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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Security | 21% | - Perform vulnerability assessments - Manage file security and access controls - Configure SELinux and security contexts - Manage firewalls - Apply best practices for permissions and authentication - Implement security hardening |
| Topic 2: Troubleshooting | 28% | - Troubleshoot security issues (SELinux, permissions) - Troubleshoot user issues - Monitor system logs, health, and events - Optimize performance (CPU, memory, I/O) - Troubleshoot application issues - Troubleshoot hardware issues - Troubleshoot network connectivity (firewall, routing, DNS) - Troubleshoot system properties and processes |
| Topic 3: Scripting, Containers, and Automation | 19% | - Implement automation workflows - Write and execute BASH shell scripts - Manage orchestration processes - Deploy and manage containers (Docker/Podman) - Manage version control using Git - Automate administration with Python and configuration management tools |
| Topic 4: System Management | 32% | - Configure storage and cloud/virtualization technologies - Perform basic Linux tasks - Manage system components - Manage storage - Manage networking - Manage the Linux boot process - Manage packages and software - Manage permissions and ownership - Manage users and groups - Manage kernel modules - Manage devices - Manage files and directories - Configure kernel modules and network parameters |
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NEW QUESTION # 114
A Linux systems administrator makes updates to systemd-managed service configuration files. Which of the following commands should the administrator execute in order to implement the changes?
Answer: A
Explanation:
In the systemd architecture, service configurations are stored in unit files (e.g., .service, .timer, .mount) located in directories like /etc/systemd/system/ or /usr/lib/systemd/system/. When an administrator modifies these files or creates new ones, the systemd manager does not automatically detect the changes. According to the CompTIA Linux+ V8 curriculum, the command systemctl daemon-reload is required to notify systemd that it needs to rescan the configuration directories and rebuild its internal dependency tree.
Without running daemon-reload, attempting to start or restart the service would result in systemd using the old, cached version of the unit file, or it might generate a warning stating that " the unit file on disk has changed. " This command is a safe operation that does not stop running services; it simply refreshes the manager ' s awareness of the current configuration.
The other options are insufficient for " implementing the changes " to the configuration files themselves.
systemctl enable (Option A) creates the links for starting the service at boot. systemctl start (Option B) attempts to launch the service. systemctl restart (Option C) stops and then starts a service, but if the unit file was changed and daemon-reload was not run, it may fail or use outdated settings.
Thus, systemctl daemon-reload is the essential first step after any modification to a systemd unit file.
NEW QUESTION # 115
A systems administrator wants to prevent the current contents of a file from being overwritten and wants to allow new additions at the end of the file. Which of the following commands should the administrator use?
Answer: D
Explanation:
The chattr +a command sets the append-only attribute on a file. This prevents overwriting or deletion of existing contents, while still allowing new data to be appended to the end of the file.
NEW QUESTION # 116
A Linux user needs to download the latest Debian image from a Docker repository. Which of the following commands makes this task possible?
Answer: D
Explanation:
Container management and image handling are part of modern Linux automation practices covered in CompTIA Linux+ V8. Docker images are stored in container registries such as Docker Hub, and administrators commonly need to download images to deploy containers.
The correct command for downloading an image from a Docker repository is docker image pull. This command retrieves the specified image from a configured container registry and stores it locally. When no tag is specified, Docker automatically pulls the latest available version of the image. Therefore, docker image pull debian downloads the most recent Debian image from Docker Hub.
The other options are incorrect. docker image init is not a valid Docker command and does not exist in Docker's CLI. docker image import is used to create a Docker image from a tarball file, not to download an image from a repository. docker image save exports an existing local image into a tar archive and does not retrieve images from a remote registry.
Linux+ V8 documentation emphasizes understanding container image lifecycles, including pulling, tagging, and running images. Pulling images is a foundational step before container execution and automation workflows.
Therefore, the correct answer is B. docker image pull debian.
NEW QUESTION # 117
The security manager at a company notifies a systems administrator of open vulnerabilities on the Linux system. The administrator receives the following information while logged in to the server:
$ date
Thu Jul 11 16:12:42 UTC 2024
$ getenforce
Enforcing
$ dnf history
ID | Command Line | Date and time | Action(s) | Altered
45 | update -y | 2023-07-09 | Update | 27
46 | install httpd | 2023-01-11 | Install | 9
47 | update -y | 2023-08-08 | Upgrade | 44
Which of the following is the most likely security concern?
Answer: D
Explanation:
Maintaining system security requires regular patching and updates to mitigate vulnerabilities. In this scenario, the administrator is presented with the current system date (July 11, 2024) and a history of package management transactions via the dnf history command. The last recorded update transaction (ID 47) occurred on August 8, 2023. This indicates that the system has gone nearly a full year without receiving security patches or software updates.
According to CompTIA Linux+ V8 security best practices, " unpatched systems " represent one of the most significant risks to an organization ' s infrastructure. New vulnerabilities (CVEs) are discovered constantly, and vendors release patches to address these flaws. A system that has not been updated in a year is likely susceptible to numerous exploits that have been patched in more recent software versions. Therefore, the primary security concern is the lack of recent updates.
The other options are not valid security concerns in this context. While httpd (Apache) may have vulnerabilities if unpatched, its mere presence (Option B) is not inherently a security concern if the service is required for business operations. Option C refers to the time zone configuration (UTC vs. EDT), which has no impact on system security. Option D suggests disabling SELinux; however, SELinux in " Enforcing " mode is actually a security best practice that provides Mandatory Access Control (MAC) to protect the system.
Disabling it would weaken the system ' s security posture rather than improve it.
The verified answer is that the server requires immediate patching due to the elapsed time since its last update.
NEW QUESTION # 118
A systems administrator wants to review the amount of time the NetworkManager service took to start. Which of the following commands accomplishes this goal?
Answer: D
Explanation:
System boot performance analysis is an important system management task included in Linux+ V8. When administrators need to determine how long services take to start during boot, systemd analysis tools are required.
The correct command is systemd-analyze blame. This command lists all systemd services and shows how long each one took to initialize during the boot process. It is commonly used to identify slow-starting services that may impact system startup performance, including NetworkManager.
The other options are incorrect. resolvectl is used for DNS resolution management and provides no service timing information. journalctl can display logs but does not provide a clear, summarized service startup timing report. systemctl daemon-reload only reloads systemd unit files and does not perform analysis.
Linux+ V8 documentation explicitly references systemd-analyze blame as the correct tool for diagnosing service startup delays. Therefore, the correct answer is D.
NEW QUESTION # 119
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