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NEW QUESTION # 99
A Linux administrator receives reports that an application hosted in a system is not completing tasks in the allocated time. The administrator connects to the system and obtains the following details:
$ uptime
12:47:43 up 22:17, 2 users, load average: 7.75, 5.72, 5.17
Which of the following is the most likely cause of the issue?
Answer: C
Explanation:
The correct answer is A. High CPU load because the uptime command output clearly shows elevated load averages (7.75, 5.72, 5.17), which indicate that the system is experiencing significant processing demand.
Load average represents the number of processes that are either actively using the CPU or waiting for CPU time. When this value is consistently higher than the number of available CPU cores, it suggests that the CPU is overloaded and processes are being delayed.
In this scenario, the application is not completing tasks within the expected time frame, which aligns with CPU contention. When too many processes compete for CPU resources, scheduling delays occur, causing slower execution of applications and services. This is a common performance bottleneck in Linux systems.
Option B (Insufficient disk space) is incorrect because disk space issues typically manifest as write failures or application errors related to storage, not high load averages.
Option C (Network latency) is incorrect because network issues would not directly impact the system's load average. Tools like ping or netstat would be more relevant for diagnosing such problems.
Option D (Memory leak) is partially plausible but not the most direct conclusion from the given data. A memory leak would typically be identified through high memory usage using tools like free, top, or vmstat, rather than load average alone.
From a Linux+ troubleshooting perspective, analyzing load average is critical for diagnosing performance issues. High load values strongly indicate CPU resource exhaustion, which directly impacts application responsiveness and task completion times.
NEW QUESTION # 100
A Linux systems administrator needs to extract the contents of a file named /home/dev/web.bkp to the /var
/www/html/ directory. Which of the following commands should the administrator use?
Answer: B
Explanation:
Comprehensive and Detailed 250 to 350 words of Explanation From Linux+ V8 documents:
File extraction and backup restoration are fundamental System Management tasks covered in CompTIA Linux+ V8. In this scenario, the administrator must extract the contents of an existing backup file into a target directory.
The correct command is option B, which uses cpio in extract mode. The command changes into the destination directory (/var/www/html/) using pushd, extracts the archive contents with cpio -idv, and then returns to the original directory with popd. This ensures that files are restored into the correct location without modifying paths inside the archive.
The cpio utility is commonly used for backups created with cpio -o and supports reading archive data from standard input. Linux+ V8 documentation includes cpio as a valid and supported archive format for backup and restore operations.
The other options are incorrect. Option A incorrectly assumes the backup is a gzip-compressed tar archive.
Option C creates a new archive instead of extracting one. Option D assumes the file is a ZIP archive, which is not indicated by the .bkp extension.
Linux+ V8 emphasizes using the correct tool based on the archive format and restoring files into the intended directory. Therefore, the correct answer is B.
NEW QUESTION # 101
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?
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 # 102
A Linux administrator is testing a web application on a laboratory service and needs to temporarily allow DNS and HTTP/HTTPS traffic from the internal network. Which of the following commands will accomplish this task?
Answer: C
Explanation:
The correct way to temporarily allow specific services in a particular zone with firewalld is to use firewall-cmd --add-service=service --zone=zone. Multiple services can be specified in curly braces and separated by commas. The correct syntax is:
bash
CopyEdit
firewall-cmd --add-service={dns,http,https} --zone=internal
This command will allow DNS (port 53), HTTP (port 80), and HTTPS (port 443) through the firewall for the "internal" zone temporarily (for the current runtime session).
NEW QUESTION # 103
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?
Answer: A
Explanation:
Package management troubleshooting is a critical Linux administration skill addressed in CompTIA Linux+ V8. After system patching, identifying which packages were installed, updated, or removed is often the first step in diagnosing application failures.
The dnf history command is specifically designed for this purpose. It displays a chronological list of all DNF transactions, including installations, upgrades, downgrades, and removals. Each transaction is assigned an ID and includes timestamps, affected packages, and actions taken. This allows administrators to correlate application failures with recent changes.
Option A is correct because it provides historical context rather than just current package state. Linux+ V8 documentation highlights dnf history as an essential auditing and rollback tool.
The other options are insufficient. dnf list shows installed or available packages but does not indicate when they were installed. dnf info displays metadata for a specific package but does not show transaction history.
dnf search is used to find packages by name or description.
By reviewing recent transactions with dnf history, administrators can quickly identify problematic updates and take corrective action, such as rolling back a package.
Therefore, the correct answer is A.
NEW QUESTION # 104
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