Red Hat Certified Engineer Ex300 Practice Test - Set 1

Test your knowledge with this Red Hat Certified Engineer Ex300 mock exam. Get real-world IT questions and prepare for certification success.

EX300: Red Hat Certified Engineer (RHCE) - Exam Information

Exam Information

Exam Code

Red Hat Certified Engineer Ex300

Exam Title

EX300: Red Hat Certified Engineer (RHCE)

Vendor

Red Hat

Difficulty

Advanced

Duration

3.5 Hours

Question Format

Multiple Choice

Last Updated

February 23, 2025

The EX300 exam is intended for experienced Linux administrators seeking to validate their skills as a Red Hat Certified Engineer (RHCE).

Practice Test

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1. Which service is used for managing SELinux policies?

semanage

firewalld

systemctl

selinuxctl

2. Which command is used to configure and manage firewall rules in RHEL 8?

firewall-cmd

iptables

nft

ufw

3. Which file stores persistent network interface configuration in RHEL?

/etc/sysconfig/network-scripts/

/etc/network/interfaces

/etc/netplan/

/etc/network.d/

4. Which command is used to troubleshoot SELinux denials?

ausearch -m AVC

dmesg | grep selinux

journalctl -u selinux

sestatus -v

5. Which command is used to set up a software RAID in Linux?

mdadm

raidctl

lvmraid

mkraid

6. Which command is used to list all SELinux booleans?

getsebool -a

seinfo -b

selinux-booleans

sestatus --booleans

7. Which tool is used to manage logical volumes in Linux?

lvcreate

vgextend

fsck

mkfs

8. Which command is used to enable a service to start on boot?

systemctl enable

service enable

chkconfig on

initctl enable

9. Which tool is used to monitor system logs in real-time?

journalctl -f

dmesg

syslogd

logread

10. Which command is used to create an LVM volume group?

vgcreate

lvcreate

mkfs.ext4

vgextend

11. Which command is used to display SELinux context of files?

ls -Z

sestatus

getsebool

semodule -l

12. Which command is used to restart the networking service in RHEL 8?

systemctl restart NetworkManager

service network restart

systemctl restart networking

networkctl restart

13. Which command is used to check active network connections?

ss -tuln

netstat -r

ip route show

ifconfig -a

14. Which command is used to create a new partition in Linux?

fdisk

mkfs.ext4

parted

pvcreate

15. Which command is used to resize a logical volume in LVM?

lvresize

vgextend

pvresize

lvextend

16. Which command is used to enable IP forwarding in Linux?

echo 1 > /proc/sys/net/ipv4/ip_forward

sysctl -w net.ipv4.forward=1

ip_forward enable

netctl forward enable

17. Which command is used to apply SELinux policies?

restorecon

chcon

semanage apply

selinuxpolicy -apply

18. Which file contains information about mounted file systems?

/etc/fstab

/etc/mtab

/proc/mounts

/var/log/mounts

19. Which command is used to check disk space usage?

df -h

du -sh

lsblk

fdisk -l

20. Which tool is used to update all installed packages in RHEL 8?

dnf update

yum update

apt upgrade

rpm -Uvh

21. Which command is used to force a user logout in Linux?

pkill -KILL -u username

killall username

logout -f username

terminate username

22. Which file is used to configure GRUB bootloader settings?

/etc/default/grub

/boot/grub.cfg

/etc/grub.conf

/boot/grub/menu.lst

23. Which command is used to verify the integrity of an RPM package?

rpm -V

dnf check

yum verify

rpm --validate

24. Which command is used to start a service in systemd?

systemctl start

service start

initctl start

runlevel start

25. Which tool is used to manage containerized applications in RHEL 8?

podman

docker

lxc

rkt

26. Configure firewalld to allow HTTP and HTTPS traffic permanently

firewall-cmd --permanent --add-service=http --add-service=https && firewall-cmd --reload

iptables -A INPUT -p tcp --dport 80,443 -j ACCEPT

echo "http https" > /etc/firewalld/allowed_services

setsebool -P httpd_can_network_connect 1

27. Create a 5GB logical volume named "data_lv" in volume group "vg_data"

lvcreate -n data_lv -L 5G vg_data

lvm create -n data_lv -s 5G -g vg_data

mkvol -n data_lv -v vg_data -s 5G

vgcreate -n data_lv -s 5G vg_data

28. Configure SELinux to allow Apache to connect to a non-standard port 8080

semanage port -a -t http_port_t -p tcp 8080

setsebool -P httpd_use_nonstandard_port 1

echo "8080 http_port_t" >> /etc/selinux/ports

chcon -t http_port_t 8080

29. Create an ext4 filesystem on /dev/vg_data/data_lv and mount it persistently at /data

mkfs.ext4 /dev/vg_data/data_lv && echo "/dev/vg_data/data_lv /data ext4 defaults 0 0" >> /etc/fstab && mount -a

format /dev/vg_data/data_lv ext4 && automount /data

newfs -t ext4 /dev/vg_data/data_lv /data

mkfs -t ext4 /dev/vg_data/data_lv && mount /dev/vg_data/data_lv /data

30. Configure NFS to share /shared with 192.168.1.0/24 with read/write access

Add "/shared 192.168.1.0/24(rw,sync)" to /etc/exports && exportfs -a

echo "192.168.1.0/24:/shared rw" > /etc/nfs.conf

nfsshare add /shared -net 192.168.1.0/24 -perm rw

share -p nfs -o rw=192.168.1.0/24 /shared

31. Configure a cron job that runs /usr/local/bin/backup.sh every Sunday at 3 AM

crontab -e then add "0 3 * * 0 /usr/local/bin/backup.sh"

echo "0 3 * * 0 /usr/local/bin/backup.sh" >> /etc/crontab

addcron -d sunday -h 3 /usr/local/bin/backup.sh

schedule -t weekly -d 0 -h 3 /usr/local/bin/backup.sh

32. Configure the system to use 192.168.1.1 as its default gateway

ip route add default via 192.168.1.1

route add default gw 192.168.1.1

echo "GATEWAY=192.168.1.1" >> /etc/sysconfig/network

netconfig set gateway 192.168.1.1

33. Create a VDO volume named "vdo1" with 50GB physical size and 100GB logical size

vdo create --name=vdo1 --device=/dev/sdb --vdoLogicalSize=100G

mkvdo -n vdo1 -d /dev/sdb -p 50G -l 100G

vdocreate vdo1 /dev/sdb 50G 100G

createvdo --name vdo1 --size 50G --logical 100G

34. Configure a systemd service that restarts automatically if it fails

Add "Restart=on-failure" to the [Service] section in the unit file

systemctl enable autorestart servicename

echo "autorestart=true" >> /etc/systemd/service.conf

servicecfg set servicename autorestart=on

35. Configure a user "admin" to have passwordless sudo access

Add "admin ALL=(ALL) NOPASSWD:ALL" to /etc/sudoers

usermod -aG wheel admin

echo "admin" >> /etc/sudoers.nopasswd

setpriv admin +sudo-nopasswd

36. Configure a MariaDB database to listen on port 3307 instead of 3306

Edit /etc/my.cnf.d/mariadb-server.cnf and add "port = 3307" under [mysqld] section

mysqladmin --port=3307

setsebool -P mysql_port_3307=1

echo "3307" > /etc/mysql/port

37. Configure a Podman container to run Nginx on host port 8080

podman run -d --name nginx -p 8080:80 nginx

container start nginx -p 8080:80

podman create -e PORT=8080 nginx

docker run -p 8080 nginx

38. Configure a custom SELinux policy to allow Apache to write to /var/www/html/uploads

semanage fcontext -a -t httpd_sys_rw_content_t "/var/www/html/uploads(/.*)?" && restorecon -Rv /var/www/html/uploads

chcon -t httpd_sys_content_t /var/www/html/uploads

setsebool -P httpd_write_content 1

selinux allow httpd /var/www/html/uploads w

39. Configure a RAID 1 array using /dev/sdc and /dev/sdd

mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdc /dev/sdd

raidcreate /dev/md0 raid1 /dev/sdc /dev/sdd

mkraid /dev/md0 -l 1 -d /dev/sdc /dev/sdd

mdadm -C /dev/md0 -n 2 -l mirror /dev/sdc /dev/sdd

40. Configure the system to log all failed SSH login attempts to /var/log/ssh_fails.log

Add "auth.* /var/log/ssh_fails.log" to /etc/rsyslog.conf and restart rsyslog

echo "LogLevel VERBOSE" >> /etc/ssh/sshd_config

auditctl -w /usr/sbin/sshd -p wa -k sshd_logins

Add "session required pam_faillog.so silent audit deny=3" to /etc/pam.d/sshd

41. Configure a systemd timer that runs /usr/local/bin/backup.sh daily at 2 AM

Create a .timer unit with OnCalendar=daily 02:00:00 and associate with a .service file

echo "0 2 * * * /usr/local/bin/backup.sh" > /etc/cron.d/backup

systemd-timer create --name=backup --on-calendar="02:00:00"

timed --add-job --command="/usr/local/bin/backup.sh" --daily --at=2am

42. Configure a network bond using interfaces eth0 and eth1 with mode 802.3ad

Create bond0 config in /etc/sysconfig/network-scripts/ with BONDING_OPTS="mode=4"

nmcli con add type bond ifname bond0 mode 802.3ad

ifenslave bond0 eth0 eth1

bondcreate --name=bond0 --mode=802.3ad eth0 eth1

43. Configure a Kerberos-authenticated NFSv4 share

Add "sec=krb5p" to the export options in /etc/exports and configure Kerberos principals

nfssec --enable kerberos

authconfig --enablenfsv4krb5 --update

echo "AUTH_GSS" > /etc/nfs.conf

The Red Hat Certified Engineer Ex300 certification is a globally recognized credential for IT professionals. This practice test helps you prepare by covering key topics like hardware, networking, troubleshooting, and security.

Want more practice? Check out our other mock exams:

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Red Hat Certified Engineer Ex300 Practice Test - Set 1

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