external clients. In cloud environments, the security group controls network ACLs at the hypervisor level, but the OS-level socket binding is independent; a common troubleshooting step is to run 'netstat -tlnp' or 'ss -tlnp' to verify the listening address.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the CV0-004 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The web server is listening on the wrong IP address. — Option D is correct because if the web server is listening on an IP address other than the one clients are reaching (e.g., 127.0.0.1 or a different private IP), inbound HTTP requests will not be processed even though the security group allows traffic on port 80. This is a common misconfiguration where the server binds to a loopback or incorrect interface, causing it to ignore external packets.
What should I do if I get this CV0-004 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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