Purchase this item and get Description
For learners studying for CompTIA Linux+ XK0-006 (V8)
What you'll learn
Practice pack content
Domain 1 - System Management
Domain 2 – Services and User Management
Domain 3 – Security
Domain 4 – Automation, Orchestration, and Scripting
Domain 5 – Troubleshooting
Final Exam Simulators
Exam Study Guide
Interactive Flashcards
Try 3 Linux+ XK0-006 (V8) practice questions
Choose an answer, explore the explanation, and see why the other options are less suitable. Three short scenarios. No sign-in required.
1. Querying DNS directly
A Linux administrator is troubleshooting name resolution on a production server. The administrator wants to query DNS directly for the A record of a hostname and review the returned question, answer, and server information without testing application traffic. Which command is most appropriate?
Answer and full explanation
Correct answer: B — dig.
Why B is correct
dig is a DNS query tool that can request specific record types and display the response returned by a resolver or name server. The scenario specifically requires querying an A record and examining DNS response information rather than testing general connectivity. CompTIA lists dig among the common network tools in Objective 1.4. ISC documentation also demonstrates dig issuing an A-record query and displaying the DNS question and answer sections. It is therefore the most direct tool for the stated diagnostic task.
Why the other options are less suitable
- A — arp:
arpworks with address-resolution information that maps IP addresses to link-layer addresses on the local network. It does not query DNS records for a hostname. - C — iperf3:
iperf3measures network throughput between participating endpoints. It can help investigate performance, but it does not retrieve DNS A records or show DNS response sections. - D — ss:
ssdisplays socket and connection information on a Linux system. It is useful for examining listening or established sockets, not for directly querying a DNS name server.
Key takeaway: Use dig when you need to query DNS records and inspect the returned DNS response.
Read two more sample questions
2. Temporary SSH firewall access
An administrator using firewalld needs to allow SSH through the current zone for exactly 15 minutes during remote maintenance. The rule should automatically revert and must not be written to the permanent configuration. Which command best meets the requirement?
Answer and full explanation
Correct answer: C — firewall-cmd --add-service=ssh --timeout=15m.
Why C is correct
Without --permanent, firewall-cmd changes the runtime firewall configuration. The --timeout=15m option causes the temporary change to revert automatically after 15 minutes. Red Hat documents this exact pattern for temporarily adding SSH service access and notes that timeout-based changes cannot be combined with --permanent. CompTIA Objective 3.2 explicitly includes firewalld, runtime versus permanent configuration, ports, and services. This command therefore satisfies both the temporary-access and automatic-reversion requirements.
Why the other options are less suitable
- A — Permanent SSH rule: This writes the service allowance to the permanent configuration rather than creating the requested temporary maintenance window. It also does not automatically remove SSH access after 15 minutes.
- B — Runtime SSH rule without timeout: This changes only runtime configuration, which is closer to the requirement. However, it remains active until another change, reload, or restart rather than automatically expiring after 15 minutes.
- D — Permanent rule with timeout: A timeout is intended for temporary runtime changes and cannot be combined with the permanent option in the documented firewalld workflow. It therefore conflicts with both the command behavior and the scenario's requirement.
Key takeaway: In firewalld, runtime rules can use a timeout for temporary access without changing the permanent configuration.
3. Free disk space but no new files
An application fails when creating new files and reports “No space left on device.” The affected filesystem shows substantial free capacity with df -h, but df -i reports 100% inode usage. What is the most likely cause?
Answer and full explanation
Correct answer: A — Inode exhaustion.
Why A is correct
A filesystem needs a free inode to create a new file even when data blocks are still available. The key evidence is that df -h shows free storage capacity while df -i reports that all inodes are used. CompTIA explicitly lists inode exhaustion as a Linux OS and storage issue in Objective 5.2. The GNU df manual confirms that the -i option reports inode information instead of block usage. The application can therefore run out of file entries before it runs out of ordinary disk capacity.
Why the other options are less suitable
- B — Block-space exhaustion: If filesystem data blocks were exhausted, normal capacity reporting would show little or no available space. The scenario instead says substantial block capacity remains while inode usage is at 100%.
- C — Read-only filesystem: A read-only mount prevents writes and typically produces a read-only filesystem error rather than evidence of completely consumed inodes. It also does not explain the explicit
df -iresult. - D — Corrupted LVM metadata: LVM metadata problems can interfere with volume discovery or activation. They do not specifically produce the combination of free filesystem blocks and 100% inode consumption described here.
Key takeaway: A filesystem can have free data blocks but still be unable to create files when every inode is already in use.
Preview complete
You have tried all three samples
Review the explanations or try the samples again. This short preview covers only a small part of the exam objectives.
Your sample score resets when this page reloads.
Your practice pack includes
More ways to make each study session count
Focus on a topic, practise under a time limit, or return to the supporting resources before your next attempt.
Domain-based practice
Timed practice sets
Study guide
Flashcards
Requirements
- CompTIA recommends 12 months of hands-on experience working with Linux servers and recommends A+, Network+, Server+, or similar certification-level knowledge for candidates preparing for XK0-006 V8.
- If some objectives are unfamiliar, combine question practice with foundational study and your own exercises involving storage, networking, systemd, containers, permissions, firewalls, shell scripting, Git, automation, and troubleshooting.
- You will need an internet-connected device, a current web browser, and an ExamsDigest account to use the online practice product; this does not imply offline access or a separate mobile application.
Know the exam you’re studying for
These details describe CompTIA’s official Linux+ XK0-006 (V8) exam.
What our students say
“I used the Linux+ practice exams during my final review and they helped me find weak areas in networking, systemd, permissions, and troubleshooting. The explanations made it much easier to understand why one command or configuration was better than the others.”
Ethan Marlow
✓ Verified Review
“The questions covered a good mix of Linux administration, security, automation, storage, and troubleshooting. Reviewing the questions I missed helped me focus on the XK0-006 objectives that needed more practice.”
Sofia Bennett
✓ Verified Review
“I had already worked through other Linux+ study resources before trying ExamsDigest. What I liked most was how clearly the explanations broke down each option, because it helped me understand the command behavior instead of just memorizing the correct answer.”
Adrian Whitaker
✓ Verified Review
Your questions, answered.
Which Linux+ exam version do these practice questions target?
Who is Linux+ XK0-006 practice intended for?
How should I combine Linux+ practice with hands-on study?
What should I do when I answer a question incorrectly?
What question formats appear on the official XK0-006 exam?
Does completing this practice earn the CompTIA Linux+ certification?
30-day conditional refund policy
Eligible requests must be made within 30 calendar days, with no more than 20% of any included simulator completed. The purchase must not already be refunded or under a payment dispute or chargeback. Other provisions apply; mandatory consumer rights remain unaffected.
Useful links for your preparation
