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| Section | Weight | Objectives |
|---|---|---|
| System Management | 32% | - Manage system components - Manage devices - Manage storage - Manage files and directories - Manage kernel modules - Configure storage and cloud/virtualization technologies - Manage permissions and ownership - Configure kernel modules and network parameters - Perform basic Linux tasks - Manage users and groups - Manage packages and software - Manage the Linux boot process - Manage networking |
| Troubleshooting | 28% | - Troubleshoot system properties and processes - Troubleshoot application issues - Troubleshoot security issues (SELinux, permissions) - Troubleshoot user issues - Monitor system logs, health, and events - Troubleshoot hardware issues - Optimize performance (CPU, memory, I/O) - Troubleshoot network connectivity (firewall, routing, DNS) |
| Security | 21% | - Manage file security and access controls - Apply best practices for permissions and authentication - Perform vulnerability assessments - Implement security hardening - Manage firewalls - Configure SELinux and security contexts |
| Scripting, Containers, and Automation | 19% | - Deploy and manage containers (Docker/Podman) - Manage version control using Git - Manage orchestration processes - Automate administration with Python and configuration management tools - Write and execute BASH shell scripts - Implement automation workflows |
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질문 # 87
A Linux administrator needs to create and then connect to the app-01-imagecontainer. Which of the following commands accomplishes this task?
정답：B
설명：
The docker run -it command both creates a new container from the specified image and attaches to it interactively, which is exactly what the administrator needs.
질문 # 88
A user states that an NFS share Is reporting random disconnections. The systems administrator obtains the following information
Which of the following best explains the symptoms that are being reported?
정답：A
설명：
This issue is best analyzed using a layered troubleshooting approach, as recommended in the Troubleshooting domain of CompTIA Linux+ V8. The reported symptom is intermittent or random disconnections from an NFS share, which commonly indicates a network reliability issue rather than a configuration or filesystem problem.
The most critical evidence comes from the output of ip -s link show. The network interface enp1s0 is reporting significant numbers of errors and dropped packets on both the receive (RX) and transmit (TX) paths. High packet loss at the network interface level directly affects protocols like NFS, which rely on stable, continuous TCP/IP communication. When packets are dropped or corrupted, NFS clients may experience timeouts, retransmissions, and apparent disconnections.
Although the df -h output shows that the NFS filesystem is 95% full, this alone does not typically cause random disconnections. A nearly full filesystem may lead to write failures or performance degradation, but it does not explain intermittent connectivity loss. Linux+ V8 documentation notes that filesystem capacity issues usually present as I/O errors, not transport-layer disconnects.
Options A and B can also be ruled out. If the mount point or IP address were incorrect, the NFS share would fail consistently rather than intermittently. The fact that the share is mounted and accessible confirms that the mount configuration and IP addressing are correct.
Linux+ V8 emphasizes that NFS performance and reliability are highly sensitive to network quality. Packet errors, drops, faulty NICs, cabling issues, duplex mismatches, or driver problems commonly result in unstable NFS behavior.
Therefore, the best explanation for the reported random disconnections is D. The interface is reporting a high number of errors and dropped packets.
질문 # 89
Which of the following commands is used to ensure a service starts automatically at boot on a system using systemd?
정답：A
설명：
The correct answer is B. systemctl enable httpd because it configures a service to start automatically during system boot in systems that use systemd as the init system. The enable command creates the necessary symbolic links between the service unit file and the appropriate target (such as multi-user.target), ensuring the service is launched when the system starts.
In Linux systems managed by systemd, services are controlled using the systemctl command. While systemctl start httpd (Option A) will immediately start the service, it does not persist across reboots. This means that after a system restart, the service would not automatically run unless it has been explicitly enabled.
Option C (systemctl status httpd) is used to check the current status of the service, including whether it is running, stopped, or failed, along with logs and other diagnostic information. It does not modify the service behavior.
Option D (systemctl reload httpd) is used to reload the service configuration without stopping it, typically after making configuration changes. It does not affect whether the service starts at boot.
From a Linux+ Services and User Management perspective, understanding the distinction between starting and enabling services is critical. Administrators must ensure that essential services, such as web servers or databases, are configured to start automatically to maintain system availability. The systemctl enable command is the correct method for achieving persistent service startup behavior in systemd-based systems.
질문 # 90
Which of the following most accurately describes a webhook?
정답：C
설명：
The correct answer is D. An HTTP-based callback function. A webhook is a mechanism that allows one system to automatically send real-time data to another system via HTTP when a specific event occurs. Instead of continuously polling an API for updates, a webhook enables event-driven communication, making automation more efficient and responsive.
In practical Linux and DevOps environments, webhooks are widely used in automation, orchestration, and integration workflows. For example, a version control system like GitHub can trigger a webhook to notify a CI
/CD pipeline whenever new code is pushed. The receiving system exposes an HTTP endpoint (URL), and when the event occurs, the webhook sends an HTTP POST request with relevant data payload. This design significantly reduces overhead compared to polling mechanisms.
Option A is incorrect because webhooks are not authentication mechanisms. While authentication (such as tokens or signatures) may be used to secure webhook communication, it is not their primary purpose.
Option B is incorrect because SNMP (Simple Network Management Protocol) is unrelated to webhooks.
SNMP is used for monitoring and managing network devices, whereas webhooks operate over HTTP/HTTPS protocols.
Option C is incorrect because although webhooks can transmit data (including sensitive information if not properly secured), their purpose is not specifically to transmit sensitive data but to notify systems of events through automated callbacks.
From a Linux+ perspective, understanding webhooks is essential in automation and orchestration tasks. They are commonly integrated into scripts, configuration management tools, and cloud-native workflows to enable reactive, event-driven system behavior, improving efficiency and scalability in modern infrastructure environments.
질문 # 91
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, and not all 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.
정답：
설명：
see the solution in Explanation below.
Explanation:
This performance-based question tests correct use of the tar utility for backup and restore operations, which is part of System Management in CompTIA Linux+ V8. The key detail is that the backup is explicitly described as uncompressed, so the correct archive file must be a plain .tar file rather than .tar.gz, .tgz, or .tar.bz2.
For the backup command, the correct syntax is:
tar -cvf /backups/application.tar -C /opt/ application
Here, -c creates the archive, -v enables verbose output, and -f specifies the archive filename. The -C /opt/ option changes to the /opt/ directory before archiving, and application is then archived relative to that location. This is the correct Linux+ method because it avoids storing unnecessary leading path components in the archive.
For the restore command, the correct syntax is:
tar -xvf /backups/application.tar -C /opt/
Here, -x extracts the archive, -v displays files being restored, and -f identifies the archive file. The -C /opt/ option ensures the archived application directory is restored back into /opt/, recreating /opt/application correctly.
The other file choices such as /backups/application.tar.gz, /backups/application.tgz, and /backups/application.
tar.bz2 are incorrect because they indicate compressed backups, which the question specifically rules out.
Likewise, options such as -xzvf or -xjvf are used for gzip- or bzip2-compressed archives and would not apply here.
Therefore, the verified correct PBQ answers are:
Backup: tar -cvf /backups/application.tar -C /opt/ application
Restore: tar -xvf /backups/application.tar -C /opt/
질문 # 92
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