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| Section | Weight | Objectives |
|---|---|---|
| Scripting, Containers & Automation | 20% | - Automation and scripting
|
| System Management | 30% | - Linux installation, configuration, and system management
|
| Security | 25% | - System security and access control
|
| Troubleshooting | 25% | - System and network troubleshooting
|
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NEW QUESTION # 68
A Linux administrator needs to create and then connect to the app-01-image container. Which of the following commands accomplishes this task?
Answer: A
Explanation:
Container lifecycle management is a core topic within the Automation, Orchestration, and Scripting domain of CompTIA Linux+ V8. Administrators must understand the difference between creating containers, starting containers, and executing commands within running containers.
The correct command is docker run -it app-01-image. The docker run command performs three actions at once: it creates a new container from the specified image, starts the container, and optionally attaches the administrator's terminal to it. The -i option keeps standard input open, while the -t option allocates a pseudo- terminal (TTY). Together, these options allow the administrator to interactively connect to the container immediately after it is created.
The other options are incorrect for the following reasons. docker start is used only to start an existing stopped container and does not create a new container from an image. Additionally, -t and -d are not valid options for attaching an interactive terminal during container startup. docker build is used to build a Docker image from a Dockerfile and cannot be used to create or connect to a container. docker exec is used to run commands inside an already running container and therefore cannot be used to create a container.
Linux+ V8 documentation emphasizes that docker run is the primary command used when administrators want to instantiate containers from images and interact with them. This command is commonly used during testing, development, and troubleshooting workflows.
NEW QUESTION # 69
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: A
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 # 70
A Linux user runs the following command:
nohup ping comptia.com &
Which of the following commands should the user execute to attach the process to the current terminal?
Answer: A
Explanation:
The fg command brings a background job to the foreground, attaching it to the current terminal.
Since the ping process was started in the background with &, fg is the correct way to reattach it.
NEW QUESTION # 71
Which of the following commands would a Linux administrator use to determine the temperature of a motherboard?
Answer: A
Explanation:
This utility reads hardware sensor data exposed by the system, including motherboard and CPU temperature values, allowing administrators to monitor system thermal conditions.
NEW QUESTION # 72
An administrator added a new disk to expand the current storage. Which of the following commands should the administrator run first to add the new disk to the LVM?
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
To add a new physical disk to LVM, the disk must first be initialized as a physical volume using the pvcreate command. This prepares the new disk for use by the LVM subsystem. After initializing with pvcreate, you would use vgextend to add the new physical volume to an existing volume group.
Other options:
* A. vgextend adds a physical volume to a volume group, but you must use pvcreate first.
* B. lvextend is used to increase the size of a logical volume, not to add a new disk.
* D. pvresize is used to resize an existing physical volume, not to create one.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 7: "Managing Storage", Section: "Managing Logical Volumes" CompTIA Linux+ XK0-006 Objectives, Domain 4.0: Storage and Filesystems
NEW QUESTION # 73
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