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NEW QUESTION # 203
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: D
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 # 204
Which of the following actions is required to establish passwordless SSH authentication?
Answer: C
Explanation:
Copying the public SSH key to the remote server's authorized_keys file is all that's needed to enable passwordless SSH authentication.
NEW QUESTION # 205
A systems technician needs to install a third-party software package. Which of the following commands would allow the technician to download this software package from a remote server?
Answer: A
Explanation:
wget is specifically designed to download files from remote servers using HTTP, HTTPS, or FTP protocols, making it the appropriate command for retrieving software packages.
NEW QUESTION # 206
A Linux administrator needs to create and then connect to the app-01-imagecontainer. Which of the following commands accomplishes this task?
Answer: B
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 # 207
A systems administrator needs to open the DNS TCP port on a Linux system from network 10.0.0.0/24.
Which of the following commands should the administrator use for this task?
Answer: A
Explanation:
Firewall configuration is a key topic in the Security domain of CompTIA Linux+ V8. DNS primarily uses UDP port 53, but TCP port 53 is also required for zone transfers, large responses, and certain reliability scenarios. In this case, the administrator explicitly needs to allow DNS over TCP from a specific network.
The correct command is ufw allow 53/tcp from 10.0.0.0/24. This rule allows incoming TCP traffic on port 53 only from the specified subnet, following the principle of least privilege. Linux+ V8 documentation emphasizes restricting firewall rules by source network whenever possible to minimize attack surfaces.
Option A is incorrect because UFW service aliases like dns are not always guaranteed to map explicitly to TCP, and the syntax is incomplete. Option B is invalid because ufw enable is used to enable the firewall globally and does not define rules. Option D disables firewall protections and introduces a major security risk.
Linux+ V8 best practices stress precise, minimal firewall rules instead of broad or disabling actions.
Therefore, C is the correct and secure choice.
NEW QUESTION # 208
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