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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Troubleshooting | 25% | - System and network troubleshooting
|
| Topic 2: System Management | 30% | - Linux installation, configuration, and system management
|
| Topic 3: Scripting, Containers & Automation | 20% | - Automation and scripting
|
| Topic 4: Security | 25% | - System security and access control
|
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NEW QUESTION # 40
A Linux administrator wants to add a user to the Docker group without changing the user's primary group.
Which of the following commands should the administrator use to complete this task?
Answer: D
Explanation:
User and group management is a core System Management topic in CompTIA Linux+ V8. When adding a user to an additional group-such as the docker group-care must be taken not to alter the user's primary group.
The correct command is sudo usermod -aG docker user. The -G option specifies a supplementary group, and the -a (append) option ensures the user is added to the group without removing existing group memberships. This is especially important because omitting -a would overwrite the user's supplementary groups.
Option B, usermod -g docker user, changes the user's primary group, which is not desired. Options A and D misuse groupmod, which is intended for modifying group properties, not user membership.
Linux+ V8 documentation explicitly warns that failing to use -a with -G can unintentionally remove a user from all other supplementary groups, potentially causing access issues.
Therefore, the correct and safe command is C. sudo usermod -aG docker user.
NEW QUESTION # 41
An administrator thinks that the user Joe may be running an unauthorized process on a Linux server. Which of the following commands should the administrator run to confirm this idea?
Answer: C
Explanation:
top -u Joe filters the process display to only show processes owned by user Joe, allowing the administrator to see if Joe is running any unauthorized processes.
NEW QUESTION # 42
A Linux administrator tries to install Ansible in a Linux environment. One of the steps is to change the owner and the group of the directory /opt/Ansible and its contents. Which of the following commands will accomplish this task?
Answer: C
Explanation:
The chown command is used to change the owner and group of files and directories. The -R (recursive) flag ensures that all contents within the directory are also updated. The correct syntax is chown -R owner:group directory. So, chown -R Ansible:Ansible /opt/Ansible will change the owner and group for /opt/Ansible and everything inside it to "Ansible".
NEW QUESTION # 43
Which of the following utilities supports the automation of security compliance and vulnerability management?
Answer: A
Explanation:
OpenSCAP is a framework that automates security compliance checking and vulnerability management by using standardized security content (SCAP). It helps administrators enforce policies and detect vulnerabilities.
NEW QUESTION # 44
Users cannot access a server after it has been restarted. At the server console, the administrator runs the following commands;
Which of the following is the cause of the issue?
Answer: C
Explanation:
This issue is a classic example of post-reboot connectivity troubleshooting, which falls under the Troubleshooting domain of CompTIA Linux+ V8. The administrator has correctly gathered evidence using multiple diagnostic tools, allowing the root cause to be identified through correlation.
The ss -lnt output confirms that the SSH daemon is running and listening on TCP port 22. This eliminates the possibility that the SSH service failed to start after reboot. Additionally, the uptime output shows a very low load average, indicating that system performance is not a limiting factor. The successful ping test confirms that the server is reachable at the network layer and that DNS resolution and basic connectivity are functioning correctly.
The critical clue comes from the firewall configuration. The output of firewall-cmd --list-all shows that only specific services are allowed through the firewall, such as https, dns, and cockpit. The SSH service is notably absent. On systems using firewalld, services must be explicitly allowed, even if the daemon itself is running and listening on the correct port.
As a result, incoming SSH connection attempts are being blocked by the firewall, preventing users from accessing the server remotely after reboot. This aligns precisely with option B.
The other options are incorrect. DNS is functioning, as shown by successful ping responses. System load is low and not contributing to the issue. There is no indication that users are attempting to access the web server using an incorrect protocol.
Linux+ V8 documentation emphasizes that administrators must verify both service status and firewall rules when diagnosing access issues. In this case, allowing SSH with a command such as firewall-cmd --add- service=ssh --permanent followed by a reload would resolve the problem.
NEW QUESTION # 45
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