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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA Linux+ Certification Exam |
| Exam Number: | XK0-006 |
| Real Exam Qty: | Up to 90 |
| Available Languages: | English |
| Certificate Validity Period: | 3 years |
| Passing Score: | 720 (scale 100โ900) |
| Related Certifications: | CompTIA A+ CompTIA Server+ CompTIA Network+ |
| Exam Price: | $358 USD |
| Exam Duration: | 90 minutes |
| Exam Format: | Multiple-choice, Performance-based questions |
| Recommended Training: | CompTIA CertMaster Learn CompTIA Official Study Materials |
| Exam Registration: | Pearson VUE Exam Scheduling CompTIA Official Registration |
| Sample Questions: | CompTIA XK0-006 Sample Questions |
| Exam Way: | Online proctored or onsite at Pearson VUE testing centers |
| Pre Condition: | No mandatory prerequisites; 12 months of hands-on Linux experience or CompTIA A+/Network+/Server+ recommended |
| Official Syllabus URL: | https://www.comptia.org/certifications/linux |
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NEW QUESTION # 52
A systems administrator needs to validate that the dm_multipathdriver was loaded in a Linux system. Which of the following commands should the administrator use?
Answer: D
Explanation:
lsmodlists currently loaded kernel modules; piping to grep dm_multipathconfirms whether that specific driver is active in the running kernel.
NEW QUESTION # 53
Which of the following can be implemented with PAM to detect and block dictionary attacks?
Answer: A
Explanation:
This PAM module tracks failed authentication attempts and can automatically lock accounts after a defined threshold is exceeded, effectively detecting and blocking dictionary and brute-force attacks.
NEW QUESTION # 54
A systems administrator is having issues with a third-party API endpoint. The administrator receives the following output:
Which of the following actions should the administrator take to resolve the issue?
Answer: A
Explanation:
This scenario represents a name resolution failure, which is a common troubleshooting case addressed in CompTIA Linux+ V8. The critical clues are the error messages returned by both curl and dig.
The curl error "Could not resolve host" indicates that the system is unable to translate the hostname into an IP address. This is confirmed by the dig output, which returns NXDOMAIN, meaning the DNS resolver cannot resolve the requested domain name. Importantly, the dig output shows that the query is reaching a DNS server (10.255.255.254), but the resolution fails, strongly pointing to a DNS client configuration issue.
Option C, reviewing and fixing the DNS client configuration file (such as /etc/resolv.conf or systemd- resolved settings), is the correct action. Linux+ V8 documentation highlights DNS misconfiguration as a primary cause of application connectivity issues. Incorrect nameserver entries, unreachable DNS servers, or misconfigured resolvers commonly produce NXDOMAIN responses.
The other options are incorrect. Firewall issues would result in connection timeouts, not DNS resolution failures. Requesting a new API endpoint is unnecessary without first confirming local DNS functionality.
Internet connectivity issues would typically prevent any DNS communication, but here a DNS server is clearly being contacted.
Linux+ V8 stresses a layered troubleshooting approach: verify DNS resolution before investigating network ports or application logic. Therefore, the correct answer is C. Review and fix the DNS client configuration file.
NEW QUESTION # 55
Which of the following cryptographic functions ensures a hard drive is encrypted when not in use?
Answer: A
Explanation:
Disk encryption is a key Linux+ V8 security objective, especially for protecting data at rest. LUKS (Linux Unified Key Setup) is the standard Linux framework for full-disk and partition-level encryption.
Option B is correct. LUKS provides strong encryption for storage devices, ensuring that data remains unreadable when the system is powered off or the disk is removed. It integrates with tools like cryptsetup and supports key management, passphrases, and multiple unlock methods.
The other options are incorrect. GPG encrypts files, not entire disks. PKI certificates are used for identity and trust, not disk encryption. OpenSSL is a cryptographic library, not a disk encryption mechanism.
Linux+ V8 documentation explicitly identifies LUKS as the primary solution for disk encryption on Linux systems. Therefore, the correct answer is B.
NEW QUESTION # 56
Which of the following most accurately describes a webhook?
Answer: B
Explanation:
Webhooks are commonly used in automation and DevOps workflows, which are emphasized in the Linux+ V8 objectives. A webhook is best described as an HTTP-based callback mechanism that allows one system to notify another when a specific event occurs.
Option D correctly defines a webhook. Instead of polling an API at regular intervals, a webhook allows an application to automatically send an HTTP request-typically a POST-to a predefined URL when an event happens. This makes webhooks efficient, event-driven, and well-suited for automation pipelines, CI/CD systems, and monitoring integrations.
The other options are incorrect. Option A confuses webhooks with authentication mechanisms. Option B incorrectly associates webhooks with SNMP, which is a separate protocol. Option C is misleading because webhooks are not inherently designed for transmitting sensitive data and require additional security measures such as TLS and authentication.
Linux+ V8 documentation highlights webhooks as a key integration method in automated environments, enabling systems to react in real time to changes or triggers.
Therefore, the correct answer is D.
NEW QUESTION # 57
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