LPIC-1 Practice Test 27 — 15 Questions

Question 1

A junior administrator needs to extract only the lines containing the word 'ERROR' from /var/log/syslog, but the log may have inconsistent casing (e.g., 'ERROR', 'Error', 'error'). Which command will print all such lines while ignoring case?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

grep -i 'ERROR' /var/log/syslog. To extract lines with any casing of 'ERROR', the case-insensitive option -i must be used with grep. This allows matching 'ERROR', 'Error', 'error', etc., in a single command. The other grep invocations either do not ignore case, invert the match, or count lines instead of displaying them, so they fail to meet the scenario's need.

Answer

grep -v 'ERROR' /var/log/syslog

Answer

grep 'ERROR' /var/log/syslog

Answer

grep -c 'ERROR' /var/log/syslog

Question 2

A shell script contains the following line: `find /data -type f -name '*.tmp' -exec rm {} \;`. What is the effect of this command?

Accepted Answer

It removes all files ending with .tmp in /data and its subdirectories.. The find command with -type f -name '*.tmp' -exec rm {} \; locates all regular files with names ending in .tmp under /data and executes rm on each. This deletes those files. The backslash escapes the semicolon to prevent shell interpretation. This is a common idiom for batch deletion. Other options misinterpret the type, name pattern, or action.

Answer

It removes all empty directories ending with .tmp in /data.

Answer

It lists all .tmp files in /data without deleting them.

Answer

It removes all files in /data that do not end with .tmp.

Question 3

A Linux administrator needs to configure a system to act as a router between two subnets. The system has two network interfaces: eth0 (192.168.1.1/24) and eth1 (10.0.0.1/24). Which TWO steps are required to enable routing between these subnets? (Choose two.)

Accepted Answer

Configure firewall rules to allow forwarding between the interfaces.. To enable a Linux system to route traffic between two directly connected subnets, IP forwarding must be enabled in the kernel, and firewall rules must permit forwarding between the interfaces. Static routes are not needed because the networks are directly connected. NAT is not required for internal routing, and configuring client gateways is done on the clients, not the router.

Answer

Add static routes for each subnet on both interfaces.

Answer

Set the default gateway on both subnets to point to the router's interface IP.

Answer

Enable NAT (masquerading) on the external interface.

Question 4

A Linux administrator needs to configure a new system to automatically mount an NFS share at boot. The share is exported from server 'nfs.example.com' as '/export/data'. The mount point '/mnt/data' already exists. Which TWO actions are required to ensure the share is mounted automatically and persistently? (Choose two.)

Accepted Answer

Install the NFS client utilities (e.g., nfs-common or nfs-utils).. To automatically mount an NFS share at boot, you must add an entry to /etc/fstab and ensure the NFS client utilities are installed. The fstab entry defines the mount, and the utilities provide the necessary mount.nfs helper. Other actions like running mount -a are for immediate mounting, modifying /etc/exports is for servers, and running the nfs service is not required on the client.

Answer

Run 'mount -a' to mount all entries in /etc/fstab.

Answer

Ensure the 'nfs' service is running on the client.

Answer

Add the NFS share to /etc/exports.

Question 5

A Linux administrator is preparing a new Ubuntu 22.04 server and needs to ensure that the package lists are up to date before installing software. Which command should be used to refresh the package index from all configured repositories?

Accepted Answer

apt update. The apt update command synchronizes the local package index with the repositories, ensuring that subsequent install or upgrade commands operate on the latest metadata. It is a prerequisite for installing new software or applying updates. The other commands either perform upgrades based on stale data or are invalid. Refreshing the index is a routine maintenance task on Debian-based systems.

Answer

apt-get install --refresh

Answer

apt upgrade

Answer

apt dist-upgrade

Question 6

A Linux server acts as a router between an internal network and the internet. After enabling IPv4 forwarding, clients still cannot reach external hosts. The administrator confirms the routing table is correct and the external interface is up. Which command displays the current kernel packet-filter rules so the administrator can verify whether forwarding is being blocked?

Accepted Answer

nft list ruleset. Forwarded packets traverse the forward path of the packet filter, so a drop or reject rule there prevents transit traffic even when routing and interface state are correct. On a host using the nftables backend, nft list ruleset dumps the entire ruleset, exposing any forward chain rules that block the traffic and allowing the administrator to confirm the cause.

Answer

ip route show

Answer

ss -tulpn

Answer

ip -s link show

Question 7

A Linux administrator is configuring a CentOS 7 server and needs to manage software packages using the native RPM toolset. The administrator wants to perform two tasks: (1) verify the integrity of an installed package against its original metadata, and (2) list all files installed by a specific package. Which TWO commands should the administrator use? (Choose two.)

Accepted Answer

rpm -ql package_name. The correct commands are rpm -V for verifying package integrity and rpm -ql for listing installed files. These directly address the two tasks: verification checks file attributes against the RPM database, and query list enumerates all files from a package. The other options provide different types of package information and do not fulfill the requirements.

Answer

rpm -q --changelog package_name

Answer

rpm -qi package_name

Answer

rpm -qf /path/to/file

Question 8

A Linux administrator is preparing a new server and needs to install a package group called 'Development Tools' on a CentOS 8 system. The administrator wants to see which packages are included in this group before installing. Which command should be used?

Accepted Answer

dnf group info "Development Tools". dnf group info provides a detailed breakdown of a package group, listing the packages that are part of it. This allows the administrator to review the contents before deciding to install. It is the standard way to inspect groups on CentOS 8 and other dnf-based distributions.

Answer

yum groupinstall "Development Tools"

Answer

dnf list groups

Answer

rpm -q --group "Development Tools"

Question 9

An administrator wants to add a kernel parameter 'quiet splash' to the default boot entry. Which file should be edited?

Accepted Answer

/etc/default/grub. The correct file to edit is /etc/default/grub because it is the main configuration file for GRUB 2 where kernel boot parameters like 'quiet splash' are defined in the GRUB_CMDLINE_LINUX_DEFAULT variable. After editing this file, the administrator must run update-grub (or grub-mkconfig) to regenerate the actual boot configuration file /boot/grub/grub.cfg.

Answer

/etc/grub.d/00_header

Answer

/etc/grub.conf

Answer

/boot/grub/grub.cfg

Question 10

A Linux administrator needs to configure a system to use a proxy server for HTTP and HTTPS traffic for all users. Which TWO environment variables should be set in a system-wide profile script to ensure that command-line tools like curl and wget use the proxy? (Choose two.)

Accepted Answer

http_proxy. Setting http_proxy and https_proxy in a system-wide profile script ensures that command-line tools like curl and wget route HTTP and HTTPS traffic through the proxy. These variables are widely recognized and provide comprehensive coverage for web traffic.

Answer

no_proxy

Answer

all_proxy

Answer

ftp_proxy

Question 11

A shell script contains a function named `cleanup` that must run automatically when the script exits, whether it finishes normally or is terminated by a signal. Which construct should be used to register this function?

Accepted Answer

trap cleanup EXIT. The `trap ... EXIT` form registers a handler for the shell's exit event, which fires on normal termination as well as on exits caused by signals the shell processes. That covers both cases in the scenario, whereas trapping only specific signals would miss normal completion and merely calling the function would not defer it.

Answer

cleanup && exit

Answer

trap cleanup INT TERM

Answer

at_exit cleanup

Question 12

A backup script stores its log file path in the variable LOGFILE and needs to append a timestamp line to that file. Which command correctly appends the output of the `date` command to the file named in the variable?

Accepted Answer

date >> $LOGFILE. Appending output requires the `>>` redirection operator, which opens the destination file for appending rather than truncating it. With the variable expanded to the log path, `date >> $LOGFILE` adds a new timestamp line while keeping all previous entries intact, which is exactly what the backup script needs.

Answer

date < $LOGFILE

Answer

date | $LOGFILE

Answer

date > $LOGFILE

Question 13

A junior administrator needs to schedule a backup script to run as the user 'backup' every day at 02:30. The script is /usr/local/bin/backup.sh, and output should be discarded. Which crontab entry should the administrator add to the 'backup' user's crontab to accomplish this?

Accepted Answer

30 2 * * * /usr/local/bin/backup.sh >/dev/null 2>&1. The correct entry uses the five time-and-date fields followed by the command. Placing it in the 'backup' user's crontab ensures it runs as that user. The redirection >/dev/null 2>&1 discards both stdout and stderr, meeting the requirement to suppress output. The other entries either misplace the time fields, omit stderr redirection, or incorrectly add a user field that is invalid in a user crontab.

Answer

2 30 * * * /usr/local/bin/backup.sh >/dev/null 2>&1

Answer

30 2 * * * /usr/local/bin/backup.sh >/dev/null

Answer

30 2 * * * backup /usr/local/bin/backup.sh >/dev/null 2>&1

Question 14

A Linux workstation appears to hang early in the boot process after the initramfs is loaded. The administrator wants to add kernel boot parameters temporarily from the GRUB 2 menu without making a permanent change. Which action should the administrator take?

Accepted Answer

At the GRUB menu, press e to edit the selected entry, append the parameters to the linux line, and press Ctrl+X or F10 to boot.. GRUB 2 allows one-time modification of a boot entry from the menu. Pressing e opens the entry for editing, where the kernel command line can be appended, then Ctrl+X or F10 boots with those in-memory changes. Nothing is written to configuration files, so the modification applies only to that boot, which is ideal for testing parameters during troubleshooting.

Answer

At the GRUB menu, press c to open the command line and run the normal command.

Answer

Boot normally, then use sysctl -w to apply the parameters and reboot.

Answer

Edit /etc/default/grub, add the parameters to GRUB_CMDLINE_LINUX, and reboot.

Question 15

A system administrator wants to change the default runlevel of a SysV init-based system to runlevel 3. Which file should be edited to make this change persistent across reboots?

Accepted Answer

/etc/inittab. For SysV init systems, the default runlevel is set in /etc/inittab via the initdefault line. Editing that file to specify runlevel 3 ensures the system boots to runlevel 3 on subsequent reboots. The other files are associated with different init systems or purposes and would not achieve the desired change.

Answer

/etc/init/rc-sysinit.conf

Answer

/etc/rc.d/rc.local

Answer

/etc/systemd/system/default.target