LPIC-1 Practice Test 3 — 10 Questions

Question 1

After creating a new user with 'useradd john', the user 'john' cannot log in. What is the most likely cause?

Accepted Answer

No password has been set for the user. The `useradd` command creates a new user account but does not set a password. Without a password, the system's authentication mechanism (typically PAM) will deny login attempts, as there is no valid password hash in `/etc/shadow`. The user must have a password assigned via `passwd john` before they can authenticate.

Answer

The home directory does not exist

Answer

The user's shell is not set

Answer

The user is not in the sudoers file

Question 2

Refer to the exhibit. A system administrator finds this line in /etc/rsyslog.conf. What is the effect of this configuration?

Accepted Answer

All syslog messages are forwarded via UDP to the server at 192.168.1.100 on port 514.. The line `*.* @192.168.1.100:514` in rsyslog.conf uses the `@` symbol to indicate UDP forwarding. The `*.*` selector means all facilities and all priorities, so every syslog message is forwarded via UDP to the server at 192.168.1.100 on port 514. This is a standard rsyslog syntax for remote logging.

Answer

Only messages with facility *.info are forwarded.

Answer

All syslog messages are forwarded via TCP to the server.

Answer

Only authentication-related messages are forwarded.

Question 3

On a Fedora system, which command is used to update all installed packages to their latest versions?

Accepted Answer

`dnf upgrade`. On Fedora, `dnf upgrade` is the correct command to update all installed packages to their latest versions. It synchronizes the local package database with the repositories and upgrades every installed package that has a newer version available, handling dependencies automatically.

Answer

`dnf check-update`

Answer

`dnf update all`

Answer

`dnf install update`

Question 4

Which THREE of the following are valid symbolic mode expressions for the chmod command?

Accepted Answer

u+x. Option A (u+x) is a valid symbolic mode because it specifies the user class 'u' and adds (+) the execute permission, which is standard chmod symbolic syntax. Option C (a+rwx) is valid because 'a' represents all three permission classes (user, group, and other) and +rwx grants read, write, and execute to each. Option E (g-w) is valid because it targets the group class 'g' and removes (-) the write permission. Option B (755) is not a symbolic mode but an octal (numeric) mode, which uses digits rather than letters and operators. Option D (c+r) is invalid because 'c' is not a recognized permission class in chmod; the valid classes are u, g, o, and a.

Answer

755

Answer

c+r

Question 5

A shell script uses the variable expansion ${var:-default} to set a default value for an environment variable. The script prints unexpected output when the variable is set to an empty string. Which expansion should be used to ensure the default is only used when the variable is unset, not when it is empty?

Accepted Answer

${var-default}. The expansion `${var-default}` uses the default value only when the variable is unset (i.e., does not exist at all). In contrast, `${var:-default}` also substitutes the default when the variable is set but empty, which causes the unexpected output described in the question. The colon in the expansion is the critical difference: it adds the check for a null or empty string.

Answer

${var:-default}

Answer

${var:?default}

Answer

${var:=default}

Question 6

A DHCP server assigns IP addresses to clients, but some clients are not receiving the correct gateway. Which configuration file should be checked on the DHCP server?

Accepted Answer

/etc/dhcp/dhcpd.conf. The DHCP server configuration file on Linux systems is typically located at /etc/dhcp/dhcpd.conf (or /etc/dhcpd.conf on some older distributions). This file contains the subnet declarations, option definitions (such as option routers for the default gateway), and other parameters that the DHCP server uses to assign IP addresses and configuration details to clients. If clients are not receiving the correct gateway, the 'option routers' directive within this file should be checked and corrected.

Answer

/etc/dhcpd.conf

Answer

/etc/dhcp/dhclient.conf

Answer

/etc/resolv.conf

Question 7

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.. 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 8

An administrator needs to replace all occurrences of 'old_host' with 'new_host' in the file /etc/hosts. Which sed command should be used?

Accepted Answer

sed -i 's/old_host/new_host/g' /etc/hosts. The `-i` flag enables in-place editing of the file, and the `g` flag (global) ensures all occurrences on each line are replaced, not just the first. The command `sed -i 's/old_host/new_host/g' /etc/hosts` modifies the file directly, replacing every instance of 'old_host' with 'new_host' throughout the file.

Answer

sed -n 's/old_host/new_host/gp' /etc/hosts

Answer

sed -i 's/old_host/new_host/' /etc/hosts

Answer

sed 's/old_host/new_host/g' /etc/hosts

Question 9

A company is setting up a database server that requires high reliability and support for snapshots. The storage will be on a single large disk. Which filesystem is best suited for this requirement?

Accepted Answer

btrfs. Btrfs (B-tree filesystem) is best suited for this requirement because it natively supports snapshots, checksumming, and copy-on-write (CoW) for high reliability, all on a single disk. Unlike other Linux filesystems, btrfs provides built-in snapshot and rollback capabilities without requiring an external volume manager, making it ideal for database servers needing consistent point-in-time backups.

Answer

ext4

Answer

NTFS

Answer

XFS

Question 10

Which three options are valid ways to install a package 'curl' on a RHEL 8 system? (Choose three.)

Accepted Answer

`dnf install curl`. `dnf` is the default package manager on RHEL 8, replacing `yum` for handling RPM packages with automatic dependency resolution. It directly installs the `curl` package from configured repositories.

Answer

`apt-get install curl`

Answer

`zypper install curl`