LPIC-1 System Architecture — Timed 15 Questions

Question 1

A system administrator notices that the server's clock is consistently off by several minutes. Which service should be used to synchronize the time with an external time source?

Accepted Answer

ntpd. The Network Time Protocol (NTP) daemon (ntpd) is the traditional and widely used service for synchronizing a server's clock with an external time source. It continuously adjusts the system time by communicating with NTP servers, compensating for clock drift and network delays to maintain accurate time. This makes ntpd the correct choice for resolving a consistent clock offset of several minutes.

Answer

timed

Answer

chronyd

Answer

systemd-timesyncd

Question 2

During boot, the kernel must mount the root filesystem. Which of the following is responsible for providing the kernel with the location of the root filesystem?

Accepted Answer

boot loader. The boot loader (e.g., GRUB) is responsible for loading the kernel into memory and passing it the location of the root filesystem via kernel command-line parameters such as `root=`. Without this parameter, the kernel would not know which block device or partition to mount as `/`. The boot loader reads configuration files (e.g., `grub.cfg`) that specify this parameter, making it the direct provider of the root filesystem location.

Answer

udev

Answer

initramfs

Answer

init

Question 3

A server has two disk drives: /dev/sda (SSD) and /dev/sdb (HDD). The administrator wants to place frequently accessed files on the SSD for performance. Which approach best achieves this using Linux filesystem features?

Accepted Answer

Create separate LVM logical volumes on each disk and mount them at different mount points.. Option A is correct because LVM allows the administrator to create separate logical volumes on each physical disk (/dev/sda and /dev/sdb) and mount them at distinct mount points. By placing frequently accessed files on the SSD logical volume and less critical data on the HDD logical volume, the administrator can directly control which files benefit from the SSD's faster performance without mixing data or requiring complex overlays.

Answer

Configure RAID 0 across both disks to combine speed.

Answer

Use symbolic links to redirect file access to the SSD.

Answer

Use a union mount to overlay the SSD on top of the HDD.

Question 4

A technician is troubleshooting a system that fails to boot with the error 'Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)'. What is the most likely cause?

Accepted Answer

The kernel lacks the necessary driver for the storage controller.. The error 'VFS: Unable to mount root fs on unknown-block(0,0)' indicates that the kernel cannot locate or access the root filesystem. This typically occurs because the kernel lacks the necessary driver (module) for the storage controller (e.g., SATA, SCSI, NVMe) that the root device is connected to, so it cannot read the partition table or mount the root filesystem.

Answer

The init binary is missing or corrupted.

Answer

The root filesystem is corrupted and needs fsck.

Answer

The boot loader is not installed correctly.

Question 5

Which hardware component uses a unique address to identify itself on the network at the data link layer?

Accepted Answer

MAC address. The MAC address (Media Access Control) is a unique 48-bit identifier burned into the network interface controller (NIC) by the manufacturer. It operates at Layer 2 (data link layer) of the OSI model, enabling devices on the same local network segment to communicate directly using protocols like Ethernet or Wi-Fi.

Answer

IP address

Answer

Hostname

Answer

Port number

Question 6

A Linux system has two network interfaces: eth0 and eth1. The administrator wants to bond them for increased throughput. Which kernel module is required for bonding?

Accepted Answer

bonding. The bonding driver in Linux allows multiple network interfaces to be aggregated into a single logical interface for increased throughput or redundancy. The correct kernel module is named 'bonding' (loaded via modprobe bonding or compiled into the kernel), which implements the IEEE 802.3ad Link Aggregation standard and other bonding modes. Option B is correct because 'bonding' is the exact module name used in the Linux kernel.

Answer

aggregation

Answer

team

Answer

bond

Question 7

An administrator needs to ensure that a specific kernel module is loaded automatically at boot. Which file should be used to permanently load the module?

Accepted Answer

/etc/modules. Option C is correct because on modern Linux systems using a standard init system, the file /etc/modules (or /etc/modules-load.d/*.conf on systemd-based distributions) is read at boot to load specified kernel modules automatically. This file lists module names one per line, and the kernel's module loading mechanism processes it early in the boot sequence to ensure the module is available before services that depend on it start.

Answer

/etc/modprobe.d/modules.conf

Answer

/etc/sysconfig/modules

Answer

/etc/conf.modules

Question 8

Which command displays information about the CPU, including model name, cache size, and flags?

Accepted Answer

lscpu. The `lscpu` command is the correct choice because it is specifically designed to display CPU architecture information, including model name, cache sizes, and flags (such as SSE, AES, etc.), by reading data from sysfs and /proc/cpuinfo in a human-readable format. It provides a concise summary without requiring root privileges, making it the most appropriate tool for this task.

Answer

uname -a

Answer

cat /proc/cpuinfo

Answer

dmidecode

Question 9

A server with a udev rule fails to consistently assign a persistent network interface name. What is the most likely cause?

Accepted Answer

The network interface's MAC address is not unique or changes.. Persistent network interface names in Linux rely on udev rules that match attributes like MAC address. If the MAC address is not unique (e.g., due to a virtual machine or cloned NIC) or changes (e.g., after hardware replacement or driver update), the rule will fail to consistently identify the interface, causing the name assignment to be unpredictable.

Answer

The rule uses an incorrect operator.

Answer

The BIOS device name is configured incorrectly.

Answer

The kernel module for the NIC is not loaded.

Question 10

Which TWO of the following are valid methods to reduce boot time on a Linux system? (Select exactly 2.)

Accepted Answer

Disable unnecessary systemd services.. Disabling unnecessary systemd services reduces the number of processes that must be started during boot, directly decreasing the time spent in the target phase of systemd's parallel service activation. Each disabled service eliminates its own dependency resolution, unit loading, and execution overhead, which is especially impactful on systems with many enabled services.

Answer

Use an initramfs with minimal drivers.

Answer

Increase the kernel log level to debug.

Answer

Use ext2 instead of ext4 as the root filesystem.

Question 11

Which THREE of the following are characteristics of UEFI firmware compared to legacy BIOS? (Select exactly 3.)

Accepted Answer

Supports booting from disks larger than 2 TB.. UEFI firmware uses the GUID Partition Table (GPT) instead of MBR, which supports 64-bit logical block addressing (LBA). This allows addressing disks larger than 2 TB, as the MBR scheme is limited to 32-bit LBA and a maximum addressable size of approximately 2.2 TB. Therefore, option A is correct.

Answer

Uses the Master Boot Record partition table.

Answer

Requires a boot loader stored in the Master Boot Record.

Question 12

Which TWO commands can be used to display the amount of free and used memory on a Linux system? (Select exactly 2.)

Accepted Answer

cat /proc/meminfo. Option C is correct because `/proc/meminfo` is a virtual file maintained by the kernel that provides detailed, real-time memory statistics, including total, free, available, and used memory. Reading this file with `cat` directly displays the current memory usage without any additional processing.

Answer

vmstat

Answer

du

Answer

top

Question 13

Refer to the exhibit. The system has a single disk with three partitions. Which partition contains the root filesystem?

Accepted Answer

sda3. The root filesystem is mounted from the partition that contains the / (root) directory. In Linux, partitions are numbered starting from 1 (e.g., sda1, sda2, sda3). The device sda itself refers to the entire disk, not a partition. Since the system has three partitions and the correct answer is sda3, partition sda3 must be the one designated as the root filesystem, typically identified by the mount point '/' in /etc/fstab or by the kernel boot parameter root=.

Answer

sda

Answer

sda1

Answer

sda2

Question 14

Refer to the exhibit. How many SATA controllers are detected, and what is the connection speed of the SSD?

Accepted Answer

2 controllers; SSD at 6.0 Gbps. The output from `lspci` shows two SATA controllers: one identified as 'SATA controller: Intel Corporation 82801IBM/IEM (ICH9M/ICH9M-E) 4 port SATA Controller' and another as 'SATA controller: Intel Corporation 82801IBM/IEM (ICH9M/ICH9M-E) 2 port SATA Controller'. The SSD is connected to the 6 Gbps port, as indicated by the '6 Gbps' label in the device listing, confirming a 6.0 Gbps connection speed.

Answer

3 controllers; SSD at 6.0 Gbps

Answer

2 controllers; SSD at 3.0 Gbps

Answer

1 controller; SSD at 6.0 Gbps

Question 15

A company runs a critical database server on Linux. The server has a hardware RAID controller with two logical volumes: one for the operating system (LV1) and one for the database data (LV2). The server uses LVM on top of the RAID volumes. Recently, the database performance has degraded. The administrator suspects that the file system on LV2 is heavily fragmented. The server uses the ext4 filesystem. The administrator wants to check the fragmentation level and, if necessary, defragment the filesystem without unmounting it or causing downtime. However, ext4 does not support online defragmentation. What should the administrator do to minimize fragmentation impact while maintaining availability?

Accepted Answer

Use the e4defrag command with the -v option on the mount point to check and defragment files online.. Option D is correct because e4defrag is a tool specifically designed for online defragmentation of ext4 filesystems. It can check fragmentation levels and defragment files without requiring the filesystem to be unmounted, thus avoiding downtime. This directly addresses the administrator's need to minimize fragmentation impact while maintaining availability.

Answer

Create a new filesystem on LV2, copy data back, and symlink the old mount point to the new one.

Answer

Use tune2fs to set the reserved block percentage to 0 and increase the inode size.

Answer

Schedule a maintenance window, unmount LV2, run e2fsck -fn, then run e2fsck -D to defragment.