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| Section | Weight | Objectives |
|---|---|---|
| Troubleshooting | 25% | - System and network troubleshooting
|
| Security | 25% | - System security and access control
|
| Scripting, Containers & Automation | 20% | - Automation and scripting
|
| System Management | 30% | - Linux installation, configuration, and system management
|
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NEW QUESTION # 83
Application owners are reporting that their application stops responding after several days of running, and they need to restart it. A Linux administrator obtains the following details from the dmesg command:
invoked oom-killer
Call Trace:
out_of_memory
oom_kill_process
The application owners mentioned that resources to the system have been increased, and the error takes longer to appear. Which of the following best describes the reason the process is being terminated by OOM?
Answer: C
Explanation:
The correct answer is C. The application might have a memory leak because the dmesg output clearly shows that the Linux kernel is invoking the OOM (Out Of Memory) killer, which terminates processes when the system runs out of available memory. The presence of entries such as invoked oom-killer, out_of_memory, and oom_kill_process confirms that the system is exhausting its memory resources over time.
A key detail in the scenario is that the application runs for several days before failing, and when system resources (RAM) are increased, the issue takes longer to occur. This behavior is a classic indicator of a memory leak, where an application gradually consumes more memory without releasing it. Instead of stabilizing, memory usage continuously grows until it reaches the system limit, at which point the OOM killer terminates the process to prevent system instability.
Option A (CPU type is incompatible) is incorrect because CPU incompatibility would cause immediate execution failures, not delayed memory exhaustion. Option B (kernel panic) is incorrect because a kernel panic would crash the entire system, not selectively terminate a user-space process. Option D (swap configuration not correctly sized) is partially plausible but not the best answer; while insufficient swap can contribute to OOM conditions, it does not explain the gradual memory consumption pattern observed.
In Linux+ troubleshooting, identifying memory leaks is critical when dealing with long-running applications.
Administrators should monitor memory usage using tools like top, htop, or ps, and investigate application behavior. Applying patches, optimizing code, or restarting services periodically are common mitigation strategies, along with configuring appropriate memory and swap resources.
NEW QUESTION # 84
An administrator needs to verify the user ID, home directory, and assigned shell for the user named "accounting." Which of the following commands should the administrator use to retrieve this information?
Answer: D
Explanation:
The getent passwd accounting command retrieves the user's entry from the system's password database, showing fields such as username, UID, GID, home directory, and assigned shell.
NEW QUESTION # 85
Users cannot access a server after it has been restarted. At the server console, the administrator runs the following commands:
Which of the following is the cause of the issue?
Answer: B
Explanation:
The server is running and responding to pings, and DNS resolves correctly (dig server1 →
192.168.0.2). The ss -lnt output shows SSH (port 22) is listening, but the firewall (firewall-cmd -- list-all) does not list SSH among the allowed services. Therefore, external users cannot connect because the firewall is blocking SSH.
NEW QUESTION # 86
Users report that after about a week, an application hosted in a system stops responding, requiring the system to be restarted to recover. A systems administrator connects to the system and obtains the following output:
Which of the following describes the reason the application stops responding?
Answer: C
Explanation:
The output shows memory and swap are fully consumed, and the kernel invoked the OOM killer against the application due to excessive resident memory usage, which is consistent with a memory leak gradually exhausting available RAM and swap until the application becomes unresponsive.
NEW QUESTION # 87
A Linux administrator needs to analyze a compromised disk for traces of malware. To complete the analysis, the administrator wants to make an exact, block-level copy of the disk. Which of the following commands accomplishes this task?
Answer: A
Explanation:
The dd command performs a low-level, block-by-block copy of a device. Using if=/dev/sdc (input file) and of=/tmp/image (output file) with a block size (bs) ensures an exact replica of the disk, suitable for forensic analysis.
NEW QUESTION # 88
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