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NEW QUESTION # 97
SIMULATION 3
You are a systems administrator and have created an uncompressed backup of the application directory. Several hours later, you must restore the application from backup.
INSTRUCTIONS
Within each tab, click on an object to form the appropriate command used to create the backup and restore the application.
Command objects may only be used once, but the spacebar object may be used multiple times.
Not all objects will be used. Click the arrow to remove any unwanted objects from your command.
If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.
Answer:
Explanation:
-cvf creates (-c) a verbose (-v) archive file (-f) named /backups/application.tar.
-C /opt/ application changes to /opt/ so only the relative application directory is saved, avoiding absolute paths.
-xvf extracts (-x) the same archive, and -C /opt/ restores the contents back into the original location.
NEW QUESTION # 98
An administrator updates the network configuration on a server but wants to ensure the change will not cause an outage if something goes wrong. Which of the following commands allows the administrator to accomplish this goal?
Answer: D
Explanation:
netplan try applies the new network configuration temporarily and waits for user confirmation. If not confirmed, it automatically reverts, preventing outages from misconfigurations.
NEW QUESTION # 99
Which of the following best describes the role of initrd?
Answer: B
Explanation:
initrd (initial ramdisk) provides essential kernel modules and drivers (e.g., for storage and filesystems) needed during the early boot process before the root filesystem is mounted.
NEW QUESTION # 100
A Linux server is experiencing slowness. A systems administrator obtains the following output:
top - load average: 2.43, 1.80, 2.32
Tasks: ... 154 zombie
%Cpu(s): 6.2 us, 5.1 sy, 0.0 ni, 79.2 id, 9.1 wa, ...
$ iostat -m 2
%user %nice %system %iowait %steal %idle
4.30 2.02 0.29 70.38 4.00 19.01
Which of the following explains the issue?
Answer: A
Explanation:
Performance troubleshooting in CompTIA Linux+ V8 requires the ability to correlate metrics from tools like top, vmstat, and iostat. In this case, the iostat output provides the most critical data point: %iowait is at
70.38%.
The %iowait metric (also shown as wa in top) represents the percentage of time that the CPU was idle while there were outstanding disk I/O requests. Essentially, the CPU is waiting for the storage subsystem (hard drives or SSDs) to complete read or write operations. A value as high as 70% indicates a severe bottleneck in the storage layer. This " I/O wait " causes the system to feel sluggish or unresponsive because processes are stuck in an uninterruptible sleep state while waiting for data from the disk.
The top output also shows that the overall CPU is 79.2% idle, which confirms that the problem is NOT a lack of computational power (overutilization), making Option B incorrect. The system has 154 zombie processes, which might indicate poorly written software, but zombies themselves do not consume resources or cause slowness. There is no evidence of swap exhaustion (Option A) or a need for patching (Option D) provided in the statistics.
According to Linux+ V8 best practices, when high I/O wait is detected, administrators should investigate disk health, controller performance, or application-level disk usage (e.g., a database performing heavy indexing).
Therefore, high storage I/O latency is the verified explanation for the server slowness.
NEW QUESTION # 101
Users cannot access an application that is running inside containers. The administrator wants to validate whether the containers are running. Which of the following commands should the administrator use?
Answer: B
Explanation:
Container troubleshooting is a key competency within the Automation, Orchestration, and Scripting domain of CompTIA Linux+ V8. When users report that an application running inside containers is not accessible, one of the first validation steps is to confirm whether the containers are currently running.
The docker ps command is specifically designed to list running containers on the system. By default, it displays container IDs, image names, command executed, uptime, port mappings, and container names. This allows administrators to quickly determine whether the application container is active and whether it is exposing the expected ports. This aligns directly with Linux+ V8 guidance on container lifecycle management and operational validation.
The other options are not suitable for this purpose. docker start is used to start one or more stopped containers but does not display container status. docker run creates and starts a new container, which is not appropriate when the goal is only to check the status of existing containers. docker images lists locally available container images but provides no information about running or stopped containers.
Linux+ V8 documentation emphasizes the importance of using the correct Docker subcommands when diagnosing containerized applications. Verifying container runtime state using docker ps is a foundational troubleshooting step before investigating networking, firewall rules, or application-level errors.
Therefore, the correct command to validate whether containers are running is docker ps, making Answer B correct.
NEW QUESTION # 102
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