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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA Linux+ Certification Exam |
| Exam Number: | XK0-006 |
| Exam Duration: | 90 minutes |
| Passing Score: | 720 (on a scale of 100–900) |
| Exam Format: | Multiple-choice, Performance-based |
| Certificate Validity Period: | 3 years |
| Available Languages: | English |
| Real Exam Qty: | Maximum of 90 |
| Exam Price: | USD 348 |
| Related Certifications: | CompTIA Linux+ |
| Sample Questions: | CompTIA XK0-006 Sample Questions |
| Exam Way: | Online (via Pearson VUE) or In-person at Pearson VUE testing centers |
| Pre Condition: | No formal prerequisites; recommended 12 months of hands-on experience with Linux administration |
| Official Syllabus URL: | https://www.comptia.org/en-us/certifications/linux |
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NEW QUESTION # 183
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 # 184
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 # 185
An administrator has generated an RSA SSH key pair to log in to a remote server. After copying the public key and attempting to log in, the administrator sees the following message:
admin@192.168.10.50: Permission denied (publickey,password)
After seeing the message, the administrator attempts to connect using ssh -v admin@192.168.10.50 and notices the following debug output:
debug1: send_pubkey_test: no mutual signature algorithm
Which of the following actions should the administrator take first to remediate this issue?
Answer: A
Explanation:
The "no mutual signature algorithm" error means the RSA/SHA-1 key type (ssh-rsa) isn't supported by both client and server. Generating a new key with a modern algorithm (e.g., ssh- keygen -t ecdsa) ensures a mutually supported signature method.
NEW QUESTION # 186
A systems administrator is helping to secure a new web application. During the tests, the administrator obtains the following output to validate the application:
Which of the following explains the validation results?
Answer: B
Explanation:
The validation output indicates that the certificate chain could not be verified because the local system does not trust the issuing certificate authority, and the connection proceeded anyway by ignoring the verification failure during testing.
NEW QUESTION # 187
Which of the following commands should an administrator run to check for errors during startup?
Answer: D
Explanation:
The correct answer is B. dmesg because it displays the kernel ring buffer, which contains messages generated during system boot and runtime. These messages include hardware initialization details, driver loading status, and error or warning messages that occur during startup. This makes dmesg one of the most important tools for troubleshooting boot-related issues in Linux.
When a Linux system boots, the kernel initializes hardware components and loads drivers. Any issues encountered during this process-such as missing drivers, hardware failures, or misconfigurations-are logged in the kernel ring buffer. By running dmesg, administrators can review these messages and identify the root cause of startup problems. It is common to combine dmesg with tools like grep (e.g., dmesg | grep -i error) to filter relevant error messages.
Option A (modinfo) is incorrect because it provides information about kernel modules, such as version and dependencies, but does not display boot errors.
Option C (dracut) is incorrect because it is used to create or regenerate initramfs images, not to check system logs or startup errors.
Option D (lshw) is incorrect because it lists detailed hardware information but does not show boot-time errors or logs.
From a Linux+ troubleshooting perspective, analyzing boot logs is critical for diagnosing system issues. The dmesg command provides immediate access to kernel-level messages, making it an essential tool for identifying hardware and driver-related problems that occur during system startup.
NEW QUESTION # 188
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