LPIC-1 Practice Test 4 — 10 Questions

Question 1

A system administrator notices that the system's syslog messages are not being written to /var/log/messages. The rsyslog service is running. The administrator wants to check the configuration syntax of rsyslog. Which command should be used?

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

Accepted Answer

rsyslogd -N. The correct command is `rsyslogd -N` because the `-N` option performs a configuration syntax check without starting or restarting the rsyslog daemon. This allows the administrator to validate the rsyslog configuration file for errors before applying changes, ensuring that syslog messages will be written correctly to /var/log/messages.

Answer

rsyslogd -d

Answer

rsyslogd -f

Answer

rsyslogd -v

Question 2

You are a system administrator for a small company running a web server on Ubuntu 20.04 LTS. The web server application was installed using apt from the official repositories. Recently, a critical security patch was released for the web server package. You run 'apt update' and 'apt upgrade' but the package is not upgraded. You check the package status with 'apt-cache policy <package>' and see that the installed version is 2.4.41-4ubuntu3.6, and the candidate version is the same. The latest patched version in the repository is 2.4.41-4ubuntu3.7. You verify that the system has internet connectivity and that the repository URLs in /etc/apt/sources.list are correct. What is the most likely reason the upgrade is not being offered?

Accepted Answer

Run 'apt-mark unhold ' and then 'apt upgrade'.. The most likely reason is that the package has been placed on hold using 'apt-mark hold', which prevents it from being upgraded even when a newer version is available in the repository. Running 'apt-mark unhold ' removes this hold, allowing 'apt upgrade' to proceed normally.

Answer

Add the universe repository to sources.list and run 'apt update'.

Answer

Use 'apt dist-upgrade' instead of 'apt upgrade'.

Answer

Run 'apt install <package>' which will force the upgrade.

Question 3

An administrator needs to extend a logical volume by 10GB. The volume group has available physical extents. Which command should be used?

Accepted Answer

lvextend -L +10G /dev/vg/lv. The `lvextend` command with the `-L +10G` flag increases the size of the existing logical volume `/dev/vg/lv` by exactly 10 GB, using available physical extents from the volume group. This is the standard LVM command for extending a logical volume without recreating it.

Answer

lvcreate -L 10G /dev/vg/lv

Answer

vgextend /dev/vg/lv -L +10G

Answer

lvresize -L 10G /dev/vg/lv

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

An administrator notices that a large file on an ext4 filesystem is taking up more disk space than expected based on its size. Which command would show the actual disk usage (block allocation) of the file?

Accepted Answer

du -h. (du -h) is correct because du (disk usage) reports the actual disk space consumed by a file, including allocated blocks, which can be larger than the file's logical size due to block size overhead, fragmentation, or sparse file handling. On ext4, the default block size is 4096 bytes, so a 1-byte file occupies 4096 bytes on disk, and du reflects this allocation.

Answer

ls -l

Answer

df -h

Answer

stat

Question 6

Refer to the exhibit. A user runs 'python --version' and gets 'Python 3.9.1'. Which command would run Python 2 instead?

Accepted Answer

python2. On many Linux distributions, Python 2 and Python 3 are installed side by side, with the `python` command typically linked to Python 2 (or sometimes Python 3, depending on the distribution). However, in this scenario, `python --version` returns 'Python 3.9.1', indicating that `python` is linked to Python 3. To explicitly run Python 2, you must use the `python2` command, which is the standard binary name for Python 2.x installations.

Answer

python --version2

Answer

python3

Answer

python2 --version

Question 7

A company's server administrator needs to replace an existing DNS server (192.168.1.10) with a new one (192.168.1.20). Which file must be updated on all DHCP clients to ensure they use the new DNS server?

Accepted Answer

/etc/dhcp/dhcpd.conf. The DHCP server configuration file /etc/dhcp/dhcpd.conf contains the 'option domain-name-servers' directive that specifies which DNS servers are handed out to DHCP clients. When a client renews its lease, it receives the new DNS server IP (192.168.1.20) from the DHCP server, updating the client's /etc/resolv.conf automatically. This is the proper way to centrally manage DNS server assignments across all DHCP clients.

Answer

/etc/resolv.conf

Answer

/etc/nsswitch.conf

Answer

/etc/hosts

Question 8

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 9

Refer to the exhibit. A user tries to write to /mnt/usb/myfile.txt as a non-root user and receives a permission denied error. What is the most likely reason?

Accepted Answer

The vfat filesystem does not support Unix permissions, and the mount options (fmask/dmask) restrict write access to root only. The vfat filesystem does not store Unix-style permissions; instead, it relies on mount options like fmask and dmask to set the effective permissions for all files and directories. If these masks are set to restrict write access to root only (e.g., fmask=0133), non-root users will receive a 'permission denied' error even if the filesystem is mounted read-write. This is a common cause of write failures on USB drives formatted with FAT/VFAT.

Answer

The filesystem is mounted read-only

Answer

The filesystem is mounted with the 'noexec' option, preventing write

Answer

The file's permissions are 644, so the user does not have write access

Question 10

A database server on a Linux system is configured to listen on TCP port 3306. The administrator wants to restrict access to the database server to only the local network (192.168.1.0/24) using iptables. Which of the following iptables rules achieves this?

Accepted Answer

iptables -A INPUT -p tcp --dport 3306 -s 192.168.1.0/24 -j ACCEPT. It adds an INPUT chain rule that accepts TCP traffic destined for port 3306 only when the source address is within the 192.168.1.0/24 subnet. This effectively restricts incoming database connections to the local network, while all other sources are implicitly dropped by the default INPUT policy or subsequent rules.

Answer

iptables -A INPUT -p tcp --dport 3306 -d 192.168.1.0/24 -j DROP

Answer

iptables -A OUTPUT -p tcp --dport 3306 -d 192.168.1.0/24 -j ACCEPT

Answer

iptables -A OUTPUT -p tcp --sport 3306 -s 192.168.1.0/24 -j ACCEPT