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Earning the Oracle Linux 8 Advanced System Administration certification demonstrates to employers and clients that you have the expertise and skills required to administer and manage Oracle Linux 8 systems effectively. It is a valuable credential for Linux administrators who work with Oracle technologies and want to advance their careers in this field.
Oracle 1Z0-106 exam, also known as Oracle Linux 8 Advanced System Administration, is designed for IT professionals who are seeking to validate their expertise in advanced system administration tasks on Oracle Linux 8. 1z1-106 exam is part of the Oracle Certified Professional program and is intended for individuals who have a solid understanding of Linux administration and are looking to expand their skill set specifically in relation to Oracle Linux 8. 1z1-106 exam covers a variety of topics including installation and configuration, networking, security, storage management, and advanced system administration tasks such as kernel management, virtualization, and automation.
Oracle 1Z0-106 certification exam is designed for IT professionals who are seeking to validate their advanced system administration skills on the Oracle Linux 8 platform. 1z1-106 exam is a highly sought-after certification in the industry, especially for those who are looking to enhance their career prospects in the field of Linux system administration.
NEW QUESTION # 30
Which command produces human-readable timestamps in kernel ring buffer messages?
- A. dmesg -x
- B. dmesg -t
- C. dmesg -T
- D. dmesg -W
Answer: C
NEW QUESTION # 31
Which two statements are true about control groups (cgroups) in Oracle Linux 8?
- A. A cgroup is a collection of processes bound to a set of limits or parameters defined in the cgroups filesystem.
- B. Oracle Linux 8 implements cgroups v2 by default.
- C. The cgroups filesystem allows limits to be overwritten in the lower levels of the hierarchy.
- D. Different controllers from cgroups version 1 and cgroups version 2 cannot be used at the same time.
- E. Cgroups allow processes to be organized into hierarchical groups whose resource usage cannot be limited and monitored.
Answer: A,B
NEW QUESTION # 32
Which two features does a user private group provide?
- A. Provision of a unique group.
- B. Capability to prevent other users from modifying a file
- C. Ability for only a group's users to read files in a new directory
- D. Capability to execute sudo
- E. Capability to create new group users
Answer: A,B
Explanation:
* Option A (Correct):A user private group (UPG) ensures that each user has their own unique group created with the same name and ID as the user.
* Option E (Correct):The UPG model helps prevent other users from modifying files by default, as newly created files are assigned to the user's unique group and not to a shared group.
* Option B (Incorrect):UPG does not give the capability to create new group users; this is related to group management commands.
* Option C (Incorrect):UPG does not providesudocapabilities;sudoconfiguration is managed separately.
* Option D (Incorrect):UPGs do not limit reading files to group users by default; it depends on specific file permissions.
Oracle Linux Reference:Refer to:
* OracleLinux 8: Managing Users and Groups
NEW QUESTION # 33
You must add an additional swap device and you add this entry to /etc/fstab:
/.swapfile none swap defaults 0 0
Examine these commands and output:
# dd if=/dev/zero of=/.swapfile bs=1024 count=1048576
1048576+0 records in
1048576+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 4.32499 s, 248 MB/s
# swapon -a
swapon: /.swapfile: insecure permissions 0644, 0600 suggested.
swapon: /.swapfile: read swap header failed
Which two actions must you perform to add this swap device?
- A. Assign a label to the .swapfile file by using the swaplabel command.
- B. Execute swapon -L swapfile /.swapfile after adding a label.
- C. Use a physical disk partition type of 82 (Linux swap).
- D. Execute swapon -all.
- E. Change defaults to user in the /etc/fstab entry.
- F. Initialize the .swapfile file by using the mkswap command.
Answer: E,F
NEW QUESTION # 34
Examine this command and output:
$ ftp host01.example.com
Connected to host01.example.com (192.168.40.131).
220 (vsFTPd 3.0.2)
Name (host01.example.com:oracle):
After entering a carriage return, this error message is displayed:
530 Permission denied
Login Failed
ftp>
Why is the oracle user denied access to the FTP server on host01.example.com?
- A. The oracle user is listed in /etc/vsftpd/ftpusers.
- B. LOCAL_ENABLE is set to NO in /etc/vsftpd/vsftpd.conf.
- C. The oracle user is listed in /etc/vsftpd/user_list and USERLIST_ENABLE is set to YES in /etc/vsftpd
/vsftpd.conf. - D. The oracle user does not exist on host01.example.com.
- E. The oracle user is listed in /etc/vsftpd/user_list and USERLIST_ENABLE is set to NO in /etc/vsftpd
/vsftpd.conf.
Answer: C
Explanation:
The530 Permission deniederror indicates that the user is not allowed to log in. In vsFTPd, if theUSERLIST_ENABLEoption is set toYESin/etc/vsftpd/vsftpd.conf, and theoracleuser is listed in/etc/vsftpd
/user_list, that user is explicitly denied access to the FTP server.
NEW QUESTION # 35
Which two are true about using Ksplice?
- A. Ksplice can be used without a network connection
- B. The Ksplice client is freely available to all customers.
- C. Yum cannot upgrade a kernel patched by Ksplice
- D. It can patch the kernel without shutting down the system.
- E. Ksplice has two clients; each can run in three different modes.
Answer: A,D
Explanation:
Option A: Ksplice can be used without a network connection
* Explanation:
* Ksplice provides anOffline Clientspecifically designed for systems that do not have a direct connection to the internet. This client allows administrators to download Ksplice updates on a system with internet access and then transfer them to the offline system for installation.
* This means Ksplice can be effectively used in environments with strict security policies where network connectivity is restricted or not available.
* Oracle Linux Reference:
* OracleLinux 8: Ksplice User's Guide- Section on "Using the Ksplice Offline Client":
"The Ksplice Offline client enables you to apply Ksplice updates to systems that do not have direct access to the Internet or to the Oracle Uptrack server." Option B: It can patch the kernel without shutting down the system.
* Explanation:
* The primary purpose of Ksplice is to allow administrators to apply critical security patches to the running kernelwithout requiring a rebootor shutting down the system. This ensures high availability and minimizes downtime, which is crucial for production environments.
* Ksplice works by performingjust-in-time (JIT) compilationof kernel patches and applying them directly to the running kernel in memory.
* Oracle Linux Reference:
* OracleLinux 8: Ksplice User's Guide- Introduction:
"Ksplice enables you to keep your systems up to date and secure by applying important kernel security updates without rebooting." Why Other Options Are Not Correct:
* Option C:Yum cannot upgrade a kernel patched by Ksplice
* Explanation:
* This statement is false. While Ksplice patches the running kernel in memory, yum can still upgrade the kernel packages on disk. After a yum kernel update, a reboot would be necessary to run the new kernel version, but yum operations are not hindered by Ksplice patches.
* Oracle Linux Reference:
* OracleLinux 8: Ksplice User's Guide- Compatibility with Package Managers:
"Ksplice works seamlessly with package management tools like yum and dnf. You can continue to use these tools to manage your kernel packages."
* Option D:Ksplice has two clients; each can run in three different modes.
* Explanation:
* While Ksplice does have two clients (the online and offline clients), the statement about each running in three different modes is inaccurate or misleading. The clients do not operate in "three different modes" per se.
* Oracle Linux Reference:
* No official documentation supports the claim of "three different modes" for each client.
* Option E:The Ksplice client is freely available to all customers.
* Explanation:
* Ksplice is a feature available to customers with an active Oracle Linux Premier Support subscription. It is not freely available to all users.
* Oracle Linux Reference:
* OracleLinux 8: Ksplice User's Guide- Access Requirements:
"To use Ksplice, your system must be covered by an Oracle Linux Premier Support subscription." Conclusion:
Options A and B are correct because Ksplice can be used without a network connection via the offline client, and it allows patching the kernel without shutting down the system, ensuring minimal downtime.
NEW QUESTION # 36
Examine this command, which executes successfully:
# nmcli con add con-name eth2 type ethernet ifname eth2 \ Ipv6.address 2804:14c:110:ab2f:c3lb:1212:7917:708a/64 \ Ipv6.gateway 2804:14c:110:ab2f::1003 \ Ipv4.address 192.168.0.5/24 ipv4.gateway 192.168.0.254 The eth2 connection does not exist. Which two statements are true?
- A. The configuration is saved in /etc/sysconfig/network.
- B. It configures an automatic IPV6 address.
- C. A static IP address is assigned to the eth2 connection
- D. Ethernet connection eth2 is created.
Answer: C,D
NEW QUESTION # 37
Examine this command:
# nft add rule inet filter input tcp dport 80 drop
Which two statements are true upon execution?
- A. TCP packets inbound on port 80 are dropped.
- B. The rule updates the configuration on disk.
- C. TCP packets outbound on port 80 are dropped.
- D. The rule is applied to both IPv4 and IPv6 packets.
- E. All traffic inbound on port 80 is dropped.
- F. The rule applies to the input table.
Answer: A,D
NEW QUESTION # 38
Which two default user account settings are contained in /etc/login.defs?
- A. User hashed passwords.
- B. Group hashed passwords.
- C. Password aging controls.
- D. Decryption method used to decrypt passwords.
- E. Encryption method used to encrypt passwords.
Answer: C,E
NEW QUESTION # 39
Which two statements are true about systemd system and service manager?
- A. systemd is backward-compatible with the System V init scripts that were used in earlier versions of Oracle Linux.
- B. systemd reads /etc/system to determine which services to start.
- C. systemd service units expose kernel devices and can be used to implement device-based activation.
- D. systemd is the first process that starts after the system boots and is the final process left running before the system shuts down.
- E. The service command is used to start and stop system service units.
Answer: A,D
Explanation:
Explanation of Answer B:systemdis the first process to start (PID 1) after the Linux kernel has booted and is responsible for initializing the user space and managing system services throughout the system's runtime. It is also the last process to stop during shutdown.
Explanation of Answer C:systemdmaintains backward compatibility with older System V init scripts. It can run and manage these scripts, ensuring legacy services are supported while providing newer functionalities through nativesystemdunit files.
NEW QUESTION # 40
Which statement is true about slice units?
- A. A slice unit is a concept for hierarchically managing resources in a group of processes.
- B. A slice unit accepts multiple names by the creation of additional symlinks to the unit file.
- C. The system.slice contains all system services and user sessions.
- D. Processes in a slice unit are named at the same level as scopes and services.
Answer: A
NEW QUESTION # 41
Which two statements are true about the proc and sys file systems?
- A. sys contains a list of running processes.
- B. proc contains information about memory and CPUs.
- C. sys contains a list of mounted devices.
- D. sys contains information about memory and CPUs.
- E. proc contains a list of network drivers.
Answer: B,D
NEW QUESTION # 42
Which two statements are true about control groups (cgroups) in Oracle Linux 8?
- A. A cgroup is a collection of processes bound to a set of limits or parameters defined in the cgroups filesystem.
- B. Oracle Linux 8 implements cgroups v2 by default.
- C. The cgroups filesystem allows limits to be overwritten in the lower levels of the hierarchy.
- D. Different controllers from cgroups version 1 and cgroups version 2 cannot be used at the same time.
- E. Cgroups allow processes to be organized into hierarchical groups whose resource usage cannot be limited and monitored.
Answer: A,B
Explanation:
Explanation of Answer A:Oracle Linux 8 uses cgroups version 2 (cgroups v2) by default. cgroups v2 is a unified hierarchy system that introduces improvements over version 1, including a simplified interface and better resource management capabilities.
Explanation of Answer B:A control group (cgroup) is a mechanism for grouping processes and setting limits or parameters on their resource usage, such as CPU, memory, or I/O. These limits and parameters are configured and managed through the cgroups filesystem.
NEW QUESTION # 43
Which two default user account settings are contained in /etc/login.defs?
- A. User hashed passwords.
- B. Group hashed passwords.
- C. Password aging controls.
- D. Decryption method used to decrypt passwords.
- E. Encryption method used to encrypt passwords.
Answer: C,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 # 44
You must add an additional swap device and you add this entry to /etc/fstab:
/.swapfile none swap defaults 0 0
Examine these commands and output:
# dd if=/dev/zero of=/.swapfile bs=1024 count=1048576
1048576+0 records in
1048576+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 4.32499 s, 248 MB/s
# swapon -a
swapon: /.swapfile: insecure permissions 0644, 0600 suggested.
swapon: /.swapfile: read swap header failed
Which two actions must you perform to add this swap device?
- A. Change defaults to user in the /etc/fstab entry.
- B. Execute swapon -L swapfile /.swapfile after adding a label.
- C. Use a physical disk partition type of 82 (Linux swap).
- D. Execute swapon -all.
- E. Assign a label to the .swapfile file by using the swaplabel command.
- F. Initialize the .swapfile file by using the mkswap command.
Answer: E,F
Explanation:
To use a file as swap space, it must first be initialized with themkswapcommand. Theddcommand creates an empty file, butmkswapformats this file to be used as swap space. This command writes the necessary swap header to the file, making it recognizable by the system as a valid swap area.
Explanation of Answer D:After initializing the swap file withmkswap, you can optionally assign a label to the swap file using theswaplabelcommand. This is not strictly required, but it can be useful for identifying swap files, especially if you are using multiple swap devices.
NEW QUESTION # 45
Which three statements are true about the journalctl command?
- A. journalctl -p 6 shows all info log level messages and above.
- B. journalctl -k shows kernel logs since the last boot.
- C. journalctl -p notice..warning shows all messages from notice to warning log level since the last boot.
- D. journalctl -bl -p err fails if journal persistence is not configured.
- E. journalctl -p err shows only error log level.
Answer: A,B,E
Explanation:
Option B: journalctl -p err shows only error log level.
* Explanation:
* The -p or --priority option in journalctl filters messages by their priority level.
* When specifying asingle priority level, journalctl shows messagesonlyat that level.
* The priority levels, as per syslog standards, are:
* 0: emerg
* 1: alert
* 2: crit
* 3: err
* 4: warning
* 5: notice
* 6: info
* 7: debug
* Therefore, journalctl -p err displays messages with priorityerr (3)only.
* Oracle Linux Reference:
* OracleLinux 8: Managing Log Files- Section onFiltering Output withjournalctl:
"Use the -p option to display messages from the journal that have a specific priority level."
* Example:
# journalctl -p err
Option D: journalctl -k shows kernel logs since the last boot.
* Explanation:
* The -k or --dmesg option filters messages from the kernel, equivalent to the output of the dmesg command.
* This option implies -b, which limits the output to messages from the current boot.
* Therefore, journalctl -k displays kernel messages since the last boot.
* Oracle Linux Reference:
* OracleLinux 8: Managing Log Files- Section onViewing Kernel Messages:
"Use the journalctl -k command to display kernel messages since the last system boot."
* Example:
# journalctl -k
Option E: journalctl -p 6 shows all info log level messages and above.
* Explanation:
* When specifying a single numeric priority, journalctl displays messages withthat priority level and higher priority levels(i.e., lower severity).
* Priority levels are ordered from 0 (highest severity) to 7 (lowest severity).
* Therefore, journalctl -p 6 shows messages with priorities:
* 0 (emerg)
* 1 (alert)
* 2 (crit)
* 3 (err)
* 4 (warning)
* 5 (notice)
* 6 (info)
* This includesinfo level messages (6)and all higher priority messages.
* Oracle Linux Reference:
* OracleLinux 8: Managing Log Files- Section onFiltering Output with journalctl:
"When you specify a single priority level, journalctl shows messages at that level and higher severity."
* Example:
# journalctl -p 6
Why Other Options Are Not Correct:
* Option A:journalctl -bl -p err fails if journal persistence is not configured.
* Explanation:
* The -b option displays messages from the current boot. This works even if journal persistence isnotconfigured because the logs from the current boot are stored in volatile memory (/run/log/journal).
* Therefore, the command doesnot failif journal persistence is not configured.
* Oracle Linux Reference:
* OracleLinux 8: Managing Log Files- Section onJournal Volatility:
"By default, the journal stores logs in volatile memory and does not persist logs across reboots unless persistent storage is configured."
* Option C:journalctl -p notice..warning shows all messages from notice to warning log level since the last boot.
* Explanation:
* The -p option allows specifying arangeof priorities. However, the correct order for the range should be from thehigher priority (lower number)to thelower priority (higher number).
* Also, the priorities should be specified in the correct sequence, and ranges are inclusive.
* Moreover, journalctl by default shows messages from all boots unless limited by the -b option.
* Therefore, without -b, it does not limit messages to "since the last boot," making the statement incorrect.
* Correct Command:
* To display messages fromwarning (4)tonotice (5), the command should be:
# journalctl -p warning..notice -b
* But even then, the priorities need to be specified correctly, and the command in Option C is incorrect.
Conclusion:
OptionsB,D, andEare correct because they accurately describe the behavior of the journalctl command in filtering and displaying log messages based on priority levels and sources.
NEW QUESTION # 46
......
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