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| Section | Weight | Objectives |
|---|---|---|
| Security | 18% | - System hardening and compliance
|
| Automation and Scripting | 17% | - Containers, orchestration, and cloud integration
|
| Troubleshooting | 22% | - System and hardware issues
|
| System Management | 23% | - Installation, configuration, and maintenance
|
| Services and User Management | 20% | - Service configuration and operation
|
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NEW QUESTION # 31
Users cannot access an application that is running inside containers. The administrator wants to validate whether the containers are running. Which of the following commands should the administrator use?
Answer: D
Explanation:
Container troubleshooting is a key competency within the Automation, Orchestration, and Scripting domain of CompTIA Linux+ V8. When users report that an application running inside containers is not accessible, one of the first validation steps is to confirm whether the containers are currently running.
The docker ps command is specifically designed to list running containers on the system. By default, it displays container IDs, image names, command executed, uptime, port mappings, and container names. This allows administrators to quickly determine whether the application container is active and whether it is exposing the expected ports. This aligns directly with Linux+ V8 guidance on container lifecycle management and operational validation.
The other options are not suitable for this purpose. docker start is used to start one or more stopped containers but does not display container status. docker run creates and starts a new container, which is not appropriate when the goal is only to check the status of existing containers. docker images lists locally available container images but provides no information about running or stopped containers.
Linux+ V8 documentation emphasizes the importance of using the correct Docker subcommands when diagnosing containerized applications. Verifying container runtime state using docker ps is a foundational troubleshooting step before investigating networking, firewall rules, or application-level errors.
Therefore, the correct command to validate whether containers are running is docker ps, making Answer B correct.
NEW QUESTION # 32
A systems administrator receives reports about connection issues to a secure web server. Given the following firewall and web server outputs:
Which of the following commands best resolves this issue?
Answer: B
Explanation:
The firewall output shows that port 443/tcp (HTTPS) is explicitly denied, even though the web server is correctly listening on it. Removing the deny rule for HTTPS (ufw delete deny https/tcp) resolves the issue while still keeping the firewall active and secure.
NEW QUESTION # 33
A Linux administrator needs to create accounts for a list of new users. The user account names have been defined in the USER_LIST variable by executing the following:
USER_LIST= " alice bob charles "
Which of the following commands should the administrator use to successfully create the user accounts?
Answer: D
Explanation:
The correct answer is D. for username in $USER_LIST; do useradd -m " $username " ; done because it correctly iterates through each value in the USER_LIST variable and executes the useradd command for each user. In Bash scripting, a for loop is the most appropriate and commonly used construct for iterating over a list of space-separated values stored in a variable.
The variable USER_LIST= " alice bob charles " contains three usernames separated by spaces. When used in a for loop, Bash automatically splits the string into individual words, assigning each value to the variable username during each iteration. The useradd -m command then creates a new user account and also generates a home directory for each user, which is standard practice in Linux system administration.
Option A is incorrect because the syntax is invalid; a while loop requires a conditional expression or a read statement to process input, which is missing here. Option B is also incorrect because until loops require a condition and are not suitable for iterating over lists in this way. Option C is incorrect because the select statement is used for interactive menu-based selection, not for non-interactive batch processing, and quoting
$USER_LIST would treat the entire string as a single item.
From a Linux+ perspective, understanding shell scripting constructs such as loops is essential for automation and user management tasks. The for loop provides a simple and efficient way to perform repetitive administrative operations, such as creating multiple user accounts, ensuring consistency and saving time in system provisioning.
NEW QUESTION # 34
Due to application compatibility issues, the Python 3 OpenSSL library should not be upgraded. Which of the following commands should the systems administrator use to ensure the package stays at the current version?
Answer: B
Explanation:
Package management is a critical system management task covered extensively in the Linux+ V8 objectives.
On Debian-based systems (like Ubuntu), administrators often need to " pin " or " hold " a specific package version to prevent it from being automatically updated during a general system upgrade (apt upgrade). This is commonly done to avoid breaking applications that have strict version dependencies.
The modern and most direct way to accomplish this is using the apt-mark utility. The command apt-mark hold
< package_name > marks the package as " on hold " in the package manager database. Once a package is on hold, apt will skip it during upgrades until an administrator explicitly runs apt-mark unhold.
While Option D (echo " package hold " | dpkg --set-selections) is a valid legacy method, apt-mark hold (Option C) is the preferred and more user-friendly standard in contemporary Linux administration. Option A has incorrect syntax for dpkg. Option B uses a non-existent command (set-selections is a sub-module of dpkg, not apt).
Therefore, apt-mark hold is the verified correct answer for ensuring a package remains at its current version.
NEW QUESTION # 35
A Linux administrator receives reports that an application hosted in a system is not completing tasks in the allocated time. The administrator connects to the system and obtains the following details:
Which of the following actions can the administrator take to help speed up the jobs?
Answer: C
Explanation:
The uptime output shows a load average of 7.75, 5.72, 5.17 on a system with only 4 processors (nproc = 4). This indicates CPU saturation since the load averages are significantly higher than the number of available CPUs. Memory and swap usage are minimal, and vmstat shows no I/O waits, so the bottleneck is CPU. Increasing CPU resources will help speed up the jobs.
NEW QUESTION # 36
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