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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA Linux+ Certification Exam (XK0-006) |
| Exam Number: | XK0-006 |
| Exam Price: | Approximately USD 358 (varies by region) |
| Exam Format: | Multiple-choice questions, Performance-based questions (PBQs) |
| Related Certifications: | CompTIA Network+ CompTIA Security+ CompTIA A+ |
| Exam Duration: | 90 minutes |
| Real Exam Qty: | Maximum 90 |
| Available Languages: | English |
| Certificate Validity Period: | 3 years |
| Passing Score: | 720 (on a scale of 100–900) |
| Recommended Training: | CompTIA Official Training Resources CompTIA CertMaster Learn (Linux+ XK0-006) |
| Exam Registration: | CompTIA Linux+ Official Certification Page Pearson VUE Exam Registration |
| Sample Questions: | CompTIA XK0-006 Sample Questions |
| Exam Way: | Online (proctored) or onsite testing via Pearson VUE centers |
| Pre Condition: | No mandatory prerequisites, but 12–24 months of Linux administration experience or CompTIA A+ / Network+ knowledge is recommended. |
| Official Syllabus URL: | https://www.comptia.org/certifications/linux |
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NEW QUESTION # 185
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 # 186
A newly hired Linux administrator needs to grant access to the Linux servers by generating a password-protected RSA key of 4096 bytes. Which of the following commands will accomplish this task?
Answer: C
Explanation:
The ssh-keygencommand is used to generate SSH key pairs. To generate an RSA key with a length of 4096 bits, the correct syntax is:
1.-t rsa: Specifies the type of key to generate, which is RSA.
2.-b 4096: Specifies the number of bits for the key, in this case 4096.
By running this command, the user will be prompted to enter a passphrase to password-protect the key, which satisfies the requirement for generating a password-protected RSA key of 4096 bits.
NEW QUESTION # 187
The development team asks a Linux administrator to help diagnose a connectivity issue that is occurring with a newly developed software. The Linux administrator reviews the following output:
$ wget -vvv https://api.newapp.comptia.org/v2/health
Resolving proxy.comptia.org (proxy.comptia.org)... connected.
ERROR: The certificate of ' api.newapp.comptia.org ' is not trusted.
ERROR: The certificate of ' api.newapp.comptia.org ' does not have a known issuer.
Which of the following actions is the best way to resolve the issue?
Answer: B
Explanation:
The correct answer is A. Verify the remote certificate is trustworthy, and add it to the local trusted certificates repository because the error clearly indicates that the system does not recognize the certificate authority (CA) that issued the server's SSL/TLS certificate. This is a trust issue, not necessarily a problem with the certificate itself.
When wget reports that the certificate "is not trusted" and "does not have a known issuer," it typically means the CA certificate is missing from the local trust store. The proper and secure resolution is to first validate that the remote certificate is legitimate (for example, confirming it with the issuing authority or organization).
Once verified, the administrator should add the CA certificate to the system's trusted certificate store (e.g., /etc
/pki/ca-trust/ or /usr/local/share/ca-certificates/ depending on the distribution) and update the trust database.
Option B is incorrect because using a self-signed certificate introduces additional trust issues and is not appropriate for production environments unless properly managed.
Option C is incorrect because the error message does not indicate that the certificate is expired, only that the issuer is unknown.
Option D is incorrect because using --no-check-certificate bypasses SSL verification entirely, which creates a significant security vulnerability and violates best practices.
From a Linux+ security perspective, maintaining proper certificate validation is essential for secure communications. Administrators must ensure that trusted CAs are properly configured rather than bypassing verification mechanisms.
NEW QUESTION # 188
A systems administrator wants to check if the ntpd service is configured to start on startup. Which of the following commands will show that information when run?
Answer: B
NEW QUESTION # 189
Which of the following most accurately describes a webhook?
Answer: B
Explanation:
The correct answer is D. An HTTP-based callback function. A webhook is a mechanism that allows one system to automatically send real-time data to another system via HTTP when a specific event occurs. Instead of continuously polling an API for updates, a webhook enables event-driven communication, making automation more efficient and responsive.
In practical Linux and DevOps environments, webhooks are widely used in automation, orchestration, and integration workflows. For example, a version control system like GitHub can trigger a webhook to notify a CI
/CD pipeline whenever new code is pushed. The receiving system exposes an HTTP endpoint (URL), and when the event occurs, the webhook sends an HTTP POST request with relevant data payload. This design significantly reduces overhead compared to polling mechanisms.
Option A is incorrect because webhooks are not authentication mechanisms. While authentication (such as tokens or signatures) may be used to secure webhook communication, it is not their primary purpose.
Option B is incorrect because SNMP (Simple Network Management Protocol) is unrelated to webhooks.
SNMP is used for monitoring and managing network devices, whereas webhooks operate over HTTP/HTTPS protocols.
Option C is incorrect because although webhooks can transmit data (including sensitive information if not properly secured), their purpose is not specifically to transmit sensitive data but to notify systems of events through automated callbacks.
From a Linux+ perspective, understanding webhooks is essential in automation and orchestration tasks. They are commonly integrated into scripts, configuration management tools, and cloud-native workflows to enable reactive, event-driven system behavior, improving efficiency and scalability in modern infrastructure environments.
NEW QUESTION # 190
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