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Oracle Linux 8 Advanced System Administration Sample Questions (Q61-Q66):

NEW QUESTION # 61
Which two statements are true about removing a physical volume (PV) from a volume group (VG)?

A. It can be removed when an active VG has mounted file systems by running vgexport.
B. It can be removed when an inactive logical volume is on the VG.
C. It can be removed when it is part of an active VG.
D. It can be removed only after removing it from its VG by using vgreduce.
E. It cannot be removed when it is part of an active VG.

Answer: D,E

NEW QUESTION # 62
Which two statements are true about the Linux Auditing System?

A. Auditing rules can log administrator attempts to access user home directories.
B. Auditing system call rules can affect system performance depending on the amount of information that is logged.
C. Auditing can scan for Common Vulnerabilities and Exposures (CVE) and automatically apply needed patches to a system.
D. Auditing includes security policies, each of which includes security rules, or checks, which are checked when you run a security scan.
E. Auditing modes include permissive, enforcing, and disabled.

Answer: A,B

NEW QUESTION # 63
Examine these commands executed by root:
# mkdir -p /jail /jail/bin /jail/lib64
# cp $(which bash) /jail/bin/
# ldd $(which bash)
linux-vdso.so.1 (0x00007ffd574f5000)
libtinfo.so.6 => /lib64/libtinfo.so.6 (0x00007fb458c2c000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007fb458a28000)
libc.so.6 => /lib64/libc.so.6 (0x00007fb458666000)
/lib64/ld-linux-x86-64.so.2 (0x00007fb459177000)
# cp /lib64/libtinfo.so.6 /jail/lib64/
# cp /lib64/libdl.so.2 /jail/lib64/
# cp /lib64/libc.so.6 /jail/lib64/
# cp /lib64/ld-linux-x86-64.so.2 /jail/lib64/
# chroot /jail
What is the output from the cd, pwd, and ls commands?

A. bash-4.4# cd
bash: cd: command not found
bash-4.4# pwd
bash: pwd: command not found
bash-4.4# ls
bash: ls: command not found
B. bash-4.4# cd
bash: cd: /root: No such file or directory
bash-4.4# pwd
/root
bash-4.4# ls
bash: ls: command not found
C. bash-4.4# cd
bash: cd: /root: No such file or directory
bash-4.4# pwd
/
bash-4.4# ls
bin lib64
D. bash-4.4# cd
bash: cd: /root: Unable to access chrooted file or directory /root
bash-4.4# pwd
/
bash-4.4# ls
bin lib64

Answer: C

NEW QUESTION # 64
Examine this command:
# nft add rule inet filter input tcp dport 80 drop
Which two statements are true upon execution?

A. The rule is applied to both IPv4 and IPv6 packets.
B. The rule applies to the input table.
C. TCP packets outbound on port 80 are dropped.
D. All traffic inbound on port 80 is dropped.
E. The rule updates the configuration on disk.
F. TCP packets inbound on port 80 are dropped.

Answer: A,F

NEW QUESTION # 65
Which three statements are true about the journalctl command?

A. journalctl -k shows kernel logs since the last boot.
B. journalctl -p err shows only error log level.
C. journalctl -p 6 shows all info log level messages and above.
D. journalctl -p notice..warning shows all messages from notice to warning log level since the last boot.
E. journalctl -bl -p err fails if journal persistence is not configured.

Answer: A,B,C

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 # 66
......

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