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[General] 100% Pass Quiz 2026 CompTIA Perfect Exam XK0-006 Outline

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【General】 100% Pass Quiz 2026 CompTIA Perfect Exam XK0-006 Outline

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CompTIA Linux+ Certification Exam Sample Questions (Q40-Q45):NEW QUESTION # 40
A Linux administrator needs to create and then connect to the app-01-imagecontainer. Which of the following commands accomplishes this task?
  • A. docker start -td app-01-image
  • B. docker build -ic app-01-image
  • C. docker exec -dc app-01-image
  • D. docker run -it app-01-image
Answer: D
Explanation:
The docker run -it command both creates a new container from the specified image and attaches to it interactively, which is exactly what the administrator needs.

NEW QUESTION # 41
An administrator completes maintenance on a server but cannot remount the logical volume.
Given the following output:

Which of the following commands should the administrator execute to resolve the issue?
  • A. vgimport data
  • B. lvchange -ay /dev/data/files
  • C. lvscan --all
  • D. vgchange -ay data
Answer: D
Explanation:
The error message "special device /dev/data/files does not exist" suggests that the volume group data is not activated. From the lvsand vgsoutput:
- The logical volume files exists within the data volume group.
- The volume group (VG) and logical volume (LV) appear correctly listed, but they might be in an inactive state due to maintenance.

NEW QUESTION # 42
Following the completion of monthly server patching, a Linux administrator receives reports that a critical application is not functioning. Which of the following commands should help the administrator determine which packages were installed?
  • A. dnf search
  • B. dnf info
  • C. dnf history
  • D. dnf list
Answer: C
Explanation:
The dnf history command shows a log of past package operations (install, update, remove), allowing the administrator to review which packages were installed or updated during the patching process.

NEW QUESTION # 43
A systems administrator changed the file permissions on the myfile file:
$ sudo chmod g+w myfile
$ ls -l myfile
-rwxrwxr-x 1 admin editors C 2022-10-13 10:45 myfile
Then the administrator added an existing user test to the editors group:
$ sudo usermod -aG editors test
However, the user test is still unable to edit the file. Which of the following solutions will fix this issue?
  • A. The file is only writable by the root user, and the user test needs root permissions.
  • B. The user test needs to log out and log back in before editing the myfile file.
  • C. The group for the user test needs to be reloaded by running sudo source /etc/group.
  • D. In order to edit the file, additional permissions are required that the user test does not have.
Answer: B
Explanation:
Group membership is only applied at login time. Having added "test" to the editors group, they must log out and log back in before the new group permissions take effect.

NEW QUESTION # 44
An average of one out of three users in a company cannot reach the company website. A Linux administrator determines that one of the three website servers is down. The administrator inspects the DNS configuration for the website and notices the following entry:

Which of the following accurately explains the issue?
  • A. DNS returns all three records in a different order each time, and the browser typically uses the first address in the DNS response.
  • B. The DNS configuration is missing corresponding AAAA records and PTR records, and this is causing clients to fail the hostname translation.
  • C. One of the DNS records has not been signed with a DNSSEC-supported key, and this is causing some web browsers to reject the DNS response.
  • D. The administrator has incorrectly configured the DNS server to be an iterative resolver instead of an authoritative resolver.
Answer: A
Explanation:
With multiple A records, DNS performs simple round-robin ordering and returns the records in a different sequence on each query. Most clients try the first address returned-so when the downed server's IP appears first (about one in three times), those users cannot connect.

NEW QUESTION # 45
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