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68. Frage
A newly hired Linux administrator needs to grant access to the Linux servers by generating a password-protected RSA key of 4096 bytes. Which of the following commands will accomplish this task?
Antwort: C
Begründung:
The ssh-keygencommand is used to generate SSH key pairs.
To generate an RSA key with a length of 4096 bits, the correct syntax is:
* -t rsa: Specifies the type of key to generate, which is RSA.
* -b 4096: Specifies the number of bits for the key, in this case 4096.
By running this command, the user will be prompted to enter a passphrase to password-protect the key, which satisfies the requirement for generating a password-protected RSA key of 4096 bits.
69. 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-killermysqld cpuset=/ mems_allowed=0 Which of the following explains why the server was offline?
Antwort: D
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.
70. Frage
An administrator needs to create a new logical volume from sets of provisioned disks. Which of the following shows the correct order of commands the administrator should execute?
Antwort: C
Begründung:
Logical Volume Management (LVM) is a fundamental storage management concept in CompTIA Linux+ V8. LVM provides a layered abstraction between physical storage devices and the filesystems used by the operating system. To successfully provision a new logical volume, an administrator must follow a strict hierarchy of operations:
pvcreate (Physical Volume): This is the first step. The administrator must initialize the raw physical disks or partitions for use by LVM. This command writes LVM metadata to the disk, making it a "Physical Volume" (PV).
vgcreate (Volume Group): In the second step, the administrator combines one or more Physical Volumes into a single storage pool called a "Volume Group" (VG). The VG acts like a virtual disk drive created from the combined capacity of the underlying PVs.
lvcreate (Logical Volume): Finally, the administrator carves out space from the Volume Group to create "Logical Volumes" (LV). These LVs act like partitions and are where the administrator will actually create a filesystem (e.g., mkfs.ext4) and mount it for use.
This order is mandatory because each layer depends on the existence of the one below it. You cannot create a VG without PVs, and you cannot create an LV without a VG.
Therefore, the sequence pvcreate -> vgcreate -> lvcreate is the verified and only correct order of execution.
71. Frage
A systems administrator is configuring new Linux systems and needs to enable passwordless authentication between two of the servers. Which of the following commands should the administrator use?
Antwort: A
Begründung:
ssh-keygen -t rsa generates an RSA key pair.
ssh-copy-id -i ~/.ssh/id_rsa.pub john@server2 copies the public key to the remote server's authorized_keys, enabling passwordless login.
72. Frage
Which of the following commands should a Linux administrator use to determine the version of a kernel module?
Antwort: A
Begründung:
Kernel module management is an important part of Linux system administration and is covered in the Linux+ V8 objectives. When an administrator needs to determine metadata about a kernel module-such as its version, author, description, license, filename, and dependencies-the correct tool is modinfo.
The command modinfo bluetooth displays detailed information about the specified kernel module, including the module version if it is defined. This makes it the correct and intended command for retrieving version details of kernel modules, whether or not the module is currently loaded.
The other options are incorrect. modprobe bluetooth is used to load or unload kernel modules and does not display version information. lsmod lists loaded modules but does not show version details and does not accept module names as arguments in that manner. depmod is used to generate module dependency information and does not provide module metadata to the administrator.
Linux+ V8 documentation specifically references modinfo as the utility for inspecting kernel module properties. This command is essential for troubleshooting driver issues, verifying compatibility, and auditing kernel components.
Therefore, the correct answer is D. modinfo bluetooth.
73. Frage
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