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CompTIA Linux+ Certification Exam Sample Questions (Q295-Q300):

NEW QUESTION # 295
The users of a Linux system are unable to use one of the application filesystems. The following outputs have been provided:
bash
$ cd /app
$ touch file
touch: cannot touch 'file': Readonly file system
Output 2
/dev/sdcl on /app type ext4 (ro,relatime,seclabel,data=ordered)
Output 3
/dev/sdcl /app ext4 defaults 0 0
Output 4
[302.048075] Buffer I/O error on dev sdcl, logical block 0, async page read [302.048490] EXT4-fs (sdcl): Attempt to read block from filesystem resulted in short read while trying to re-open
/dev/sdcl
Which of the following actions will resolve this issue?

A. fsck -y /dev/sdcl mount -o rw,remount /app
B. umount /app xfs_repair /dev/sdcl mount /app
C. xfs_repair /dev/sdcl mount -o rw,remount /app
D. umount /app fsck -y /dev/sdcl mount /app

Answer: A

Explanation:
The filesystem is in read-only mode, likely due to corruption or errors detected. Running fsck -y will check and repair the filesystem, and mount -o rw,remount will remount it as read-write, making it usable again. This is a common troubleshooting step for filesystems with errors.

NEW QUESTION # 296
A Linux engineer has been notified about the possible deletion of logs from the file /opt/app/logs. The engineer needs to ensure the log file can only be written into without removing previous entries.
Which of the following commands would be BEST to use to accomplish this task?

A. chattr +a /opt/app/logs
B. chattr +i /opt/app/logs
C. chattr +c /opt/app/logs
D. chattr +d /opt/app/logs

Answer: A

Explanation:
The command chattr +a /opt/app/logs will ensure the log file can only be written into without removing previous entries. The chattr command is a tool for changing file attributes on Linux file systems.
The +a option sets the append-only attribute, which means that the file can only be opened in append mode for writing. This prevents the file from being modified, deleted, or renamed. This is the best command to use to accomplish the task. The other options are incorrect because they either set the wrong attributes (+d, +i, or +c) or do not affect the file at all (-a). References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 11: Managing Files and Directories, page 357.

NEW QUESTION # 297
An administrator thinks that a package was installed using a snap. Which of the following commands can the administrator use to verify this information?

A. snap try
B. snap list
C. snap find
D. snap install

Answer: B

Explanation:
The snap list command is used to display the installed snaps on the system1. Snaps are self-contained software packages that can be installed and updated across different Linux distributions2. The snap list command shows the name, version, revision, developer and notes of each snap1.
The snap find command is used to search for snaps in the Snap Store, which is an online repository of snaps2. The snap install command is used to install snaps from the Snap Store or from a local file2. The snap try command is used to test a snap without installing it, by mounting a directory that contains the snap files2. These commands are not useful for verifying if a package was installed using a snap.

NEW QUESTION # 298
A systems administrator needs to check if the service systemd-resolved.service is running without any errors.
Which of the following commands will show this information?

A. systemct1 show systemd-resolved.service
B. systemct1 mask systemd-resolved.service
C. systemct1 status systemd-resolved.service
D. systemct1 enable systemd-resolved.service

Answer: C

Explanation:
The command systemct1 status systemd-resolved.service will show the information about the service systemd- resolved.service. The systemct1 command is a tool for managing system services and units. The status option displays the current status of a unit, such as active, inactive, or failed. The output also shows the unit description, loaded configuration, process ID, memory usage, and recent log messages. This command will show if the service systemd-resolved.service is running without any errors. This is the correct command to use to accomplish the task. The other options are incorrect because they either perform different actions (enable, mask, or show) or do not show the status of the service (systemct1 show systemd-resolved.
service only shows the properties of the service, not the status). References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 14: Managing Processes and Scheduling Tasks, page 427.

NEW QUESTION # 299
A member of the production group issues the following command:
echo "Monday through Friday" > /production_docs/days
The command fails to execute, so the user obtains the following output:
drwxr--r-- root production 0 Jun 16 2018 production
-rw-r--r-- production production 4096 Jun 14 2018 days
Which of the following commands should the user execute to BEST fix the issue?

A. chgrp root production_docs/days to change the group ownership of the production_docs/ file days
B. chmod g+S production to set the GUID on the production_docs directory
C. chown production to change the ownership of the production_docs directory
D. chmod g+w production to change the permissions of the days file

Answer: C

Explanation:
The production group member is not allowed to modify the file because the owner of the directory is root and for group production is missing execute permission which is allowing to see inside directory and reach to file: -rw-r--r-- . Solution: change the directory owner from root to production or add execute permission to production group.

NEW QUESTION # 300
......

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