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Oracle Linux 8 Advanced System Administration Sample Questions (Q54-Q59):

NEW QUESTION # 54
Which two statements are true about systemd system and service manager?

A. The service command is used to start and stop system service units.
B. systemd is the first process that starts after the system boots and is the final process left running before the system shuts down.
C. systemd service units expose kernel devices and can be used to implement device-based activation.
D. systemd reads /etc/system to determine which services to start.
E. systemd is backward-compatible with the System V init scripts that were used in earlier versions of Oracle Linux.

Answer: B,E

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 # 55
Examine this command:
# auditctl -w /etc/passwd -p w -k pass
Which two statements are true upon execution?

A. A write occurs to /etc/audit/audit.rules.
B. An audit is defined that creates a log entry every time a write occurs to /etc/passwd.
C. A write occurs to /etc/audit/rules.d/audit.rules.
D. An audit rule is defined with the keyword pass.
E. An audit rule is defined that creates a log entry every time /etc/passwd is read.

Answer: B,D

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 # 56
Which two statements are true about the proc and sys file systems?

A. sys contains a list of mounted devices.
B. proc contains information about memory and CPUs.
C. proc contains a list of network drivers.
D. sys contains a list of running processes.
E. sys contains information about memory and CPUs.

Answer: B,E

Explanation:
* Option A (Correct):The/procfile system is a pseudo-file system that contains runtime system information (e.g., system memory, mounted devices, hardware configuration, etc.). Files such as/proc
/meminfoand/proc/cpuinfoprovide detailed information about memory and CPUs, respectively.
* Option C (Correct):The/sysfile system, also known as sysfs, provides a view of the kernel's device model. It contains information about system hardware, including CPUs and memory. For example,/sys
/devices/system/cpu/contains directories and files that provide detailed information about each CPU.
* Option B (Incorrect):The/sysfile system does not contain a list of running processes. Running processes are listed in the/procfile system, with each process having its own directory under/proc.
* Option D (Incorrect):/procdoes not contain a list of network drivers specifically. Network driver information is available under/proc/net, but this does not equate to a list of drivers.
* Option E (Incorrect):The/sysfile system does not contain a list of mounted devices. Mounted devices are listed in/proc/mountsor the/etc/mtabfile.
Oracle Linux Reference:For more details, see:
* OracleLinux 8: The/procand/sysFile Systems.

NEW QUESTION # 57
Examine these requirements for a host with a user oracle:
* Network services must run in a confined domain.
* The oracle user must be confined.
* The oracle user must be able to use Mozilla Firefox.
* Access to files and directories must be granted based only on SELinux contexts.
* The SELinux configuration must be persistent across system restarts.
* Users must be able to publish private HTML content.
Now examine these commands and output:
# sestatus
SELinux status: enabled
SELinuxfs mount: /sys/fs/selinux
SELinux root directory: /etc/selinux
Loaded policy name: targeted
Current mode: permissive
Mode from config file: permissive
Policy MLS status: enabled
Policy deny_unknown status: allowed
Memory protection checking: actual (secure)
Max Kernel policy version: 31
# setenforce enforcing
# semanage login -a -s guest_u oracle
# setsebool -P http_enable_homedirs on
Which requirements are satisfied?

A. 1, 2, 4, 5, 6
B. 1, 2, 3, 5, 6
C. 1, 2, 6
D. 1, 2, 3, 6
E. 1, 2, 3, 4, 5, 6
F. 1, 2, 4, 6

Answer: A

Explanation:
Explanation of Answer A:
* Network services running in a confined domain: SELinux provides domain confinement for services, ensuring they run with restricted access based on their defined policies.
* The oracle user must be confined: The commandsemanage login -a -s guest_u oracleconfines theoracleuser to theguest_uSELinux user role, which is a confined role.
* Access to files and directories based only on SELinux contexts: With SELinux enabled and the policy loaded, access is governed by SELinux contexts.
* Persistent SELinux configuration across reboots: Thesetenforce enforcingcommand, combined with the appropriate policy configuration, ensures that SELinux remains in enforcing mode across reboots.
* Users able to publish private HTML content: Thesetsebool -P http_enable_homedirs oncommand enables the use of user home directories for web content, allowing users to host personal web pages.

NEW QUESTION # 58
Which two statements are true about the GRUB 2 bootloader?

A. Its configuration can be changed by editing /etc/default/grub2 and executing grub2-mkconfig to regenerate grub2.cfg.
B. Its configuration file is /boot/grub2/grub2.conf on BIOS-based systems.
C. It understands file systems and kernel executable formats, allowing the loading of operating systems without recording the on-disk physical location of the kernel.
D. It can load many free operating systems directly and chain-load proprietary operating systems.

Answer: C,D

NEW QUESTION # 59
......

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