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| Section | Objectives |
|---|---|
| Topic 1: System Troubleshooting and Performance | - Log analysis and diagnostics - Performance monitoring and optimization |
| Topic 2: Storage Management | - Advanced LVM configuration - Filesystem management and tuning |
| Topic 3: Networking and Security | - Network configuration and troubleshooting - Firewall and security controls |
| Topic 4: Advanced System Configuration and Administration | - System initialization and service management - Kernel parameters and tuning |
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NEW QUESTION # 48
Examine this output:
Last metadata expiration check: 4:30:21 ago on Mon 26 Oct 2020 03:09:52 PM GMT Installed Packages Name : gzip Version : 1.9 Release : 9.el8 Architecture : x86_64 Size : 412 k Source : gzip-1.9-9.el8.src.rpm Repository : @System From repo : anaconda Summary : The GNU data compression program URL :
http://www.gzip.org/
License : GPLv3+ and GFDL
Description : The gzip package contains the popular GNU gzip data compression program. Gzipped files have a .gz extension.
Gzip should be installed on your system, because it is a very
commonly used data compression program.
Which command generated it?
Answer: A
Explanation:
Thednf infocommand provides detailed information about an installed package. When used with the path of a binary (such as/usr/bin/gzip), it shows the package that provides the binary along with detailed information like the version, release, architecture, size, source, repository, summary, URL, and license.
NEW QUESTION # 49
Examine this network configuration:
NAME="ens4"
DEVICE="ens4"
ONBOOT=no
NETBOOT=yes
IPV6INIT=yes
BOOTPROTO=none
IPADDR=192.168.2.5
PREFIX=24
GATEWAY=192.168.2.1
TYPE=Ethernet
Which two statements are true after executing nmcli con mod ens4 ipv4.method auto?
Answer: A,E
NEW QUESTION # 50
Which mdadm command creates a RAID-1 device consisting of two block volumes and one spare device?
Answer: A
Explanation:
The correct command to create a RAID-1 device (mirroring) consisting of two block volumes with one spare device is optionC:mdadm -create /dev/md0 -level=1 -raid-devices=2 /dev/xvdd1 /dev/xvdd2 -spare- devices=1 /dev/xvdd3.
* RAID Level 1:RAID-1, also known as mirroring, involves creating an exact copy (or mirror) of a set of data on two or more disks. This ensures data redundancy; if one disk fails, the other can still provide the data.
* mdadm Command Structure:Themdadmcommand is used to manage and monitor RAID devices on Linux. To create a new RAID array, the--createoption is used, followed by several parameters:
* /dev/md0: The name of the RAID device to be created.
* --level=1: Specifies RAID level 1 (mirroring).
* --raid-devices=2: Indicates the number of active devices (two in this case) to be used in the RAID array.
* /dev/xvdd1 /dev/xvdd2: The two block devices that will form the RAID-1 array.
* --spare-devices=1 /dev/xvdd3: Specifies one spare device (/dev/xvdd3). A spare device is used to automatically replace a failed device in the RAID array.
* Option Analysis:
* A.Incorrect because it specifies RAID level 5 (--level=5), which requires at least three devices and does not match the requirement for RAID-1.
* B.Incorrect because it does not include the--spare-devices=1option, meaning there is no spare device included in this configuration.
* C.Correct as it specifies RAID-1 (--level=1), two active devices (--raid-devices=2), and one spare device (--spare-devices=1).
* D.Incorrect because it specifies RAID level 0 (--level=0), which is a striped set (no redundancy), not a mirrored set (RAID-1).
Oracle Linux Reference:For more detailed information aboutmdadmand RAID configurations in Oracle Linux
8, refer to the following Oracle Linux documentation:
* OracleLinux 8 Managing Storage Devices - RAID Configuration
* OracleLinux 8 mdadm Manual
These references provide comprehensive details on RAID levels,mdadmcommand syntax, and options for creating and managing RAID arrays in Oracle Linux.
NEW QUESTION # 51
As root you configured a file system using AutoFS with default settings. In the first session, you changed to a directory under AutoFS control. In a second session, you changed to /etc. Now the idle time for the session expires. Which two statements are true about the status of the file system mounted in the first session?
Answer: A,E
Explanation:
Understanding AutoFS Behavior:
* AutoFSautomatically mounts file systems when accessed and unmounts them after a period of inactivity (default is 5 minutes).
* A file system remains mounted as long as it isactive, meaning processes are accessing files or directories within it.
Scenario Analysis:
* First Session:
* Changed to a directory under AutoFS control (mount point is active).
* Second Session:
* Changed to /etc (does not affect the first session).
* Idle Time Expires:
* AutoFS checks for idle mounts to unmount.
Implications:
* The mount point remainsactivebecause the shell in the first session is in the AutoFS directory.
* AutoFS willnotunmount the file system while it is active.
Oracle Linux Reference:
* OracleLinux 8: Configuring File Systems-Using the Automounter:
"A file system remains mounted as long as there are open files or directories within it." Correct Options:
* Option B:The file system remains mounted until you log out from the first session.
* Option E:The file system remains mounted until you switch to a directory outside the current mount point.
Why Other Options Are Incorrect:
* Option A:Incorrect because the mount does not persist indefinitely; it's unmounted when no longer active.
* Option C:Incorrect because the mount is still active; the timer does not cause unmounting in this case.
* Option D:Incorrect because the second session does not influence the mount status in the first session.
NEW QUESTION # 52
Which two statements are true about the Linux Auditing System?
Answer: A,E
Explanation:
The Linux Auditing System can be configured to log various activities, including administrator attempts to access user home directories. Audit rules can be defined to monitor access to specific files or directories, and any access attempts will be logged in the audit logs.
Explanation of Answer B:Auditing system calls can generate a large amount of log data, which may affect system performance. The more detailed the audit rules, the greater the potential performance impact, as every event that matches a rule must be recorded.
NEW QUESTION # 53
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