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Oracle Linux 8 Advanced System Administration Sample Questions (Q25-Q30):

NEW QUESTION # 25
Which command produces human-readable timestamps in kernel ring buffer messages?

A. dmesg -T
B. dmesg -W
C. dmesg -t
D. dmesg -x

Answer: A

Explanation:
* Option C (Correct):Thedmesg -Tcommand converts the timestamps in the kernel ring buffer messages to a human-readable format. The defaultdmesgoutput shows the timestamps in a raw format (seconds since the kernel started), while the-Toption translates these timestamps into a human-readable date and time.
* Option A (Incorrect):The-toption is used to remove the timestamps entirely from the output.
* Option B (Incorrect):The-xoption provides extended information about the message (e.g., facility, level).
* Option D (Incorrect):The-Woption waits for new messages and does not convert timestamps to a human-readable format.
Oracle Linux Reference:Refer to:
* man dmesgfor more details ondmesgoptions.

NEW QUESTION # 26
Which two statements are true about the GRUB 2 bootloader?

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

Answer: A,D

Explanation:
GRUB 2 (GRand Unified Bootloader version 2) is a bootloader that is capable of loading a variety of free operating systems directly. It also supports chain-loading, which is the process of loading other bootloaders.
This feature allows it to boot proprietary operating systems, such as Windows, by passing control to their respective bootloaders. This flexibility makes GRUB 2 a popular choice for dual-boot or multi-boot configurations.
Explanation of Answer D:GRUB 2 has the capability to understand multiple file systems (like ext2/3/4, Btrfs, XFS, etc.) and kernel executable formats. This capability means GRUB 2 does not rely on the physical location of a kernel on the disk to load an operating system. Instead, it reads the file system to locate the kernel file. This feature adds flexibility and ease in managing boot entries and reduces the complexity involved in locating kernels manually.

NEW QUESTION # 27
Which two statements are true about removing a physical volume (PV) from a volume group (VG)?

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

Answer: A,E

Explanation:
To remove a physical volume (PV) from a volume group (VG), it must first be removed using thevgreducecommand. This operation ensures that the VG no longer contains any references to the PV being removed.
Explanation of Answer D:A physical volume can be removed if there are no active logical volumes (LVs) on the VG that require space from that PV. If the LV is inactive, the PV can be safely removed from the VG.

NEW QUESTION # 28
The ss command was invoked with options to:
limit output to all listening and non-listening TCP ports
display ports instead of the protocols that typically use those ports
display all available internal TCP information
display only connections whose source or destination port is 80
Which two results are produced by the command?

A. icmp6 UNCONN 0 0 *:58 *:*
B. UNCONN 0 0 [::1]:323 [::]:*
C. ESTAB 0 0 10.12.18.92:50384 169.254.169.254:80 cubic wscale:9,7 rto:201 rtt: 0.226/0.113 ato:40 mss:8948 pmtu:9000 rcvmss:1728 advmss:8948 cwnd:10 bytes_sent:142 bytes_acked:143 bytes_received:1728 segs_out:4 segs_in:3 data_segs_out:1 data_segs_in:1 send 3167433628bps lastsnd:11351 lastrcv: 11351 lastack:11351 pacing_rate 6334867256bps delivery_rate 504112672bps delivered:2 app_limited rcv_space:62720 rcv_ssthresh:56588 minrtt:0.142
D. LISTEN 0 511 *:80 *:* cubic cwnd:10
E. tcp CLOSE-WAIT 32 0 server.example.com:44732 12.21.0.15:https

Answer: C,D

NEW QUESTION # 29
Examine these commands, which execute successfully:
# firewall-cmd --zone=public --add-service=cockpit --permanent
# firewall-cmd --zone=public --add-port=1313/tcp --permanent
# firewall-cmd --reload
Which are true upon execution?

A. The Cockpit service is added only to the public zone.
B. The custom Cockpit service configuration file is updated in /usr/lib/firewalld/services.
C. Egress traffic is allowed for the Cockpit service only when using port 1313.
D. Port 1313 blocks all traffic for the public zone except for ingress traffic to the Cockpit service.
E. Runtime firewall configuration is not lost when the firewalld process is restarted or the system is rebooted.

Answer: A,E

NEW QUESTION # 30
......

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