This LPIC-2 practice question tests your understanding of linux kernel and system startup. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which file is used by GRUB2 to load the kernel and initramfs?
/etc/lilo.conf
Why wrong: This is the configuration file for LILO, not GRUB2.
/etc/default/grub
Why wrong: /etc/default/grub contains user-settable options, but the actual boot menu is generated from that file into grub.cfg.
/boot/grub/menu.lst
Why wrong: menu.lst is used by GRUB Legacy, not GRUB2.
/boot/grub/grub.cfg
GRUB2 uses grub.cfg as its main configuration file.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
/boot/grub/grub.cfg
GRUB2 uses /boot/grub/grub.cfg as its main configuration file, which contains the menu entries, kernel paths, and initramfs locations. This file is generated by update-grub (or grub-mkconfig) based on scripts in /etc/grub.d/ and settings in /etc/default/grub, and it is read directly by the GRUB2 bootloader at boot time to load the kernel and initramfs.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
/etc/lilo.conf
Why it's wrong here
This is the configuration file for LILO, not GRUB2.
/etc/default/grub
Why it's wrong here
/etc/default/grub contains user-settable options, but the actual boot menu is generated from that file into grub.cfg.
/boot/grub/menu.lst
Why it's wrong here
menu.lst is used by GRUB Legacy, not GRUB2.
/boot/grub/grub.cfg
Why this is correct
GRUB2 uses grub.cfg as its main configuration file.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse /etc/default/grub (the user configuration file) with the actual bootloader configuration file /boot/grub/grub.cfg, or they mistakenly associate GRUB2 with the legacy menu.lst file used by GRUB Legacy.
Detailed technical explanation
Under the hood, GRUB2's grub.cfg is a script-like file that supports functions, variables, and conditional logic, allowing dynamic boot configurations such as loading different kernels based on user input or recovery modes. A subtle behavior is that manual edits to grub.cfg are overwritten by update-grub, so persistent changes must be made via /etc/default/grub or custom scripts in /etc/grub.d/. In real-world scenarios, misconfiguring grub.cfg can lead to boot failures, requiring recovery via a live CD or GRUB rescue shell.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Linux Kernel and System Startup — This question tests Linux Kernel and System Startup — Read the scenario before looking for a memorised answer..
The correct answer is: /boot/grub/grub.cfg — GRUB2 uses /boot/grub/grub.cfg as its main configuration file, which contains the menu entries, kernel paths, and initramfs locations. This file is generated by update-grub (or grub-mkconfig) based on scripts in /etc/grub.d/ and settings in /etc/default/grub, and it is read directly by the GRUB2 bootloader at boot time to load the kernel and initramfs.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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