Deploy, configure, and maintain systems

A system administrator needs to ensure that a specific kernel module 'usb_storage' is not loaded automatically during boot on a RHEL 9 system. Which configuration file should be modified to blacklist this module?

A Red Hat Enterprise Linux 9 system has a logical volume 'lv_data' in the volume group 'vg_data' that needs to be resized from 10G to 15G. The underlying physical volumes have enough free space. Which sequence of commands correctly resizes the logical volume and the ext4 filesystem?

A technician needs to configure a static IPv4 address on a RHEL 9 network interface 'enp1s0' using NetworkManager. Which command should be used to set the IP address?

A system administrator is tasked with configuring a RHEL 9 system to automatically mount an NFS share from 192.168.1.10:/export/data on /mnt/data at boot. Which entry in /etc/fstab is correct?

A system administrator notices that a RHEL 9 server's /var/log/messages is filling up the /var partition. The administrator wants to ensure log rotation runs daily and keeps 4 weeks of logs. Which configuration file should be modified?

A user reports that they cannot log in to a RHEL 9 system. The administrator checks /etc/passwd and finds the user's shell is set to /sbin/nologin. What is the most likely cause?

An administrator wants to install a package 'httpd' but only if it is available in the configured repositories. Which command should be used to check if the package exists?

A RHEL 9 system has a second disk /dev/sdb that needs to be partitioned with a single partition using all space, formatted with XFS, and mounted persistently at /data. The administrator uses fdisk to create the partition /dev/sdb1. Which filesystem creation command should be used?

Which TWO statements are true about systemd services in RHEL 9? (Choose exactly two.)

Which THREE are valid methods to configure network bonding in RHEL 9? (Choose exactly three.)

Which TWO are correct ways to check the SELinux context of a file named 'test.txt'? (Choose exactly two.)

Refer to the exhibit. The service 'example.service' is created but fails to start. The administrator runs 'systemctl start example.service' and gets no output, but 'systemctl status example.service' shows 'active (exited)'. What is the most likely cause?

Refer to the exhibit. The administrator wants to add an additional 5GB to the /mnt/data filesystem. There is no unpartitioned space on /dev/sdb. Which is the correct procedure?

A company has a RHEL 9 server that hosts a critical application. The server has two network interfaces: enp1s0 (192.168.1.100/24) and enp2s0 (10.0.0.100/24). The default gateway is 192.168.1.1. The application listens on a TCP port 8080 and should be accessible from both networks. Recently, the administrator noticed that clients on the 10.0.0.0/24 network can ping the server's 10.0.0.100 address but cannot connect to port 8080. Clients on 192.168.1.0/24 can connect fine. The firewall is configured with the default zone (public) and the service 'http' is allowed, but port 8080 is not specifically allowed. The administrator checks 'firewall-cmd --list-all' and sees that only services 'ssh' and 'http' are listed. The application is running and listening on 0.0.0.0:8080. What is the most likely cause and the correct course of action?

A system administrator needs to ensure that a web server running Apache httpd starts automatically after a system reboot. Which command should the administrator use to enable the httpd service?

Which TWO commands can be used to display the current SELinux mode?

An administrator runs 'df -h' and sees the output above. The /data partition is nearly full. Which command will help identify the largest files in /data?

Order the steps to configure SELinux to allow Apache to read files in a custom directory /webcontent.

Match each SELinux mode to its behavior.

An administrator needs to configure a service to start automatically at boot and also start it immediately without rebooting. Which single command accomplishes both tasks?

A user is unable to log in via SSH. The administrator checks /var/log/secure and sees 'Authentication refused: bad ownership or modes' for the user's home directory. What is the most likely cause?

A system has a new disk /dev/sdb that needs to be used as an LVM physical volume for an existing volume group 'vg_data'. Which sequence of commands is correct?

A cron job runs a script every hour and leaves many log files. The administrator wants to clean up log files older than 7 days in /var/log/myapp/. Which command should be added to a weekly cron job?

An administrator needs to ensure that a mounted NFS filesystem is not accessible to users without proper Kerberos authentication, even if the NFS server exports with no_root_squash. Which mount options should be used in /etc/fstab?

A system fails to boot and drops into an emergency shell. The administrator suspects a misconfigured /etc/fstab. Which command should be used to determine which filesystem is causing the boot issue?

A user reports that they cannot create files in their home directory. The administrator checks permissions and sees drwxr-xr-x. What is the likely cause?

An administrator wants to temporarily disable the firewalld service for troubleshooting. Which command will stop the service and prevent it from starting on subsequent boots?

An administrator needs to add a 2GB swap file to a system that already has swap partitions. Which set of commands will create and activate the swap file correctly?

Which TWO commands can be used to display available disk space on mounted filesystems in a human-readable format?

An administrator needs to configure a static IP address on an interface that will persist across reboots using NetworkManager. Which TWO commands or files can be used to achieve this?

On a default Red Hat Enterprise Linux 8 installation, which THREE tools or files can be used to configure time synchronization?

Refer to the exhibit. Which entry is most likely to cause the system to fail to boot if the NFS server is unavailable?

Refer to the exhibit. A user 'alice' is unable to write to /data directory. What is the most likely reason?

Refer to the exhibit. Which command will ensure cron jobs run automatically at system boot?

A technician needs to configure a network interface to use a static IP address permanently. Which command should be used in RHEL 9?

A cron job fails to run. Which command should the administrator use to verify the cron daemon is active?

An administrator wants to enable disk quotas for users on an XFS filesystem. Which command initializes the quota database?

A user reports that they cannot start a service. Which command would an administrator use to view the service's journal logs since last boot?

A system has a disk that may be failing. Which tool can be used to check the health of a SATA disk using SMART monitoring?

An administrator needs to configure system tuning profiles for a database server. Which command is used to set the 'throughput-performance' profile?

A technician needs to create a new group named 'developers' with GID 5000. Which command accomplishes this?

An administrator extends a logical volume by 5GB. The filesystem is XFS. Which command must be run to make the additional space available?

A system fails to boot with an error about a missing ext4 filesystem. From the rescue environment, which command should be run to attempt automatic repair of all filesystems?

Which TWO commands can be used to display the current SELinux mode?

Which THREE of the following are common steps to configure a system to automatically mount an NFS share at boot?

Which TWO files are essential in the /boot directory for the kernel to boot?

Refer to the exhibit. An administrator needs to free up space in the /backup filesystem. Which of the following actions would be MOST effective?

Refer to the exhibit. A web server must also accept HTTPS traffic on port 8443. Which command should the administrator run to permanently open this port?

Refer to the exhibit. The SSH service has been running for 2 weeks. An administrator wants to restart the service without interrupting existing SSH connections. Which command should they use?

An administrator needs to ensure that the httpd service starts automatically after a system reboot and is set to start immediately without rebooting. Which command should be used?

A system administrator needs to restore the default SELinux security context on all files under /var/www/html after a misconfiguration. Which command should be used?

An administrator has a logical volume 'lv_data' in a volume group 'vg_data' with a filesystem. The administrator needs to reduce the size of 'lv_data' by 2GB. Which sequence of commands should be performed?

A system administrator wants to allow incoming HTTPS traffic on the default zone of firewalld. Which command should be used?

An administrator wants to optimize system performance for a database workload. Which tool should be used to select a performance profile?

An administrator needs to create a network bond interface 'bond0' with two slave interfaces 'eth0' and 'eth1' using active-backup mode. Which set of commands is correct?

An administrator needs to set up an automount point for NFS shares from server nfs.example.com:/exports/backup. The mount point should be /backup and should mount on access. Which configuration is correct?

An administrator wants to view only the error messages from the kernel ring buffer since last boot. Which command should be used?

A system fails to boot because of a corrupted fstab file. The administrator boots into rescue mode from a RHEL installation ISO. Which command should be run first to mount the root filesystem read-write?

Which two commands correctly set the system to boot into a multi-user target (runlevel 3)?

Which three of the following are required steps to create a new logical volume of 5GB in an existing volume group 'vg00'?

Which two statements are true regarding network teaming (teamd) compared to bonding?

Refer to the exhibit. An administrator is unable to write to /tmp because the filesystem is full. What is the most likely cause?

Refer to the exhibit. An administrator sees that a user from 192.168.1.101 cannot connect to the SSH server. Based on the log, what is the most probable cause?

A Red Hat Enterprise Linux 8 system was recently updated via 'yum update'. After reboot, the systemd-logind service fails to start with the error 'Failed to start Login Service' and 'Permission denied' messages in the journal. The administrator checks the SELinux status with 'getenforce' and it returns 'Enforcing'. The administrator also notices that the '/var/run' directory is now a symlink to '/run'. There are no firewall issues. The service works if SELinux is set to permissive. Which single action should the administrator take to resolve this issue permanently?

An administrator needs to create a 10GB logical volume named 'mylv' in an existing volume group 'vg1', format it with XFS, and mount it at /mnt/data. Which set of commands achieves this correctly?

A web server running Apache (httpd) on RHEL 9 serves content from /var/www/custom. Clients get a 403 error. The SELinux context on files is system_u:object_r:default_t:s0. Which command resolves the issue persistently without disabling SELinux?

A system administrator wants to permanently allow incoming HTTP traffic on RHEL 9 using firewalld. Which two commands will achieve this? (Choose two.)

An administrator wants to change the default systemd target to multi-user.target. Which three steps are part of a correct procedure? (Choose three.)

A system administrator is troubleshooting a RHEL 9 server that fails to boot and drops into emergency mode. The system console shows an error about mounting /dev/sdb1 on /data. The administrator enters emergency mode, checks /etc/fstab, and sees the line: /dev/sdb1 /data ext4 defaults 0 0. The /data directory exists but /dev/sdb1 is a partition on an external USB drive that was removed. The administrator needs the system to boot normally without the USB drive and plans to fix the mount configuration later. Which course of action should the administrator take?

A developer deploys a container using podman with a bind mount to persist web content. They run: podman run -d --name web -v /webdata:/usr/local/apache2/htdocs:Z -p 8080:80 httpd:latest. The container fails to start. The journal shows SELinux denials for the httpd process inside the container trying to read files with context httpd_sys_content_t, while the process runs in container_t domain. The host directory /webdata exists and contains index.html. The administrator checks that the container image is standard. What is the most likely cause of the failure?

A junior system administrator configures rsyslog on a RHEL 9 server to forward logs to a remote centralized log server. They add the line *.* @192.168.1.100:514 to /etc/rsyslog.conf and restart rsyslog with systemctl restart rsyslog. Local logging works fine, but the remote server does not receive any logs. The administrator checks the local firewall and confirms that UDP port 514 is open outbound. They also verify network connectivity using nc. What is the most likely cause?

A systems administrator installs a custom hardware device driver kernel module named 'mydevice' on a RHEL 9 system. The module is built and placed in /lib/modules/$(uname -r)/extra/. The administrator loads it manually with modprobe mydevice and it works. However, after a system reboot, the module is not loaded. The administrator checks that the device is present at boot time. Which step should be taken to ensure the module loads automatically at boot?