The answer is a misconfigured DNS resolver on the failing servers. When a configuration management agent like Chef or Puppet cannot resolve the hostname of the management server, it will fail to establish a connection, resulting in the observed timeouts. This explains why only a subset of servers is affected—those with broken DNS settings—while others in the same subnet and security group work fine, ruling out network-level or firewall issues. On the CompTIA Cloud+ CV0-004 exam, this scenario tests your ability to isolate DNS-related connectivity problems from broader infrastructure faults; a common trap is to assume a security group or certificate problem when the issue is actually hostname resolution. Remember the mnemonic “DNS before DNS” — always verify Domain Name System resolution before diving into deeper network diagnostics.
CV0-004 Operations and Support Practice Question
This CV0-004 practice question tests your understanding of operations and support. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A cloud operations team uses a configuration management tool (e.g., Chef, Puppet) to manage a fleet of Linux servers in a public cloud. After a recent update, the team notices that some servers are failing to apply the new configuration. The logs on the failing servers show connection timeouts to the configuration management server. Other servers in the same subnet and security group apply configurations successfully. The configuration management server is reachable from the admin's workstation. Which of the following is the MOST likely cause of the issue?
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 failing servers have a misconfigured DNS resolver.
Option A is correct because a misconfigured DNS resolver on the failing servers can cause hostname resolution failures, leading to connection timeouts to the configuration management server. Option B is wrong because all servers share the same security group, so firewall rules are identical. Option C is wrong because if the certificate had expired, all servers would be affected, not just a few. Option D is wrong because if the agent were missing, the logs would show agent-related errors, not connection timeouts.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 failing servers are missing the configuration management agent.
Why it's wrong here
Missing agent logs would show agent not found or not running, not connection timeouts.
✗
The configuration management server certificate has expired.
Why it's wrong here
An expired certificate would cause SSL errors, not just timeouts, and would affect all servers.
✗
The failing servers have a firewall rule blocking outbound connections.
Why it's wrong here
Since other servers in the same subnet and security group work, firewall rules are not the issue.
✓
The failing servers have a misconfigured DNS resolver.
Why this is correct
DNS misconfiguration prevents the server from resolving the configuration management server's hostname, causing timeouts.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Trap categories for this question
Command / output trap
Missing agent logs would show agent not found or not running, not connection timeouts.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related CV0-004 subnetting questions on CIDR, address ranges, and subnet selection.
Operations and Support — This question tests Operations and Support — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: The failing servers have a misconfigured DNS resolver. — Option A is correct because a misconfigured DNS resolver on the failing servers can cause hostname resolution failures, leading to connection timeouts to the configuration management server. Option B is wrong because all servers share the same security group, so firewall rules are identical. Option C is wrong because if the certificate had expired, all servers would be affected, not just a few. Option D is wrong because if the agent were missing, the logs would show agent-related errors, not connection timeouts.
What should I do if I get this CV0-004 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related CV0-004 subnetting questions on CIDR, address ranges, and subnet selection.
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?
CIDR notation defines the prefix length.
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