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178. Frage
A Linux administrator is attempting to capture all network traffic coming to the server from the
10.0.6.5 IP address. Which of the following commands should the administrator run on the server to achieve the goal?
Antwort: A
Begründung:
tcpdump host 10.0.6.5applies a Berkeley Packet Filter that matches any packets to or from the IP 10.0.6.5, capturing all traffic involving that host. The netqualifier is for entire subnets, ip isn't a valid filter keyword by itself, and addris not recognized in tcpdump's filter syntax.
179. Frage
A systems administrator needs to integrate a new storage array into the company's existing storage pool. The administrator wants to ensure that the server is able to detect the new storage array. Which of the following commands should the administrator use to ensure that the new storage array is presented to the systems?
Antwort: D
Begründung:
Comprehensive and Detailed Explanation From Exact Extract:
The lsscsi command is used to list information about SCSI devices (including storage arrays) that are attached to the system. This is critical when integrating a new storage array because it allows the administrator to verify that the operating system detects the new device at the SCSI layer, which is the underlying interface for most enterprise storage solutions. lsscsi outputs a list of recognized SCSI devices, their device nodes, and associated information.
Other options:
* B. lsusb: Lists USB devices, not storage arrays on SCSI/SATA/SAS.
* C. lsipc: Displays information on IPC (inter-process communication) facilities, unrelated to hardware detection.
* D. lshw: Lists hardware details and can show storage, but lsscsi is specifically designed for SCSI device detection and is the most direct method for this task.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 7: "Managing Storage", Section:
"Identifying and Accessing Storage Devices"
CompTIA Linux+ XK0-006 Objectives: Domain 4.0 - Storage and Filesystems
180. Frage
A Linux administrator attempts to log in to a server over SSH as root and receives the following error message: Permission denied, please try again. The administrator is able to log in to the console of the server directly with root and confirms the password is correct. The administrator reviews the configuration of the SSH service and gets the following output:
Based on the above output, which of the following will most likely allow the administrator to log in over SSH to the server?
Antwort: C
Begründung:
The SSH configuration option PermitRootLogin prohibit-password prevents the root user from logging in with password authentication. This setting means root cannot use a password to log in via SSH; only key-based authentication is permitted for root. The administrator can still log in as root locally, which is not affected by this SSH configuration. To allow SSH access as root, the administrator must use an SSH key instead of a password.
181. Frage
Which of the following is the first step when starting a new Python project on a Linux system?
Antwort: B
Begründung:
The correct answer is A. python -m venv /path/to/project because creating a virtual environment is the recommended first step when starting a new Python project. A virtual environment isolates project dependencies from the system-wide Python installation, ensuring that libraries and package versions do not conflict with other projects or system components.
The command python -m venv /path/to/project creates a self-contained directory that includes its own Python interpreter, libraries, and scripts. This allows developers and administrators to install packages specific to the project without affecting the global environment. After creating the virtual environment, the next steps typically include activating it (e.g., source /path/to/project/bin/activate) and then installing dependencies using pip.
Option B (python -m pip install -r /path/to/project) is incorrect because installing dependencies from a requirements file assumes that a virtual environment or project structure is already in place. It is not the first step.
Option C (export PYTHON_PATH=/path/to/project) is incorrect because setting PYTHONPATH only modifies where Python looks for modules. It does not create an isolated environment or manage dependencies.
Option D (python -m source /path/to/project) is incorrect because source is a shell built-in command used to activate environments, not a Python module, and this syntax is invalid.
From a Linux+ perspective, using virtual environments aligns with best practices in automation and scripting.
It ensures consistency, reproducibility, and isolation of development environments, which is critical for deployment, testing, and maintaining Python-based applications.
182. Frage
A Linux administrator receives reports about MySQL service availability issues. The administrator observes the following information:
uptime -p shows the system has been up for only 2 minutes
journalctl shows messages indicating:
mysqld invoked oom-killer
mysqld cpuset=/ mems_allowed=0
Which of the following explains why the server was offline?
Antwort: A
Begründung:
This scenario clearly indicates a memory exhaustion condition, which falls under the Troubleshooting domain of the CompTIA Linux+ V8 objectives. The most critical clue is the log entry stating that mysqld invoked oom-killer.
The OOM (Out-Of-Memory) killer is a Linux kernel mechanism that activates when the system runs critically low on available memory and cannot satisfy memory allocation requests. When this happens, the kernel selects a process-typically one consuming a large amount of memory-and forcibly terminates it to protect overall system stability. In this case, the MySQL daemon (mysqld) was identified as the process responsible for triggering the OOM condition.
The journalctl output explicitly confirms this behavior. Linux+ V8 documentation emphasizes that when the OOM killer is invoked, it is almost always due to physical memory exhaustion or insufficient swap space, not user intervention or application bugs alone. The additional log line showing mems_allowed=0 further supports the conclusion that the process could not allocate memory from available memory nodes.
The fact that uptime -p reports only 2 minutes of uptime strongly suggests that the system was either rebooted automatically or manually following the memory exhaustion event. Systems may reboot as part of recovery procedures after severe resource exhaustion, especially in production environments.
The other options can be ruled out. There is no indication of a user-initiated kill signal, filesystem corruption, or network connectivity issues. Network outages would not generate OOM killer messages, and filesystem errors would appear as I/O or disk-related errors in the logs.
Linux+ V8 best practices recommend addressing OOM issues by increasing system memory, tuning MySQL memory parameters, configuring swap space, or adjusting OOM scoring.
Therefore, the correct explanation is A. The process exhausted server memory.
183. Frage
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