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 company uses an automated patching solution that reboots instances after applying patches. After a recent patching cycle, several web servers failed to rejoin the load balancer pool. The administrator checks the application logs and finds that the web service failed to start because a required dependency was removed during patching. Which of the following should the administrator implement to prevent this issue in the future?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a pre-patch health check and verify critical dependencies.
Option D is correct because implementing a pre-patch health check that verifies critical dependencies ensures that the patching process does not remove or break required components. This proactive validation can detect missing dependencies before the reboot, allowing the administrator to remediate or halt the patching cycle, preventing the web service from failing to start.
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.
✗
Require manual approval before each patching operation.
Why it's wrong here
Manual approval adds overhead but does not automate dependency checks.
✗
Increase the patching frequency to reduce the number of patches per cycle.
Why it's wrong here
More frequent patches do not address dependency verification.
✗
Implement a rolling update strategy for the web servers.
Why it's wrong here
Rolling updates handle deployment, not dependency verification during patching.
✓
Configure a pre-patch health check and verify critical dependencies.
Why this is correct
Pre-patch checks can validate that required services and dependencies are present and functional.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse operational strategies like rolling updates (which maintain availability during updates) with dependency validation, failing to recognize that rolling updates do not prevent the underlying dependency removal issue that causes the service to fail after reboot.
Detailed technical explanation
How to think about this question
In automated patching solutions like AWS Systems Manager Patch Manager or Azure Update Management, pre-patch scripts can be configured to run dependency checks using tools like `dpkg --verify` on Debian-based systems or `rpm -Va` on Red Hat-based systems. These scripts can validate that required packages (e.g., Apache HTTP Server dependencies like `libapr1`) are present and not marked for removal, and if a critical dependency is missing, the script can fail the patching operation or trigger a notification. This approach aligns with the principle of 'fail fast' to avoid post-reboot failures that impact load balancer health checks.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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.
Operations and Support — This question tests Operations and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure a pre-patch health check and verify critical dependencies. — Option D is correct because implementing a pre-patch health check that verifies critical dependencies ensures that the patching process does not remove or break required components. This proactive validation can detect missing dependencies before the reboot, allowing the administrator to remediate or halt the patching cycle, preventing the web service from failing to start.
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.
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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