The answer is that the httpd service is masked, which prevents it from starting at boot even after being enabled. A masked service in systemd is symlinked to /dev/null, effectively creating a permanent block that overrides any enable command; when you run systemctl enable httpd, systemd creates the expected startup symlinks, but the mask directive takes precedence and tells systemd to ignore the unit entirely. On the CompTIA Linux+ XK0-005 exam, this scenario tests your understanding of the distinction between enabling a service and masking it—a common trap is assuming enable alone guarantees boot-time startup, but a mask silently overrides it. To troubleshoot a systemd service masked not starting after enable, always check with systemctl list-unit-files or systemctl is-enabled to spot the masked status. Remember the mnemonic: “Mask blocks, enable links—if it’s masked, the service sinks.”
XK0-005 System Management Practice Question
This XK0-005 practice question tests your understanding of system management. 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.
An administrator configures a new web server with Apache and needs to ensure it starts automatically after a system reboot. The administrator runs 'systemctl enable httpd' but the service still does not start after reboot. What is the most likely reason?
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 httpd service is masked, preventing it from starting.
The most likely reason the httpd service does not start after reboot despite being enabled is that it is masked. A masked service is symlinked to /dev/null, which prevents systemd from starting it even if it is enabled. The 'systemctl enable' command creates the necessary symlinks for automatic startup, but a mask overrides this by blocking the service unit entirely.
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 service name is incorrect; it should be 'apache2' instead of 'httpd'.
Why it's wrong here
httpd is correct for RHEL/CentOS; the name varies by distribution but the question assumes correct name.
✗
The administrator forgot to run 'systemctl start httpd' after enabling it.
Why it's wrong here
Enable is for boot-time; start is for immediate start; but the service should start at boot if enabled.
✓
The httpd service is masked, preventing it from starting.
Why this is correct
A masked service cannot be started; check with 'systemctl is-enabled httpd'.
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.
✗
The systemd daemon needs to be reloaded with 'systemctl daemon-reload'.
Why it's wrong here
Daemon-reload is needed after unit file changes, not after enable.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'enabled' with 'started' and assume the service must be started manually after enabling, overlooking the more subtle masking mechanism that prevents automatic startup despite the enable state.
Detailed technical explanation
How to think about this question
When a service is masked, systemd creates a symlink from the unit file (e.g., /usr/lib/systemd/system/httpd.service) to /dev/null, making the unit completely unavailable. This can be checked with 'systemctl list-unit-files | grep httpd' which would show 'masked' status. In real-world scenarios, masking is often used to prevent conflicting services (e.g., masking firewalld when using iptables) or to disable services that are pulled in as dependencies.
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this XK0-005 question in full detail.
System Management — This question tests System Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The httpd service is masked, preventing it from starting. — The most likely reason the httpd service does not start after reboot despite being enabled is that it is masked. A masked service is symlinked to /dev/null, which prevents systemd from starting it even if it is enabled. The 'systemctl enable' command creates the necessary symlinks for automatic startup, but a mask overrides this by blocking the service unit entirely.
What should I do if I get this XK0-005 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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