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NEW QUESTION # 27
A systems administrator is configuring new Linux systems and needs to enable passwordless authentication between two of the servers. Which of the following commands should the administrator use?
Answer: D
Explanation:
Comprehensive and Detailed 250 to 350 words of Explanation From Linux+ V8 documents:
Passwordless authentication using SSH key pairs is a foundational security practice covered in the Security domain of CompTIA Linux+ V8. It allows administrators to securely authenticate between systems without transmitting passwords over the network, significantly reducing the risk of credential compromise.
The correct approach involves two essential steps: generating an SSH key pair and installing the public key on the remote system. Option A correctly performs both steps using best-practice commands.
The command ssh-keygen -t rsa generates an RSA public/private key pair in the user's ~/.ssh/ directory. The private key (id_rsa) remains securely on the local system, while the public key (id_rsa.pub) is intended to be shared. The second part of the command, ssh-copy-id -i ~/.ssh/id_rsa.pub john@server2, securely copies the public key to the remote server's ~/.ssh/authorized_keys file. This enables key-based authentication for the specified user.
The other options are incorrect or incomplete. Option B uses ssh-keyscan, which is intended for collecting host keys to populate known_hosts, not for user authentication. Option C misuses ssh-agent, which manages keys already generated and does not create or install them. Option D is insecure and incorrect because copying the entire .ssh directory risks exposing private keys and violates security best practices.
Linux+ V8 documentation emphasizes the use of ssh-keygen and ssh-copy-id as the standard, secure method for configuring passwordless SSH access. This approach ensures proper permissions, correct key placement, and minimal risk.
NEW QUESTION # 28
A Linux administrator is updating the group membership by executing the following commands:
However, the group membership is not changing. Which of the following explains this issue?
Answer: C
Explanation:
Running groups with sudo shows the groups for the root user, not for the admin user. That's why the output only shows root. Without sudo, groups admin (or re-login) would correctly show the updated group membership, including wheel.
NEW QUESTION # 29
A DevOps engineer made some changes to files on a local repository. The engineer realizes that the changes broke the application and the changes need to be reverted back. Which of the following commands is the best way to accomplish this task?
Answer: B
Explanation:
The git reset command reverts changes in the local repository to a previous commit, effectively discarding the problematic modifications and restoring the application to a working state.
NEW QUESTION # 30
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 # 31
Which of the following commands can be used to display real-time running processes on a Linux system?
Answer: D
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 # 32
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