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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: System Management | 32% | - Manage users and groups - Manage devices - Manage files and directories - Manage packages and software - Configure storage and cloud/virtualization technologies - Manage the Linux boot process - Manage kernel modules - Manage system components - Manage permissions and ownership - Configure kernel modules and network parameters - Manage networking - Manage storage - Perform basic Linux tasks |
| Topic 2: Scripting, Containers, and Automation | 19% | - Manage orchestration processes - Manage version control using Git - Automate administration with Python and configuration management tools - Implement automation workflows - Write and execute BASH shell scripts - Deploy and manage containers (Docker/Podman) |
| Topic 3: Troubleshooting | 28% | - Troubleshoot user issues - Troubleshoot application issues - Monitor system logs, health, and events - Troubleshoot hardware issues - Troubleshoot network connectivity (firewall, routing, DNS) - Troubleshoot security issues (SELinux, permissions) - Troubleshoot system properties and processes - Optimize performance (CPU, memory, I/O) |
| Topic 4: Security | 21% | - Perform vulnerability assessments - Apply best practices for permissions and authentication - Manage file security and access controls - Implement security hardening - Configure SELinux and security contexts - Manage firewalls |
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NEW QUESTION # 117
A systems administrator needs to write a script that counts the number of times "FAIL" appears in a log file. If "FAIL" appears zero times, then the administrator would like to print the message
"SUCCESS." Given the following:
Which of the following should be used before the zero to complete the script?
Answer: C
Explanation:
The test should check if the count of "FAIL" equals zero. The operator -eq is used for numeric equality in shell conditionals, so [ $(grep -c FAIL /var/file.log) -eq 0 ] correctly evaluates whether the count is zero.
NEW QUESTION # 118
Which of the following best describes a benefit of using a Python virtual environment?
Answer: B
Explanation:
A Python virtual environment isolates project dependencies, allowing different projects to use different versions of the same package without interfering with each other.
NEW QUESTION # 119
A systems administrator needs to check the statuses of all the services on a Linux server. Which of the following commands accomplishes this task?
Answer: A
Explanation:
The systemctl list-units --type=service command displays all loaded service units and their statuses (running, exited, failed, etc.), allowing the administrator to check the state of all services on the server.
NEW QUESTION # 120
Which of the following can be implemented with PAM to detect and block dictionary attacks?
Answer: D
Explanation:
Pluggable Authentication Modules (PAM) provide a flexible, centralized mechanism for managing authentication across various services in a Linux system. According to the CompTIA Linux+ V8 security domain, protecting against " dictionary attacks " and " brute-force " attempts is a critical hardening step. A dictionary attack involves an automated script attempting thousands of common passwords against a user account.
To mitigate this, administrators use pam_tally2 (or the newer pam_faillock on some systems). The pam_tally2 module is specifically designed to keep track of failed login attempts for each user. It can be configured in the PAM stack (such as /etc/pam.d/common-auth or /etc/pam.d/password-auth) to lock an account after a specified number of consecutive failed attempts (e.g., deny=5). Once the threshold is reached, the user is blocked from further attempts for a set period or until an administrator manually resets the counter. This effectively stops automated dictionary attacks from continuing indefinitely.
The other options serve different purposes. pam_limits (Option B) is used to set resource limits (like CPU time or number of open files) for users once they are already logged in. pam_unix (Option C) is the standard module for traditional /etc/passwd and /etc/shadow authentication. pam_ldap (Option D) allows the system to authenticate against a remote LDAP directory.
While these modules are part of the PAM ecosystem, only pam_tally2 is designed for tracking and acting upon failed login counts to block attacks.
NEW QUESTION # 121
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:
$ uptime
12:47:43 up 22:17, 2 users, load average: 7.75, 5.72, 5.17
Which of the following is the most likely cause of the issue?
Answer: A
Explanation:
The correct answer is A. High CPU load because the uptime command output clearly shows elevated load averages (7.75, 5.72, 5.17), which indicate that the system is experiencing significant processing demand. Load average represents the number of processes that are either actively using the CPU or waiting for CPU time. When this value is consistently higher than the number of available CPU cores, it suggests that the CPU is overloaded and processes are being delayed.
In this scenario, the application is not completing tasks within the expected time frame, which aligns with CPU contention. When too many processes compete for CPU resources, scheduling delays occur, causing slower execution of applications and services. This is a common performance bottleneck in Linux systems.
NEW QUESTION # 122
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