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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA Linux+ Certification Exam |
| Exam Number: | XK0-006 |
| Real Exam Qty: | Maximum of 90 |
| Exam Format: | Performance-based, Multiple-choice |
| Related Certifications: | CompTIA Linux+ |
| Exam Duration: | 90 minutes |
| Available Languages: | English |
| Exam Price: | USD 348 |
| Certificate Validity Period: | 3 years |
| Passing Score: | 720 (on a scale of 100–900) |
| 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 # 12
A Linux system displays the following error during operation:
Kernel panic - not syncing: Fatal Machine check
Pid: 0, comm: swapper Tainted: G M
Call Trace:
...
mce_panic
do_machine_check
Which of the following is the most likely cause of this issue?
Answer: C
Explanation:
The correct answer is B. Hardware failure (CPU or memory) because the error message explicitly references a
"Machine Check Exception (MCE)", which is a hardware-level error detected by the CPU. The line "Kernel panic - not syncing: Fatal Machine check" indicates that the kernel encountered a critical, unrecoverable hardware condition and halted the system to prevent further damage or data corruption.
Machine Check Exceptions are generated by the CPU when it detects internal errors such as cache failures, bus errors, or memory corruption. These errors are typically associated with faulty hardware components like the processor, RAM, motherboard, or even overheating issues. The presence of functions like mce_panic and do_machine_check in the call trace further confirms that the kernel is responding to a hardware-level fault.
Option A (Filesystem corruption) is incorrect because filesystem issues usually generate I/O errors or mount failures, not machine check exceptions.
Option C (Misconfigured bootloader) is incorrect because bootloader problems typically prevent the system from starting properly, rather than causing runtime kernel panics with hardware-related traces.
Option D (Incorrect file permissions) is incorrect because permission issues affect user access and application behavior, not kernel-level operations.
From a Linux+ troubleshooting perspective, kernel panics related to machine checks require hardware diagnostics. Administrators should inspect system logs (/var/log/messages, dmesg), run memory tests (e.g., memtest86+), check CPU health, and verify system cooling. Hardware replacement or firmware updates may be necessary to resolve the issue.
NEW QUESTION # 13
A systems administrator is creating a new shared directory. Which of the following commands ensures all users from the same group will be able to work with the newly created files?
Answer: C
Explanation:
Setting the setgid bit on a shared directory causes newly created files and subdirectories to inherit the directory's group ownership, allowing members of the same group to collaborate consistently on new files.
NEW QUESTION # 14
A systems administrator is helping to secure a new web application. During the tests, the administrator obtains the following output to validate the application:
SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384
ALPN, server accepted to use http/1.1
Server certificate:
subject: CN=*.newapp.comptia.org
start date: Jan 17 00:00:00 2024 GMT
expire date: Feb 16 23:59:59 2034 GMT
issuer: C=US; O=Comptia; OU=IT Security; CN=ca1.comptia.org
SSL certificate verify result: unable to get local issuer certificate (20), continuing anyway.
Which of the following explains the validation results?
Answer: B
Explanation:
The correct answer is A. The certificate was not signed by a trusted authority, which was forcefully ignored during the tests. The key indicator in the output is the message: "SSL certificate verify result: unable to get local issuer certificate (20), continuing anyway." This error means that the client system cannot validate the certificate chain because it does not recognize or trust the certificate authority (CA) that issued the server certificate.
In TLS/SSL validation, the client must verify that the server's certificate chains up to a trusted root CA present in the local trust store. If the issuer (in this case, ca1.comptia.org) is not included in the client's trusted certificate authorities, the verification fails. However, the phrase "continuing anyway" indicates that the validation failure was bypassed-likely due to a testing flag such as -k or --insecure in curl-allowing the connection despite the trust issue.
Option B is incorrect because the certificate validity dates show it is valid from 2024 to 2034, not expired.
Option C is incorrect because wildcard certificates (e.g., *.newapp.comptia.org) are commonly used and not inherently insecure when properly managed.
Option D is incorrect because the cipher suite shown (ECDHE-RSA-AES256-GCM-SHA384) is considered strong and modern, not outdated.
From a Linux+ security perspective, proper certificate validation is critical. Administrators should ensure that the issuing CA is trusted by installing the correct CA certificates rather than bypassing validation, which exposes systems to man-in-the-middle attacks and other security risks.
NEW QUESTION # 15
A Linux administrator needs to securely erase the contents of a hard disk. Which of the following commands is the best for this task?
Answer: A
Explanation:
The shred command securely erases data by overwriting the specified device or file multiple times, making recovery nearly impossible. This is the best option for securely erasing a hard disk.
NEW QUESTION # 16
An
administrator is investigating the reason a Linux workstation is not resolving the website http://www.comptia.
org. The administrator executes some commands and receives the following output:
Which of the following is the most likely cause?
Answer: A
Explanation:
When troubleshooting name resolution issues in Linux, /etc/hosts entries take precedence over DNS lookups.
The workstation's /etc/hosts file contains the line:
CopyEdit
104.18.99.101 www.comptia.org
This means any attempt to access www.comptia.org will resolve to 104.18.99.101, regardless of the real DNS response. However, both dig and nslookup show the correct IP as 104.18.16.29. Because the local /etc/hosts entry overrides DNS, and the hardcoded IP is either incorrect or unreachable, all network traffic to www.
comptia.org will fail or not reach the intended destination, resulting in the observed connectivity issue (Destination Host Unreachable).
Other options:
B). The lack of IPv6 support is irrelevant since the host is using IPv4 and the DNS queries for IPv4 (A record) are successful.
C). The firewall would block all HTTP/HTTPS connections, but the error shown is a host unreachable, not a port-specific issue.
D). The nameserver is working; both dig and nslookup queries succeed and return the correct A record.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 8: " Networking Fundamentals " , Section: " Troubleshooting Name Resolution " CompTIA Linux+ XK0-006 Objectives, Domain 2.0: Networking
NEW QUESTION # 17
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