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NEW QUESTION # 107
Which of the following commands can be used to display real-time running processes on a Linux system?
Answer: B
Explanation:
The correct answer is B. top because it provides a dynamic, real-time view of running processes and system resource usage. The top command is an essential Linux system monitoring utility that continuously updates information about CPU usage, memory consumption, running processes, load averages, and system uptime. It is widely used by system administrators for performance monitoring and troubleshooting.
When executed, top displays a full-screen interface showing active processes sorted by resource usage (typically CPU by default). It updates at regular intervals, allowing administrators to observe changes in real time. Additionally, it offers interactive features such as sorting processes, killing processes, and filtering output, which enhances system management capabilities.
Option A (ps) is incorrect because although it lists running processes, it provides only a snapshot at a specific moment in time. It does not update dynamically unless repeatedly executed or combined with other tools.
Option C (df) is incorrect because it displays disk space usage of filesystems, not running processes.
Option D (free) is incorrect because it shows memory usage statistics, including total, used, and available memory, but does not display process-level activity.
From a Linux+ perspective, understanding tools like top is crucial under System Management objectives. It enables administrators to monitor system health, identify resource-intensive processes, and take corrective actions when necessary. Real-time monitoring is particularly important in production environments where performance issues must be diagnosed and resolved quickly.
NEW QUESTION # 108
Users report that a Linux system is unresponsive and simple commands take too long to complete. The Linux administrator logs in to the system and sees the following: Output 1:
10:06:29 up 235 day, 19:23, 2 users, load average: 8.71, 8.24, 7.71
Which of the following is the system experiencing?
Answer: C
Explanation:
This scenario is a classic performance troubleshooting case covered under the Troubleshooting domain of the CompTIA Linux+ V8 objectives. The key indicators to analyze are the load average values and the CPU utilization statistics.
The uptime command shows load averages of 8.71, 8.24, and 7.71 over the 1-, 5-, and 15-minute intervals.
Load average represents the average number of processes that are either running on the CPU or waiting to run. On a system with 4 CPU cores, a healthy load average would typically be close to or below 4. Load averages consistently near or above 8 indicate that there are significantly more runnable processes than available CPU resources, causing processes to wait and resulting in poor system responsiveness.
The CPU output further confirms this condition. The %idle value is 0, meaning the CPU has no idle time available. The majority of CPU time is spent in user space (65.88%) and system/kernel space (20.54%), indicating heavy computational and kernel activity. While %iowait is present at 5.65%, it is not high enough to suggest that disk I/O is the primary bottleneck.
Option C, high CPU load, best explains the symptoms. High CPU load causes commands to execute slowly because processes are competing for limited CPU time. This directly matches the observed behavior of the system being unresponsive.
The other options are incorrect. High uptime simply indicates how long the system has been running and does not cause performance issues by itself. High latency is a general term and not a specific diagnosis shown by the metrics provided. High I/O wait times would require a significantly higher %iowait value.
According to Linux+ V8 documentation, correlating load averages with CPU core count and utilization is essential for accurate performance diagnosis. Therefore, the correct answer is C. High CPU load.
NEW QUESTION # 109
A Linux administrator needs to create accounts for a list of new users. The user account names have been defined in the user LIST variable by executing the following:
USER_LIST="alice bob charles"
Which of the following commands should the administrator use to successfully create the user accounts?
Answer: A
Explanation:
This command iterates over each username stored in the variable and executes the account creation command for each entry, which is the correct and reliable way to create multiple user accounts from a list in a shell script.
NEW QUESTION # 110
An administrator attempts to install updates on a Linux system but receives error messages regarding a specific repository. Which of the following commands should the administrator use to verify that the repository is installed and enabled?
Answer: A
Explanation:
The yum repolist all command lists all configured repositories along with their status (enabled or disabled), allowing the administrator to verify if the problematic repository is installed and active.
NEW QUESTION # 111
A systems administrator wants to terminate all the processes owned by testuser on a Linux VM.
Which of the following should the administrator use for this task?
Answer: A
Explanation:
This command identifies all processes owned by the specified user by extracting their process IDs and then terminates each one, ensuring that all running processes belonging to that user are stopped.
NEW QUESTION # 112
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