LPIC-1 Practice Test 15 — 15 Questions

Question 1

Which THREE of the following are types of expansion performed by the bash shell during command parsing?

Accepted Answer

Parameter expansion. Parameter expansion (A) is a genuine bash expansion type: the shell replaces constructs like $var, ${var}, or ${var:-default} with their values during command parsing. Tilde expansion (B) is also a real expansion: a leading ~ is replaced with the current user's home directory (or ~user with that user's home), as in ~/file becoming /home/user/file. Brace expansion (C) is likewise a bash expansion type: patterns such as {a,b,c} or {1..5} are expanded into multiple words before other expansions like parameter and command substitution. Variable assignment (D) is not an expansion but a shell operation that stores a value in a variable, and alias expansion (E) is not one of bash's documented expansion stages; aliases are substituted earlier during tokenization/alias lookup, not as a formal expansion type.

Answer

Variable assignment

Answer

Alias expansion

Question 2

A small office server running Ubuntu 20.04 experiences a gradual time drift. The system clock loses about 2 minutes per week. The hardware clock (RTC) is maintained by the motherboard battery and appears accurate when checked manually. The sysadmin wants to ensure the system clock stays synchronized automatically. Which single action should be taken? Options: A) Run 'timedatectl set-ntp true' to enable systemd-timesyncd, B) Add 'hwclock --hctosys' to /etc/rc.local, C) Install and configure the ntp package with a pool server, D) Use 'cron' to run ntpdate every minute.

Accepted Answer

Run 'timedatectl set-ntp true' to enable systemd-timesyncd. On Ubuntu 20.04, systemd-timesyncd is the default NTP client. Running 'timedatectl set-ntp true' (option A) activates it, which automatically synchronizes the system clock with NTP servers, correcting the gradual drift without needing additional packages or manual cron jobs. This is the simplest and most appropriate single action for automatic time sync on a modern systemd-based distribution.

Answer

Add 'hwclock --hctosys' to /etc/rc.local

Answer

Install and configure the ntp package with a pool server

Answer

Use 'cron' to run ntpdate every minute

Question 3

An administrator needs to monitor real-time network bandwidth usage on a Linux server. Which two tools are specifically designed for this purpose? (Choose two.)

Accepted Answer

nload. B (nload) is correct because it is a command-line tool that displays real-time network traffic and bandwidth usage on a per-interface basis, showing incoming and outgoing data rates with a dynamic graph. E (iftop) is correct because it listens to network traffic on a specified interface and displays a real-time table of bandwidth usage per connection, similar to top for processes. Both tools are specifically designed for monitoring live bandwidth consumption, unlike general networking utilities.

Answer

netstat

Answer

traceroute

Answer

ping

Question 4

Refer to the exhibit. The process with PID 1234 is in state 'Z'. What is the most likely cause and appropriate action?

Accepted Answer

The process is a zombie; the parent process must be killed or wait for it to be reaped.. In Linux process states, 'Z' indicates a zombie process, which is a child process that has terminated but whose exit status has not yet been read by its parent process via the wait() system call. The correct action is to either kill the parent process (so that the zombie is reaped by init) or ensure the parent calls wait() to reap the child. Option D correctly identifies this.

Answer

The process is stopped; use kill -CONT to continue.

Answer

The process is a daemon; it should be restarted.

Answer

The process is sleeping; wait for it to become ready.

Question 5

An administrator wants to prevent a specific user, 'john', from being able to schedule cron jobs. Which file should the administrator modify?

Accepted Answer

/etc/cron.deny. The /etc/cron.deny file lists users who are explicitly denied access to schedule cron jobs. If this file exists and the user 'john' is listed in it, he will be prevented from using crontab. This is the standard mechanism for restricting cron access when /etc/cron.allow does not exist.

Answer

/var/spool/cron/crontabs

Answer

/etc/cron.allow

Answer

/etc/crontab

Question 6

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. 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.. e4defrag is a userspace tool that provides online defragmentation for ext4 filesystems. It can check fragmentation levels and defragment files without unmounting the filesystem, thus avoiding downtime. This allows the administrator 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.

Question 7

A medium-sized company runs a web application on a Linux server. The server uses systemd and has the following configuration: the web application service (webapp.service) is configured to start after network.target and requires a database service (database.service) to be running. The database service has a Restart=on-failure directive. Recently, the server experienced a power outage. Upon reboot, the system administrator notices that the web application fails to start because the database service is in a failed state. The administrator checks the status of database.service and sees 'inactive (dead)' with no recent attempts to restart. The journal shows that the database service failed to start because a required filesystem (mounted at /var/lib/database) was not mounted when the database service tried to start. The filesystem is listed in /etc/fstab with the nofail option. The administrator wants to ensure that in future reboots, the database service starts successfully and the web application comes up without manual intervention. Which of the following is the best course of action?

Accepted Answer

Modify the database.service unit file to add 'After=var-lib-database.mount' and 'Requires=var-lib-database.mount'. The database service failed due to a missing mount at /var/lib/database. By adding 'After=var-lib-database.mount' and 'Requires=var-lib-database.mount' to the database.service unit, systemd will ensure the mount unit is started before the database service and that the database service is stopped if the mount fails. This directly addresses the root cause—the filesystem not being ready—without altering the restart behavior or the fstab nofail option, which is appropriate for allowing the system to boot even if the mount fails.

Answer

Change the Restart directive in database.service to 'always'

Answer

Remove the nofail option from /etc/fstab for /var/lib/database

Answer

Modify the webapp.service unit file to add 'After=database.service' and 'Requires=database.service'

Question 8

Which TWO commands are used to manage Debian packages? (Choose two.)

Accepted Answer

apt-get. apt-get is the primary command-line tool for handling Debian packages, handling dependency resolution and retrieval from repositories. dpkg is the low-level tool that directly installs, removes, and queries .deb package files without automatic dependency management. Both are essential for Debian-based package management.

Answer

zypper

Answer

yum

Answer

rpm

Question 9

A system administrator wants to disable the graphical target and boot to the text mode multi-user.target permanently. Which command should they run?

Accepted Answer

systemctl set-default multi-user.target. `systemctl set-default multi-user.target` permanently changes the default systemd target to multi-user.target, ensuring the system boots into text mode (runlevel 3 equivalent) on every subsequent boot. This persists across reboots, unlike temporary switches.

Answer

systemctl enable multi-user.target

Answer

systemctl isolate multi-user.target

Answer

systemctl default multi-user.target

Question 10

Which TWO commands can be used to display the current firewall rules in a system using nftables? (Choose two.)

Accepted Answer

nft list ruleset. `nft list ruleset` is the primary command in nftables to display the entire ruleset, including all tables, chains, and rules, regardless of the address family. Option D is also correct because `nft list table inet filter` specifically displays the rules within the 'filter' table of the 'inet' family, which is a valid way to show a subset of the firewall rules. Both commands rely on the nftables framework, which is the modern replacement for iptables on Linux.

Answer

systemctl status nftables

Answer

iptables -L -n

Answer

firewall-cmd --list-all

Question 11

A system is running out of disk space on /var. The administrator finds that /var/log/syslog is 4GB. Which of the following is the best course of action to prevent future issues while keeping recent logs?

Accepted Answer

Configure logrotate to rotate and compress logs daily.. Logrotate is the standard Linux utility for managing log file growth. By configuring it to rotate and compress logs daily, the administrator can automatically archive old logs (e.g., /var/log/syslog.1.gz) and keep only recent entries in the active file, preventing disk space exhaustion without losing historical data.

Answer

Use 'truncate -s 0 /var/log/syslog' to empty the file.

Answer

Configure syslog to stop logging.

Answer

Delete /var/log/syslog and create an empty file.

Question 12

Match each Linux command to its primary function.

Accepted Answer

cp: Copy files or directories. The correct matches are: cp for copying files, grep for searching text, and chmod for changing permissions. Common confusions include mixing these commands due to similar syntax or overlapping contexts.

Answer

cp: Search text using patterns

Answer

grep: Change file permissions

Answer

chmod: List directory contents

Question 13

Match each Linux directory to its standard purpose.

Accepted Answer

/bin: Essential user command binaries. Correct matches: /bin holds essential binaries, /etc stores system configuration, /var contains variable data. Common confusions arise from swapping purposes: /bin is not for variable data, /etc is not for temporary files, and /var does not hold binaries.

Answer

/bin: Variable data such as logs and spool files

Answer

/etc: Temporary files cleared on reboot

Answer

/var: Essential user command binaries

Question 14

On a Debian-based system using ifupdown, which file should be edited to configure a static IP address for an interface?

Accepted Answer

/etc/network/interfaces. On Debian-based systems using the traditional ifupdown suite, the file `/etc/network/interfaces` is the central configuration file for defining network interfaces, including static IP addresses. This file is parsed by the `ifup` and `ifdown` commands to bring interfaces up or down with the specified settings, such as `address`, `netmask`, and `gateway`.

Answer

/etc/systemd/network/50-static.network

Answer

/etc/netplan/01-netcfg.yaml

Answer

/etc/sysconfig/network-scripts/ifcfg-eth0

Question 15

A system administrator notices that the system time is incorrect by several minutes. Which command should be used first to check the status of NTP synchronization?

Accepted Answer

timedatectl. The `timedatectl` command is the correct first step because it shows the current system time, time zone, and NTP synchronization status in a single output. It directly reports whether NTP is active and whether the clock is synchronized, making it the standard diagnostic tool on modern systemd-based Linux distributions.

Answer

ntpdate

Answer

date

Answer

hwclock