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NEW QUESTION # 16
Which of the following is a reason multiple password changes on the same day are not allowed?
Answer: A
Explanation:
Password policy enforcement is a critical component of system security covered in the CompTIA Linux+ V8 objectives. One common control implemented in Linux systems is restricting how frequently users can change their passwords, often referred to as minimum password age enforcement.
The primary reason multiple password changes within a short time frame are not allowed is to prevent password cycling attacks. Without this restriction, a user could repeatedly change their password in quick succession to bypass password history controls and eventually reuse a previously compromised or weak password. Option C accurately describes this scenario and aligns directly with Linux+ V8 security guidance.
Linux systems enforce this behavior through tools such as chage and PAM (Pluggable Authentication Modules). Administrators can configure minimum password age values to ensure users must wait a defined period before changing passwords again. This ensures that password history requirements are effective and meaningful.
The other options are incorrect. Option A confuses password expiration with brute-force mitigation, which is typically addressed through account lockout policies. Option B refers to password complexity, which is enforced through character requirements rather than change frequency. Option D is unrelated, as password expiration policies do not enforce multifactor authentication.
Linux+ V8 documentation emphasizes layered access controls, and preventing password reuse through enforced timing restrictions is a core principle of secure authentication design.
Therefore, the correct answer is C.
NEW QUESTION # 17
A Linux user needs to authenticate to a Windows Active Directory domain. Which of the following configuration files contains the domain configuration details?
Answer: C
Explanation:
In modern Linux enterprise environments, integrating with Windows Active Directory (AD) is a common requirement for centralized identity management. According to CompTIA Linux+ V8, the System Security Services Daemon (SSSD) is the recommended way to handle authentication and authorization against remote providers like AD or LDAP.
The sssd.conf file (typically located in /etc/sssd/) is the primary configuration file for this service. It contains the essential " domain configuration details, " including:
* The AD domain name.
* The authentication provider (e.g., id_provider = ad).
* The URI of the domain controllers.
* Caching settings for offline login.
SSSD provides a unified interface that manages the communication between the Linux system and the AD domain, simplifying the authentication stack.
The other options are related but do not serve as the primary domain configuration file. krb5.conf (Option B) configures Kerberos, which is used for the underlying ticket-based authentication, but SSSD often manages these details automatically or relies on it as a sub-component. pam.conf (Option C) manages the Pluggable Authentication Modules stack but does not store domain-specific details.
smb.conf (Option D) is the configuration for Samba; while Samba is used for file sharing and can assist in joining a domain, sssd.conf is the verified location for modern identity integration details in Linux+ V8 environments.
NEW QUESTION # 18
A Linux administrator needs to create and then connect to the app-01-image container. Which of the following commands accomplishes this task?
Answer: C
Explanation:
Comprehensive and Detailed 250 to 350 words of Explanation From Linux+ V8 documents:
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 # 19
A systems administrator needs to integrate a new storage array into the company's existing storage pool. The administrator wants to ensure that the server is able to detect the new storage array. Which of the following commands should the administrator use to ensure that the new storage array is presented to the systems?
Answer: A
Explanation:
The lsscsi command is used to list information about SCSI devices (including storage arrays) that are attached to the system. This is critical when integrating a new storage array because it allows the administrator to verify that the operating system detects the new device at the SCSI layer, which is the underlying interface for most enterprise storage solutions. lsscsi outputs a list of recognized SCSI devices, their device nodes, and associated information.
NEW QUESTION # 20
A Linux administrator just finished setting up passwordless SSH authentication between two nodes. However, upon test validation, the remote host prompts for a password. Given the following logs:
Which of the following is the most likely cause of the issue?
Answer: C
Explanation:
This issue is directly related to SELinux enforcement, which is a key topic in the Security domain of CompTIA Linux+ V8. The logs clearly indicate that SSH key-based authentication is failing due to an SELinux access control violation rather than a traditional file permission or SSH configuration problem.
The most important clue is the AVC denial message, which shows that the sshd process is being denied read access to the authorized_keys file. The security context of the file is listed as unconfined_u:object_r:
home_root_t:s0. Under a targeted SELinux policy, SSH is only permitted to read authorized_keys files that are labeled with the correct SELinux type, typically ssh_home_t.
Because SELinux is running in enforcing mode, it actively blocks access that violates policy rules, even if standard UNIX permissions are correct. Although the file permissions (600) are acceptable for an authorized_keys file, SELinux does not rely solely on traditional permissions. The mismatch between the expected SELinux context and the actual context prevents sshd from accessing the file, causing SSH to fall back to password authentication.
Option D correctly identifies the root cause: the authorized_keys file does not have the correct SELinux security context. This is a well-documented Linux+ V8 troubleshooting scenario, commonly resolved by restoring the correct context using commands such as restorecon or by ensuring the file resides in a properly labeled home directory.
The other options are incorrect. Restarting sshd does not fix SELinux labeling issues. The policy itself is functioning as intended, and file ownership alone does not override SELinux access controls.
Linux+ V8 documentation emphasizes that SELinux denials must be addressed by correcting file contexts rather than weakening security controls. Therefore, the correct answer is D.
NEW QUESTION # 21
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