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NEW QUESTION # 17
Examine this command and output:
# ausearch -k mkdir
type=SYSCALL msg=audit(1604360199.719:44733): arch=c000003e syscall=83 success=no a0=55dec0b47400 a1=lc0 a2=0 a3=0 items=2 ppid=1354 pid=284632 auid=4294967295 uid=996 gid=996 euid=998 suid=998 fsuid=998 egid=996 sgid=996 fsgid=996 tty=(none) ses=429 comm="pkla-check-auth" exe="/usr/bin/pkla-check-authorization" subj=system_u:system_r:policykit_auth_t:s0 key="mkdir" Which command displays the syscall in text format instead of numerical format?
- A. ausearch -r -k mkdir
- B. ausearch -I -k mkdir
- C. ausearch -a 83 -k mkdir
- D. ausearch --format text -k mkdir
- E. ausearch -sc 83 -k mkdir
Answer: E
NEW QUESTION # 18
Examine this command and output:
# mdadm --detail /dev/md0
/dev/md0:
Creation Time: Tue Oct 27 16:53:38 2020
Raid Level: raid5
Array Size: 207872 (203.03 MiB 212.86 MB)
Used Dev Size: 103936 (101.52 MiB 106.43 MB)
Raid Devices: 3
Total Devices: 3
Persistence : Superblock is persistent
Update Time: Tue Oct 27 16:53:38 2020
State: clean, degraded, recovering
Active Devices: 2
Working Devices: 3
Failed Devices: 0
Spare Devices: 1
Layout: left-symmetric
Chunk Size: 512K
Rebuild Status: 60% complete
Name: ol8.example.com:0 (local to host ol8.example.com)
UUID: 70f8bd2f:0505d92d:750a781e:c224508d
Events: 66
Number Major Minor RaidDevice State
0 8 49 0 active sync /dev/sdd1
1 8 65 1 active sync /dev/sde1
3 8 81 2 spare rebuilding /dev/sdf1
Which two are true?
- A. An extra device was added to this RAID set to increase its size.
- B. The RAID set read and write performance is currently sub-optimal.
- C. Only write performance is currently sub-optimal on this RAID set.
- D. A new RAID device was just added to replace a failed one.
- E. A RAID device failed and has returned to normal operating status.
Answer: B,D
NEW QUESTION # 19
Which two statements are true about fdisk?
- A. fdisk -l displays disk size information for all disks.
- B. It can divide logical devices into one or more block disks called partitions.
- C. It cannot partition disks larger than 2 TB by using a GPT partition table.
- D. It can partition disks larger than 2 TB by using a GPT partition table.
- E. It understands GPT, MBR, and HFS partition tables.
Answer: A,D
NEW QUESTION # 20
Examine this command:
# useradd -m -s /bin/bash alice
Which statement is true about the account?
- A. It is not assigned a home directory.
- B. It is a member of the wheel group.
- C. It is assigned a home directory and a password.
- D. It is assigned a shell but without a password.
Answer: D
NEW QUESTION # 21
Which mdadm command creates a RAID-1 device consisting of two block volumes and one spare device?
- A. mdadm -create /dev/md0 -level=0 -raid-devices=2 /dev/xvdd1 /dev/xvdd2 -spare-devices=1 /dev
/xvdd3 - B. mdadm -create /dev/md0 -level=1 -raid-devices=2 /dev/xvdd1 /dev/xvdd2
- C. mdadm -create /dev/md0 -level=1 -raid-devices=2 /dev/xvdd1 /dev/xvdd2 -spare-devices=1 /dev
/xvdd3 - D. mdadm -create /dev/md0 -level=5 -raid-devices=2 /dev/xvdd1 /dev/xvdd2 -spare-devices=1 /dev
/xvdd3
Answer: C
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 # 22
Which three are features of the btrfs file system?
- A. Online resizing
- B. Efficient storage for small files
- C. Automatic defragmentation
- D. Block devices mirroring
- E. Copy-on-write metadata
- F. Cluster file system
- G. General-purpose volume manager
Answer: A,C,E
Explanation:
* Option B (Correct):Btrfs uses a copy-on-write mechanism for both data and metadata, which ensures that the file system is more resilient to crashes and data corruption.
* Option E (Correct):Btrfs supports online resizing, meaning that you can change the size of a mounted Btrfs file system without unmounting it.
* Option G (Correct):Btrfs automatically defragments files in the background to maintain performance.
* Option A (Incorrect):While Btrfs does support mirroring, it is not strictly block device mirroring in the traditional sense like RAID; it uses a different approach to redundancy.
* Option C (Incorrect):Btrfs is not a cluster file system; it is designed for local file systems.
* Option D (Incorrect):While Btrfs can store small files efficiently, it is not its primary design goal compared to other file systems optimized specifically for small files.
* Option F (Incorrect):Btrfs is a file system with integrated volume management capabilities but is not a general-purpose volume manager like LVM.
Oracle Linux Reference:Refer to:
* OracleLinux 8: Btrfs File System
* man btrfsfor features and management.
NEW QUESTION # 23
Examine these commands and output:
# cat /etc/auto.master
/net -hosts
/- auto.direct ro
# cat /etc/auto.direct
/nfs1 host01:/export/share1
/nfs2 -sync host01:/export/share2
/nfs3 host02:/export/share3
Automounter must be used to mount these filesystems. Which mount options will it use?
- A. /nfs1 and /nfs3 are mounted read-only, async while /nfs2 is mounted read-only, sync.
- B. All three filesystems are mounted read-only, async.
- C. All three filesystems are mounted read-write, sync.
- D. /nfs1 and /nfs3 are mounted read-only, async while /nfs2 is mounted read-write, sync.
- E. All three filesystems are mounted read-only, sync.
Answer: A
NEW QUESTION # 24
Examine this content from /etc/chrony.conf:
...
pool pool.ntp.org offline
driftfile /var/lib/chrony/drift
keyfile /etc/chrony.keys
...
Which statement is true about pool.ntp.org?
- A. chronyd takes pool.ntp.org offline automatically when sending a request to the pool fails.
- B. chronyd does not poll pool.ntp.org until it is enabled to do so by chronyd.
- C. chronyd does not poll pool.ntp.org until it is enabled to do so by chronyc.
- D. chronyd polls a maximum of 3 sources from pool.ntp.org after it is enabled.
Answer: C
Explanation:
Explanation of Answer D:The entrypool pool.ntp.org offlinein the/etc/chrony.conffile specifies that thechronydservice should not automatically poll the NTP pool servers atpool.ntp.orguntil it is explicitly enabled by thechronyccommand. This setting is typically used in environments where the network is not always available (e.g., laptops or isolated systems) to avoid unnecessary polling.
NEW QUESTION # 25
Which two statements are true about the configuration and use of cron or anacron?
- A. anacron jobs may run only once a day.
- B. cron jobs may run only once a minute.
- C. anacron jobs are used to run cron jobs if the system was powered off when they were scheduled to run.
- D. All crontabs are held in the /etc/cron.d directory.
- E. The crond daemon looks for jobs only in /etc/crontab.
Answer: A,C
Explanation:
Option D: anacron jobs may run only once a day.
* Explanation:
* Anacronis designed for systems that are not running continuously (e.g., desktops or laptops that may be powered off at night). It ensures that scheduled tasks are executed at the specified intervals.
* Anacron jobs are defined with periods indays. The minimal unit of time for scheduling in Anacron isone day. Therefore, Anacron can schedule jobs to runonce a dayat most.
* It is not intended for tasks that need to run multiple times per day.
* Oracle Linux Reference:
* OracleLinux 8: Scheduling Tasks- Section onAnacron Configuration Files:
"Anacron is used to run commands periodically with a frequency specified in days." Option E: anacron jobs are used to run cron jobs if the system was powered off when they were scheduled to run.
* Explanation:
* Anacron complements Cron by ensuring thatscheduled jobs are not missedif the system is powered off or in standby mode at the time they were supposed to run.
* When the system boots up, Anacron checks for any scheduled jobs that did not run and executes them accordingly.
* This is particularly useful for laptops or desktops that are not always on.
* Oracle Linux Reference:
* OracleLinux 8: Scheduling Tasks- Section onUnderstanding Anacron:
"Anacron is designed to run commands periodically with specified frequency, but unlike cron, it does not assume that the system is running continuously." Why Other Options Are Not Correct:
* Option A:cron jobs may run only once a minute.
* Explanation:
* Cron allows scheduling tasks with a minimum granularity ofone minute. However, this means that tasks can be scheduled to runevery minute, not limited to only once a minute.
* Multiple cron jobs can be scheduled to run at the same minute.
* Therefore, the statement is misleading; cron jobs can runas frequently as every minute, but notonly once a minute.
* Option B:All crontabs are held in the /etc/cron.d directory.
* Explanation:
* The /etc/cron.d directory is used for system-wide cron jobs provided by packages or administrators.
* User-specific cron jobs are stored in /var/spool/cron/ or managed via the crontab command and not placed in /etc/cron.d.
* Additionally, the system crontab file is /etc/crontab, and there are also directories like /etc
/cron.hourly, /etc/cron.daily, etc.
* Option C:The crond daemon looks for jobs only in /etc/crontab.
* Explanation:
* The crond daemon checks multiple locations for scheduled jobs:
* User crontabs managed via the crontab -e command (stored in /var/spool/cron/).
* System-wide crontab file (/etc/crontab).
* The /etc/cron.d/ directory.
* The /etc/cron.hourly/, /etc/cron.daily/, /etc/cron.weekly/, and /etc/cron.monthly/ directories.
* Therefore, crond does not look for jobsonlyin /etc/crontab.
Conclusion:
OptionsDandEare correct because they accurately describe the characteristics and purposes of Anacron in the context of scheduling tasks on an Oracle Linux system.
NEW QUESTION # 26
Which two statements are true about container technology?
- A. Containers package an application with the individual runtime stack.
- B. A container application built on a bare metal system cannot run on virtual machines or cloud instances.
- C. A container application is dependent on the host operating system and kernel version.
- D. Podman requires a running daemon to function and to enable containers to start and run without root permissions.
- E. Podman, Buildah, and Skopeo are independent tools to create, run, and manage container applications across compatible Oracle Linux systems.
Answer: A,E
NEW QUESTION # 27
Examine this udev device naming rule which gets processed successfully:
makefile
KERNEL=="hdb", DRIVER=="ide-disk", SYMLINK+="sparedisk"
Which two statements are true?
- A. Symbolic link /dev/sparedisk is created linking to /dev/hdb and with an ide-disk device driver, thus overwriting existing symbolic links.
- B. The matching device will have the kernel device name /dev/hdb.
- C. Symbolic link /dev/sparedisk is created for a device named /dev/hdb or one that has an ide-disk device driver, whichever is discovered first.
- D. Symbolic link /dev/sparedisk is created for a device named /dev/hdb which has an ide-disk device driver if such a device is discovered.
- E. The matching device will be named /dev/sparedisk.
Answer: B,D
NEW QUESTION # 28
Examine this command:
# auditctl -w /etc/passwd -p w -k pass
Which two statements are true upon execution?
- A. An audit rule is defined that creates a log entry every time /etc/passwd is read.
- B. An audit rule is defined with the keyword pass.
- C. An audit is defined that creates a log entry every time a write occurs to /etc/passwd.
- D. A write occurs to /etc/audit/audit.rules.
- E. A write occurs to /etc/audit/rules.d/audit.rules.
Answer: B,C
Explanation:
* Option C (Correct):The-k passpart of theauditctlcommand defines a keyword (pass) for the audit rule.
This keyword helps in filtering and searching logs in the audit trail.
* Option D (Correct):The-w /etc/passwd -p wpart of the command sets up a watch on the/etc/passwdfile for write (w) operations. This audit rule will generate a log entry every time there is a write operation to
/etc/passwd.
* Option A (Incorrect):This command does not write directly to/etc/audit/rules.d/audit.rules; it defines a rule in memory that could be saved to this file later.
* Option B (Incorrect):The rule only logs write (w) operations; it does not log read operations.
* Option E (Incorrect):The command does not directly cause a write to/etc/audit/audit.rules.
Oracle Linux Reference:Refer to:
* OracleLinux 8: Auditing and System Logs
* man auditctlfor details on audit rules and options.
NEW QUESTION # 29
Which two directories store PAM authentication modules?
- A. /usr/lib
- B. /lib64/security
- C. /var/lib
- D. /lib/security
- E. /etc/pam.d
Answer: B,D
Explanation:
* Option A (Correct):/lib64/securityis a common directory where PAM (Pluggable Authentication Module) libraries are stored for 64-bit systems.
* Option D (Correct):/lib/securityis another directory where PAM libraries are stored, usually on 32-bit systems or as a fallback for 64-bit systems.
* Option B (Incorrect):/etc/pam.dcontains configuration files for PAM modules but does not store the modules themselves.
* Option C (Incorrect):/usr/libis a general directory for libraries but does not specifically store PAM modules.
* Option E (Incorrect):/var/libis typically used for variable state information and is not relevant for storing PAM modules.
Oracle Linux Reference:Refer to:
* OracleLinux 8: Managing Authentication
NEW QUESTION # 30
Which two features does a user private group provide?
- A. Ability for only a group's users to read files in a new directory
- B. Capability to prevent other users from modifying a file
- C. Provision of a unique group.
- D. Capability to create new group users
- E. Capability to execute sudo
Answer: B,C
NEW QUESTION # 31
Which mdadm command creates a RAID-1 device consisting of two block volumes and one spare device?
- A. mdadm -create /dev/md0 -level=1 -raid-devices=2 /dev/xvdd1 /dev/xvdd2 -spare-devices=1 /dev/xvdd3
- B. mdadm -create /dev/md0 -level=0 -raid-devices=2 /dev/xvdd1 /dev/xvdd2 -spare-devices=1 /dev/xvdd3
- C. mdadm -create /dev/md0 -level=1 -raid-devices=2 /dev/xvdd1 /dev/xvdd2
- D. mdadm -create /dev/md0 -level=5 -raid-devices=2 /dev/xvdd1 /dev/xvdd2 -spare-devices=1 /dev/xvdd3
Answer: A
NEW QUESTION # 32
Which two statements are true about the Linux Auditing System?
- A. Auditing includes security policies, each of which includes security rules, or checks, which are checked when you run a security scan.
- B. Auditing can scan for Common Vulnerabilities and Exposures (CVE) and automatically apply needed patches to a system.
- C. Auditing modes include permissive, enforcing, and disabled.
- D. Auditing rules can log administrator attempts to access user home directories.
- E. Auditing system call rules can affect system performance depending on the amount of information that is logged.
Answer: D,E
NEW QUESTION # 33
Which two default user account settings are contained in /etc/login.defs?
- A. Group hashed passwords.
- B. Encryption method used to encrypt passwords.
- C. Decryption method used to decrypt passwords.
- D. User hashed passwords.
- E. Password aging controls.
Answer: B,E
Explanation:
Explanation of Answer D:The/etc/login.defsfile in Oracle Linux contains configuration settings related to user account policies, including password aging controls. This includes settings such asPASS_MAX_DAYS, PASS_MIN_DAYS, andPASS_WARN_AGE, which define the maximum number of days a password is valid, the minimum number of days between password changes, and the number of days before password expiration to warn users, respectively.
Explanation of Answer E:The/etc/login.defsfile also contains settings for the encryption method used to encrypt user passwords. TheENCRYPT_METHODparameter specifies the hashing algorithm, such as SHA512, that is used to encrypt user passwords stored in/etc/shadow.
NEW QUESTION # 34
Examine this command:
# cryptsetup luksOpen /dev/xvdd1 cryptfs
What happens upon execution?
- A. It creates the LUKS partition on /dev/xvdd1.
- B. It creates the /dev/mapper/xvdd1 device mapping file.
- C. It creates the /dev/mapper/xvdd1/cryptfs device mapping file.
- D. It creates the /dev/mapper/xvdd1-cryptfs device mapping file.
- E. It creates the /dev/mapper/cryptfs device mapping file.
Answer: E
Explanation:
The commandcryptsetup luksOpen /dev/xvdd1 cryptfsis used to open an encrypted LUKS partition. This command maps the encrypted block device/dev/xvdd1to a decrypted block device that is accessible under/dev
/mapper/cryptfs.
* Option A (Correct):This is correct because thecryptsetup luksOpencommand creates a device mapping under/dev/mapper/with the name specified (cryptfsin this case). This mapping allows you to access the encrypted content of/dev/xvdd1through the decrypted virtual device/dev/mapper/cryptfs.
* Options B, C, D, E (Incorrect):These options are incorrect because they do not accurately reflect the standard behavior of thecryptsetup luksOpencommand. The device created will always be in the format
/dev/mapper/<name>where<name>is the alias specified in the command.
Oracle Linux Reference:For more information, refer to:
* OracleLinux 8: Managing Storage Devices
* man cryptsetupfor more details on theluksOpencommand and LUKS management.
NEW QUESTION # 35
Examine this command:
# ssh -L 5011:127.0.0.1:80 [email protected] -f sleep 30
Which two are true upon execution?
- A. A web server is listening on port 5011.
- B. A socket remains open for 30 minutes unless a connection is established.
- C. A reverse tunnel is created back to the local host on port 80.
- D. An SSH connection process is forked to the background.
- E. A local port forward is created between client and server.
Answer: D,E
Explanation:
Explanation of Answer B:The commandssh -L 5011:127.0.0.1:80 [email protected] -f sleep 30creates a local port forward. This means port5011on the client machine is forwarded to port80on the remote machine (10.10.2.20) using the SSH connection.
Explanation of Answer E:The-foption of thesshcommand causes the SSH connection process to fork to the background after authentication is complete. Thesleep 30command keeps the SSH connection alive for 30 seconds.
NEW QUESTION # 36
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Oracle 1Z0-106 exam is beneficial for professionals who are looking to enhance their skills in Linux system administration. Oracle Linux 8 Advanced System Administration certification is recognized globally and validates the candidate's expertise in managing and configuring advanced features of Oracle Linux 8. Having this certification on their resume can help professionals to secure better job prospects and higher salaries.
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