LPIC-1 Practice Test 4 — 25 Questions

Question 1

Based on the exhibit, what will happen if the syslog service is stopped?

Accepted Answer

Apache2 will continue running because the dependency is a soft dependency. Option D is correct because in Linux, services managed by systemd can have dependencies declared as 'Requires' (hard) or 'Wants' (soft). A soft dependency means that the dependent service (Apache2) does not require the target service (syslog) to be running; it will continue to operate even if syslog is stopped. The exhibit likely shows a 'Wants' directive, which does not enforce a strict ordering or runtime requirement.

Answer

Apache2 will be stopped because it depends on syslog

Answer

The system will prompt to restart syslog before stopping

Answer

Apache2 will be automatically restarted because it requires syslog

Question 2

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 3

A system administrator wants to schedule a script to run every Monday at 3:00 AM, but only if the system clock is set to local time (not UTC). Which crontab entry should be used?

Accepted Answer

0 3 * * 1 /path/to/script. Option B is correct because the crontab format is 'minute hour day-of-month month day-of-week command'. To run at 3:00 AM Monday, the minute field is 0, the hour field is 3 (using 24-hour time), and the day-of-week field is 1 (Monday). The cron daemon does not care about UTC vs local time; it uses the system's configured timezone, so no special flag is needed.

Answer

3 0 * * 1 /path/to/script

Answer

0 15 * * 1 /path/to/script

Answer

0 3 * * 0 /path/to/script

Question 4

Based on the exhibit, which of the following is true about the cleanup.sh job?

Accepted Answer

It runs at 4:30 AM on Monday through Friday. The cron expression `30 4 * * 1-5` specifies that the job runs at minute 30, hour 4 (4:30 AM), every day of month (*), every month (*), but only on days of the week 1 through 5 (Monday=1, Tuesday=2, Wednesday=3, Thursday=4, Friday=5). Therefore, the job runs at 4:30 AM on Monday through Friday.

Answer

It runs at 4:30 AM every day

Answer

It runs at 4:00 AM on weekdays

Answer

It runs at 4:30 AM on weekends

Question 5

Which THREE of the following statements are true about the /etc/shadow file?

Accepted Answer

It can contain password expiration information. The /etc/shadow file stores password expiration information, such as the last password change date, minimum and maximum password age, warning period, and inactivity period. This data is used by the system to enforce password aging policies, making option B correct.

Answer

It contains the encrypted passwords in the second field, replacing the 'x' in /etc/passwd

Answer

It is world-readable to allow any user to verify passwords

Question 6

A user reports that they cannot connect to a remote server using SSH. The administrator checks the SSH server status and it is running. Which of the following is the most likely cause?

Accepted Answer

A firewall is blocking port 22.. SSH operates over TCP port 22 by default. If the SSH server is running but the client cannot connect, a firewall blocking port 22 is the most likely cause because it would prevent the TCP handshake from completing, even though the SSH daemon (sshd) is active and listening.

Answer

The client's subnet mask is incorrect.

Answer

The client cannot resolve the server's hostname.

Answer

The SSH server is using UDP instead of TCP.

Question 7

Refer to the exhibit. The administrator wants to ensure that SSH service starts automatically after a system reboot. Based on the output, what is the current status of this setting?

Accepted Answer

The service is enabled and will start at boot.. The `systemctl is-enabled sshd` command returns 'enabled', which means the SSH service is configured to start automatically at boot. This is confirmed by the output in the exhibit, showing that the service is enabled and will start during system initialization.

Answer

The service is disabled and will not start at boot.

Answer

The service is static and cannot be enabled.

Answer

The service is not running.

Question 8

A system administrator notices that the NTP service on a Linux server is not synchronizing time with external NTP servers. The administrator runs 'ntpq -p' and sees that all servers listed have a 'reach' value of 0. Which of the following is the most likely cause?

Accepted Answer

A firewall is blocking UDP port 123.. The `reach` value of 0 in `ntpq -p` output indicates that the NTP client has received no responses from any of the configured servers. Since NTP uses UDP port 123 for communication, a firewall blocking this port would prevent the client from sending or receiving NTP packets, resulting in zero reachability. This is the most common cause when all servers show a reach of 0.

Answer

The system timezone is incorrectly set.

Answer

The NTP service is configured to use the local clock.

Answer

The NTP server is using a different NTP version.

Question 9

A web server running Apache on Linux is experiencing slow response times. The administrator runs 'netstat -tuln' and sees many connections in TIME_WAIT state. Which of the following is the best course of action to improve performance?

Accepted Answer

Enable TCP keepalive and adjust kernel parameters for faster reuse.. Option C is correct because TIME_WAIT connections indicate that the server is waiting for lingering packets before fully closing TCP sockets. Enabling TCP keepalive and adjusting kernel parameters like net.ipv4.tcp_tw_reuse (or net.ipv4.tcp_tw_recycle in older kernels) allows the kernel to reuse sockets in TIME_WAIT state for new connections, reducing resource exhaustion and improving performance under high connection rates.

Answer

Increase the KeepAliveTimeout directive.

Answer

Disable the KeepAlive directive.

Answer

Increase the MaxKeepAliveRequests directive.

Question 10

Which of the following commands will display the default gateway of a Linux system?

Accepted Answer

ip route show. The `ip route show` command displays the kernel routing table, which includes the default gateway as a default route (typically `default via <gateway-IP>`). This is the standard modern tool for viewing routing information on Linux systems.

Answer

arp -a

Answer

netstat -i

Answer

ifconfig

Question 11

Which TWO of the following are valid methods to configure network interfaces on a Linux system? (Choose two.)

Accepted Answer

Editing /etc/network/interfaces file.. Option A is correct because the `/etc/network/interfaces` file is the primary configuration file for network interfaces on Debian-based Linux distributions (e.g., Ubuntu). It allows static or dynamic (DHCP) configuration of interfaces using directives like `iface`, `address`, and `netmask`, and is read by the `ifup` and `ifdown` commands at boot or on demand.

Answer

Using the 'ifconfig' command.

Answer

Using the 'route' command.

Answer

Editing /etc/sysconfig/network-scripts/ network configuration files.

Question 12

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. Option C is correct because 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

Question 13

Which THREE of the following are true regarding the use of systemd-networkd for network configuration? (Choose three.)

Accepted Answer

It can assign static IP addresses using .network files.. Option A is correct because systemd-networkd uses .network files (e.g., /etc/systemd/network/10-static.network) to assign static IP addresses via the [Address] section. This allows precise control over IPv4/IPv6 addresses, subnet masks, and gateways without relying on DHCP.

Answer

Configuration files are stored in /etc/network/.

Answer

It supports bonding of multiple interfaces.

Question 14

Which TWO of the following commands can be used to list all installed packages on a Debian-based system?

Accepted Answer

apt list --installed. Option B is correct because `apt list --installed` is a modern APT command that lists all installed packages on Debian-based systems. Option D is correct because `dpkg -l` displays the status and names of all packages known to dpkg, including those installed, effectively listing installed packages.

Answer

apt-get check

Answer

apt-cache showpkg

Answer

dpkg --get-selections

Question 15

Which directory contains the kernel modules for the currently running kernel?

Accepted Answer

/lib/modules/$(uname -r). The correct answer is D because the kernel modules for the currently running kernel are stored in /lib/modules/$(uname -r). The uname -r command returns the exact kernel release version, and the corresponding directory contains all loadable kernel modules (.ko files) compiled for that specific kernel. This is the standard location used by the kernel and tools like modprobe and insmod to locate and load modules.

Answer

/boot

Answer

/etc/modprobe.d

Answer

/usr/src

Question 16

Refer to the exhibit. A user gets this error when running a script. What is the most likely cause?

Accepted Answer

The script has Windows-style line endings (CRLF).. The error message shown in the exhibit (typically '/bin/bash^M: bad interpreter' or similar) indicates that the script contains carriage return characters (CR, \r) at the end of lines, which is characteristic of Windows-style CRLF line endings. When Linux's Bash tries to interpret the shebang line, it sees '/bin/bash^M' as the interpreter path, which does not exist, causing the script to fail. This is a common issue when scripts are created or edited on Windows and then transferred to a Unix-like system without converting line endings.

Answer

The script is missing a shebang line.

Answer

The script does not have execute permission.

Answer

The script contains a syntax error in line 3.

Question 17

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 18

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 19

Match each networking tool to its primary use.

Accepted Answer

ping: Test connectivity to a remote host. The correct matches are: ping for connectivity testing, ifconfig for interface configuration, and traceroute for path tracing. Common confusions include swapping netstat and nslookup definitions, or mistaking traceroute's purpose for ping's.

Answer

netstat: Query DNS name servers for host information

Answer

nslookup: Display network connections and routing tables

Answer

traceroute: Test connectivity to a remote host

Question 20

Which TWO commands can be used to display network interface statistics on a Linux system?

Accepted Answer

netstat -i. Option D (netstat -i) is correct because it displays a table of network interface statistics, including packets transmitted and received, errors, and drops. Option E (ifconfig) is correct because when invoked without arguments, it shows the status of active interfaces, including statistics like TX/RX packets and errors. Both commands are traditional tools for viewing interface-level network statistics.

Answer

route -n

Answer

ss -s

Answer

ip -s link

LPIC-1 Practice Test 4 — 25 Questions

Exhibit

LPIC-1 Practice Test 4 — 25 Questions

Exhibit