scenario questions

Which THREE of the following commands can be used to display information about file systems?

What is the default filesystem type in Red Hat Enterprise Linux 8?

Based on the exhibit, which command should be used to start the container named 'mycontainer'?

A system administrator needs to allow members of the 'developers' group to run any command as root without being prompted for a password. Which sudoers configuration line should be added?

Which TWO commands can change the primary group of an existing user?

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?

In /etc/fstab, which values in the dump and pass fields enable automatic file system checking at boot?

An administrator attempts to mount an XFS filesystem from /dev/sdc1 to /mnt/archive but receives the error: 'mount: /mnt/archive: wrong fs type, bad option, bad superblock on /dev/sdc1, missing codepage or helper program, or other error.' The output of 'dumpe2fs /dev/sdc1' shows 'dumpe2fs: Bad magic number in super-block while trying to open /dev/sdc1'. What is the most likely problem?

You are managing a Red Hat Enterprise Linux 9 server that hosts a critical database application. The database stores its data on an XFS filesystem mounted on /data, backed by a logical volume in a volume group named vg_db. Recently, the database team reported that write operations are failing with 'Disk quota exceeded' errors, but the filesystem still shows 40% free space. You check the filesystem quota configuration and find that no user or group quotas are set on /data. The database runs as user 'dbadmin' with group 'dba'. Which of the following is the most likely cause of the 'Disk quota exceeded' error?

A partition /dev/sdc1 is formatted as ext4. The administrator needs to check the file system for errors without making any repairs. Which command should be used?

An administrator needs to create a user account that will be used by an application service. The account should not have a valid shell or home directory. Which command correctly creates such an account?

A system administrator needs to ensure that data written to a container's `/var/lib/mysql` directory persists after the container is removed. Which TWO methods accomplish this requirement?

Refer to the exhibit. A user named 'carol' has been added to the system with the command useradd -G wheel carol. Which line in /etc/group will confirm that carol is now a member of the wheel group?

Match each cron syntax field to its meaning.

What does the 's' in the owner execute position indicate?

Which command can be used to display a list of all currently mounted filesystems on a Linux system?

A system administrator needs to extend a logical volume 'lv_data' in volume group 'vg_data' by adding a new 50GB disk. Which sequence of commands should be used (assuming the filesystem is XFS)?

A system administrator runs the following command: # vgextend mydata-vg /dev/sdc. After successfully extending the volume group, what is the next step to make the additional space available in the logical volume mydata-lv?

An administrator writes a script that uses the 'set -e' option at the top. What is the primary effect of this option?

A file has been assigned an incorrect SELinux context, preventing a service from accessing it. Which command restores the default SELinux context for that file?

A system administrator writes a shell script to monitor disk usage and send an alert if any partition exceeds 80%. Which TWO of the following are best practices for implementing this script?

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?

Order the steps to configure firewall rules to allow HTTP and HTTPS traffic using firewalld.

A container is running but cannot be accessed from the network. Which TWO commands could help diagnose the issue? (Select exactly two.)

An administrator needs to grant user 'dev' the ability to execute /usr/local/bin/deploy.sh as root without a password, but no other commands. Which sudoers entry accomplishes this?

A system administrator wants to run a container that uses the rootless mode available in Podman. Which requirement must be met for rootless containers to work correctly?

An administrator needs to combine two physical network interfaces into a single logical interface for redundancy. Which RHEL tool is recommended to configure this in RHEL 8/9?

Which THREE of the following mount options are commonly used to enhance security on a filesystem?

A system fails to mount an XFS filesystem at boot. The /etc/fstab entry is: UUID=abc123 /mnt xfs defaults 0 0. Running mount -a shows: 'mount: wrong fs type, bad option, bad superblock on /dev/sdb1'. Which is the most likely cause?

Which TWO of the following commands can be used to create an XFS filesystem on a block device?

A team wants to run a container as a non-root user inside the container for security. Which instruction should be included in the Containerfile?

A script has a syntax error. Which command will help identify the line number of the error without executing the script?

A system administrator is managing a Red Hat Enterprise Linux 9 web server running Apache httpd. The server hosts a custom application that stores its files in /var/www/custom. The administrator has set ownership to apache:apache and file permissions to 755. However, when users access the web application, they receive a 'Forbidden' error. The httpd service is running, and SELinux is in enforcing mode. The administrator checks the SELinux context of the /var/www/custom directory and sees 'unconfined_u:object_r:default_t:s0'. What should the administrator do to resolve the issue without disabling SELinux?

A user needs to find all files with the '.conf' extension under /etc. Which command should be used?

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 THREE of the following are valid utilities for creating partitions on a disk in Red Hat Enterprise Linux?

Which command displays the current system time, timezone, and whether NTP synchronization is active?

Which TWO commands can list all groups a user belongs to? (Choose exactly 2)

Refer to the exhibit. A user tries to execute a script located in /data/script.sh but gets 'Permission denied'. The script has execute permissions. What is the most likely cause?

Refer to the exhibit. An administrator runs xfs_growfs on /dev/sdc1. What is the most likely reason the command succeeded without prior partition resizing?

An administrator writes a script to check disk usage and send an alert if usage exceeds 80%. The script uses 'df -h /' and parses the output. To maintain portability and avoid common pitfalls, which approach is recommended?

During boot, a server fails to mount an NFS filesystem listed in /etc/fstab. Which troubleshooting step should be taken first to isolate the issue?

An administrator needs to measure the execution time of the command 'backup.sh'. Which command prefix should be used?

Refer to the exhibit. An administrator wants to create an LVM logical volume using /dev/sdb3. What is the first step to complete this task?

A system administrator needs to find all regular files larger than 10MB in /var/log. Which find command should they use?

An administrator is migrating user accounts to a new system. They want to preserve the user's primary group name and GID. Which commands should be used in sequence?

Which TWO commands are needed to set up a swap partition on /dev/sdd1 for immediate use?

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 administrator is managing a Red Hat Enterprise Linux 9 server that uses LVM for storage. The volume group 'vgdata' contains two 500 GB physical volumes (sdb and sdc) with a logical volume 'lvdata' of 800 GB formatted with XFS and mounted at /data. The administrator adds a new 200 GB disk /dev/sdd and intends to use all of its capacity to extend lvdata. The following commands are executed in order: pvcreate /dev/sdd, vgextend vgdata /dev/sdd, lvextend -l +100%FREE /dev/vgdata/lvdata. The lvextend command completes successfully, but running 'df -h /data' still shows 800 GB. What is the most likely reason?

Which THREE commands can be used to monitor real-time process status and update the display every 2 seconds? (Choose three.)

A system administrator needs to ensure a service called 'myapp' starts automatically at boot and also start it immediately without affecting the current boot configuration. Which TWO commands should be used?

A system administrator needs to change the primary group of an existing user to a group that already exists. Which command should be used?

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?

Refer to the exhibit. Why did the sshd service fail?

A new intern created a script to display the current user's home directory: #!/bin/bash echo "Home directory: $home" The script outputs 'Home directory: ' with nothing after the colon. What is the most likely cause?

Which TWO commands can be used to view the contents of a compressed file named 'data.log.gz' without decompressing it permanently? (Choose exactly two.)

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

An administrator needs to add a 2GB swap partition to an existing disk (/dev/sdc) that already has one partition. The administrator creates a second primary partition using fdisk and sets the type to Linux swap (82). Which command completes the setup to enable swap?

An administrator wants to create a symbolic link named 'link_to_hosts' in /tmp that points to /etc/hosts. Which command is correct?

An administrator wants to extend an XFS filesystem that resides on an LVM logical volume. The volume group has free physical extents. Which is the correct sequence?

Which TWO of the following are correct statements about exit codes in shell scripts?

Refer to the exhibit. Why does the 'bin' user have /sbin/nologin as its shell?

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 production server runs RHEL 8 with a software RAID 5 array (/dev/md0) composed of three disks: /dev/sda, /dev/sdb, /dev/sdc. The array is used to store database files. The server experiences a disk failure on /dev/sdc. The admin replaces /dev/sdc with an identical disk and wants to rebuild the array. He runs: mdadm /dev/md0 --add /dev/sdc. The command completes without error, but the array shows a degraded state after several hours. What should the admin do next?

A junior administrator is asked to create a new group named 'qa' with an explicit GID of 4500 on a Red Hat Enterprise Linux 8 server. After running the appropriate command, they verify the result with getent group qa and see 'qa:x:4500:'. Which command did the junior administrator most likely run?

An administrator needs to compress a directory 'data' into an archive named backup.tar.gz using gzip compression. Which command should they use?

Which THREE of the following are valid methods to schedule a recurring task in Red Hat Enterprise Linux 8? (Choose exactly three.)

An administrator is building a container image with a Containerfile. They want to ensure that a specific RUN command always executes without using the build cache. Which build option should they use?

A system administrator runs the command 'ls -l' and sees that a file has permissions '-rwxr-xr-x'. The administrator wants to remove execute permission for the group and others while keeping it for the owner. Which chmod command should be used?

A Red Hat Enterprise Linux server has been configured with a custom repository for offline updates. The administrator runs 'yum repolist' and the custom repository is not listed. Which command should be used to verify that the repository configuration file is valid and located in the correct directory?

A container running a database service needs to persist data across restarts. The administrator decides to use a named volume. Which command creates a named volume and mounts it correctly?

A database server experiences high disk I/O wait times. The administrator runs 'iostat -x 1' and sees that the avgqu-sz for /dev/sda is 25 and await is 200 ms. The disk is a single 7200 RPM SATA drive. Which action is most likely to improve performance?

A system administrator receives alerts that the /var/log partition is 100% full. The partition is on /dev/mapper/vg_log-lv_var_log, formatted with XFS, and is mounted at /var/log. The volume group vg_log has 10GB of free space available. The administrator runs the command `lvextend -L +10G /dev/mapper/vg_log-lv_var_log` successfully, but then `df -h` still shows 100% full. What is the next step the administrator should take to use the newly added space?

Which THREE file descriptors are always available for every Unix process?

A Red Hat Enterprise Linux 8 server is used as a file server. It has a 1 TB disk /dev/sdc formatted as XFS and mounted at /srv/files. The /etc/fstab entry uses the device name /dev/sdc. After a hardware replacement, the new disk is detected as /dev/sdd, and the server fails to boot because /srv/files cannot be mounted. The administrator used 'blkid' and found the new disk's filesystem UUID is 'abc-123'. What is the best course of action to ensure reliable mounting after future reboots?

A system administrator needs to ensure that a user named 'jdoe' can execute commands as root without being prompted for a password. Which configuration change should be made?

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?

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

A user named jdoe is receiving 'Permission denied' errors when trying to access a file owned by root with permissions 644. The user is a member of the root group. What is the most likely cause?

Which TWO commands can be used to display SELinux contexts of files? (Choose two.)

A system administrator wants to run a container as a systemd service that restarts automatically after a system reboot. Which approach follows Red Hat best practices?

A system administrator needs to create a point-in-time backup of a logical volume 'lv_home' that is currently mounted. Which LVM feature should be used?

A server has a requirement that all users in the 'finance' group must have a password aging policy that forces password change every 90 days. Which approach best achieves this for existing users?

Refer to the exhibit. A security analyst reviews the journal output for sshd.service. Which of the following best describes the observed pattern of events?

Match each file system type to its description.

Refer to the exhibit. An administrator needs to create a new logical volume named 'data' of size 3GB. Which command should be used?

Refer to the exhibit. After extending the logical volume, why does the df output still show 5.0G?

Match each command to its function in managing storage.

A storage administrator is asked to increase the size of an ext4 filesystem mounted at /data. The underlying logical volume /dev/mapper/vg01-lv01 is currently 10GB and the volume group has 5GB of free extents. After extending the logical volume by 2GB using lvextend -L +2G /dev/mapper/vg01-lv01, what command must be run to resize the filesystem?

Based on the exhibit, which device is used for swap?

Match each networking term to its definition.

A user reports they cannot log in to a Linux system. Their account was recently created. The administrator checks /etc/passwd and sees the entry: jsmith:x:1001:1001::/home/jsmith:/sbin/nologin. What is the likely issue?

After creating a new partition on /dev/sdc, the administrator runs 'partprobe' to inform the kernel of the change. What is the primary purpose of partprobe?

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

Which command creates an XFS filesystem on /dev/nvme0n1p1 and sets the label to 'data'?

Refer to the exhibit. What effect does the value INACTIVE=-1 have on newly created user accounts?

A filesystem is reported as 'read-only' after a system crash. The admin runs fsck and sees 'clean' status. What is the most likely reason it remains read-only?

A sysadmin writes a shell script /usr/local/bin/check_service.sh that must accept exactly two positional arguments: a service name and a threshold. The script begins with: #!/bin/bash if [ $# -ne 2 ]; then echo "Usage: $0 <service> <threshold>" exit 1 fi An operator runs the script as: ./check_service.sh httpd What is the exit status of the script, and what output is produced?

An administrator wants to add an additional swap partition of 2GB on device /dev/sdb1. Which set of commands should be used to enable swap and make it persistent across reboots?

Refer to the exhibit. A web server is serving content from /var/www/html. SELinux is in enforcing mode. The web client reports 'Forbidden'. What is the most likely cause?

Put the steps to configure NFS server to export /nfsshare to a specific client in order.

Which TWO commands can be used to list block devices and their attributes? (Choose exactly two.)

A system administrator is troubleshooting a cron job that runs a script as root. The script is located at /root/scripts/backup.sh and has permissions 755. The cron job is defined in /etc/crontab with the line: 0 2 * * * root /root/scripts/backup.sh. However, the script does not run at the scheduled time. The administrator checks the cron logs and finds no errors. The administrator then runs the script manually as root and it executes successfully. What is the most likely cause of the cron job not running?

A user is unable to delete a file named '-f' in the current directory. Which command will successfully remove it?

Refer to the exhibit. An administrator needs to create a 1.2 TiB logical volume named 'data' in volume group 'myvg' and mount it persistently at /data. Which sequence of commands should be used?

A company runs a web application on a Red Hat Enterprise Linux 8 server. The application is served by Apache HTTPD, and it requires read/write access to a custom directory /var/www/app_data. The SELinux context for the directory is set to httpd_sys_rw_content_t. Apache runs in enforcing mode. Recently, a new feature was added that requires Apache to connect to a database on the same server via a Unix socket. The database serves on /var/run/mysqld/mysqld.sock. After the feature deployment, the web application fails to connect to the database. The error logs show permission denied on the socket file. The socket file has permissions 660 and is owned by mysql:mysql. SELinux audit logs show AVC denials for httpd_t trying to connect to mysqld_var_run_t. Which of the following solutions should the administrator implement to allow Apache to read the database socket while maintaining security?

A system administrator needs to view the last 10 lines of the log file /var/log/messages in real time as new lines are added. Which command should be used?

A developer needs to compile software from source and install it under /opt/custom. To avoid affecting the system package manager, which approach should be used?

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

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 system has two logical volumes in the same volume group: 'lv_prod' (100% used) and 'lv_backup' (20% used). The administrator wants to allocate 5 GiB from 'lv_backup' to 'lv_prod' without unmounting any filesystems. Is this possible and why?

A new Linux administrator needs to read the manual page for the 'ls' command but also wants to search for the word 'color' within the manual. Which command accomplishes this?

A server has an LVM volume group 'vg_data' with a logical volume 'lv_data' formatted as ext4. The administrator needs to increase the filesystem size by 2 GB without unmounting. Which set of commands should be used?

Which command displays the UUID of a filesystem on /dev/sda1?

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

A system administrator writes the script shown. The /etc directory contains .conf files with spaces in their names (e.g., "my config.conf"). What is the most accurate description of the script's behavior?

Which TWO of the following are valid reasons to use LVM in a Red Hat Enterprise Linux environment?

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

A user jdoe, who is a member of the group staff, reports they cannot access the directory /shared. The administrator runs getfacl /shared and receives the output shown. Which of the following explains the issue?

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

A system administrator needs to find all files modified in the last 24 hours under /var/log. Which command accomplishes this?

After configuring sudo, a user reports: 'sudo: unable to open /etc/sudoers: Permission denied'. The admin checks the file permissions and sees '-rw-r-----' owned by root:root. What is the most likely cause?

A system administrator is trying to compress the contents of the directory /home/user/project into a tarball named project_backup.tar.gz using the command: tar -czf project_backup.tar.gz /home/user/project. The command completes without errors, but when the administrator tries to list the contents of the tarball using tar -tzf project_backup.tar.gz, it shows a leading slash (/) in the paths, like /home/user/project/file1. The administrator wants to create the tarball with relative paths instead. What change should be made to the tar command?

Which TWO commands can be used to create a filesystem on a new partition? (Choose two.)

Refer to the exhibit. An administrator tries to mount the partition /dev/sdc1 and gets a superblock error. What is the most likely cause?

An administrator receives an alert that a process named 'apache2' is consuming excessive CPU. The administrator needs to identify the PID of the process and then change its priority to the lowest possible value (least favorable scheduling). Which sequence of commands should be used?

Based on the exhibit, what is the most likely cause of the failure?

A web server is running in enforcing mode with SELinux, but Apache cannot read content in a custom directory /web. The directory has been labeled correctly with httpd_sys_content_t. However, access is still denied. What is the most likely cause?

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?

Match each user/group management command to its function.

An administrator accidentally deleted the group 'sales' which is the primary group of several users. What is the immediate effect on those users?

A system administrator is configuring a new RHEL 9 server with two 500GB SSDs. The requirement: create a 200GB XFS filesystem for /srv/data that is resilient to disk failure. The admin decides to create a RAID 1 (mirror) using mdadm with partitions on each disk: /dev/sda1 and /dev/sdb1, each 200GB. He creates the partitions with fdisk, then runs: mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1. The array is created and synced. He then creates a physical volume, volume group, and logical volume on top of /dev/md0, formats with XFS, and mounts. Later, a disk fails. After replacing the failed disk, he recreates the partition with identical size and runs: mdadm /dev/md0 --add /dev/sdb1. The command fails with 'Device /dev/sdb1 is busy'. What is the most likely cause?

Which file contains the list of filesystems to be mounted at system startup?

A server has a software RAID 5 array /dev/md0. One of its disks fails. The administrator wants to replace it without rebooting. Which command should be used to mark the disk as failed?

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?

Which file contains the hashed passwords for local user accounts?

A user needs to view the last 15 lines of a log file that is constantly being updated. Which command should they use?

A critical service must restart automatically after a crash. Which systemd directive should be added to the [Service] section of the service unit file?

A user reports that the Apache web server cannot serve the file /var/www/html/index.html on a RHEL 9 system when SELinux is in enforcing mode. Given the exhibit output, what is the most likely cause?

Which TWO commands can be used to check the UUID of a filesystem on /dev/sda1?

Refer to the exhibit. An administrator runs lsblk and sees the above output. The administrator wants to mount /dev/sdb1 at /mnt/data. What should be done first?

A user executes the script shown in the exhibit with './export_script.sh' and then runs 'echo $MY_VAR' in the same terminal. The output is empty. Why does this happen?

A system administrator runs 'mount -a' and receives an error: 'mount: /mnt/nfs: mount point does not exist'. The /etc/fstab entry is: server:/export /mnt/nfs nfs defaults 0 0. What is the most likely cause?

A system administrator has created a new group named 'ops'. The administrator wants to add the existing user 'alice' to this group as a supplementary group without affecting her current group memberships. Which command should be used?

An administrator is configuring a new filesystem for a database server that requires high performance and reliability. Which two features should be considered when choosing between ext4 and XFS? (Choose two.)

Which of the following is true regarding shrinking logical volumes?

A system administrator wants to allow user 'jdoe' to execute any command as root via sudo without being prompted for a password, but only from the host 'client1.example.com'. Which sudoers rule achieves this?

Which two commands can be used to create a new partition on a disk without erasing existing partitions? (Choose two.)

A technician runs 'mkfs.xfs /dev/sdb1' and later mounts it. The file system is reported as having a block size of 1024 bytes. What is the most likely reason?

Which THREE commands are used to manage SELinux file security contexts? (Select exactly three.)

Which THREE of the following are common practices to improve the reliability of shell scripts?

A system administrator needs to create a file system on a new 10GB partition /dev/sdb1 for use with a database that requires high reliability and supports snapshots. Which file system type should be chosen?

Which TWO commands can be used to create a new directory that will serve as a mount point?

Which THREE statements about container storage in podman are correct? (Choose THREE.)

Which TWO commands can be used to add a user to an existing supplementary group without removing them from other groups?

The administrator wants to mount a new filesystem on /dev/sdb1 with the label 'backup' and mount it at /mnt/backup. Which commands achieve this?

An administrator wants to add the two 2G disks (sdc and sdd) as physical volumes, extend the 'data' logical volume in volume group 'vg' by 2G, and grow the filesystem. Which sequence of commands should be used?

A script contains: lines=$(wc -l /etc/passwd); echo $((lines+1)). The output is unexpected. What is the problem?

Which TWO commands can be used to view recent systemd journal logs for the current 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?

You maintain a script that performs a long-running task and must clean up temporary files if the script is interrupted. The script uses: #!/bin/bash tempfile=$(mktemp) trap "rm -f $tempfile" EXIT # long task sleep 100 You notice that if the script receives SIGINT (Ctrl+C), the temporary file is not removed. Investigation shows that the trap on EXIT is not executed on SIGINT. Which modification should be made?

A security policy requires that all files in /home have the default SELinux context for user home directories. Which command recursively restores the default context?

An administrator needs to add a new 20GB disk /dev/sdb to a RHEL 9 server and mount it permanently at /data. The disk is unpartitioned. Which sequence of commands correctly accomplishes this?

During boot, a custom application fails because the /data file system is not mounted. Upon investigation, the administrator sees an error 'UUID=abc123 not found' in the logs. Which command should the administrator use to correct the /etc/fstab entry?

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

An administrator needs to list the permissions, owner, group, and filenames of all files in /var/log, including hidden files, in a human-readable format. Which command does this?

A server's firewall is managed by firewalld. The admin adds a rule to allow HTTPS traffic to the public zone, but clients still cannot connect. 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?

An administrator has an XFS filesystem on a logical volume /dev/vg_data/lv_data mounted at /data. To extend the filesystem by 10GB, which sequence of commands is correct?

A Red Hat Enterprise Linux 9 system enforces a security policy that user accounts must be disabled after 90 days of inactivity. The system administrator has configured /etc/shadow accordingly with the proper fields. User 'bob' has been on leave for 95 days. When bob returns and tries to log in, he is unable to do so. The administrator checks the shadow file and sees that bob's password expiration date has passed and the account is locked due to inactivity (the inactivity period has exceeded). The administrator wants to immediately reactivate bob's account without changing the password, and also wants to set the account to expire in 30 days from now (relative to the current date). Which set of commands should the administrator run to achieve this goal?

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?

Based on the exhibit, which statement about the container 'webserver' is true?

A user wants to display the contents of a file in reverse line order. 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?

Which systemctl command configures a service to start automatically at boot without starting it now?

Based on the exhibit, which mount point is mounted with the 'noexec' option?

Which shell built-in can be used to read user input during script execution?

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?

Which THREE of the following practices are recommended when creating simple shell scripts in a Red Hat Enterprise Linux environment to ensure reliability, security, and maintainability?

You are managing a Red Hat Enterprise Linux 8 server that hosts backup scripts. A user named 'backup' (UID 1005) is a member of the 'backup' group. The directory /var/backups is owned by root:backup with permissions 775. The 'backup' user needs to create files in this directory. However, when the user attempts to create a file, they receive 'Permission denied'. You verify that 'backup' is indeed listed in the backup group in /etc/group. The user's current shell was started after their last login. Which of the following is the most likely cause and solution?

An administrator needs to schedule a script to run every Monday, Wednesday, and Friday at 2:30 PM. Which cron expression should be used?

An administrator wants to display a list of all currently logged-in users. Which command is most appropriate?

Refer to the exhibit. If the system administrator wants to create a new logical volume of size 2GB in the 'rhel' volume group, what is the first command that must be executed?

A volume group vg_data has no free extents. An admin adds a new disk /dev/sdc and wants to extend the logical volume lv_data (ext4 filesystem) by 5GB. Which sequence of commands is correct?

A system administrator needs to replace all occurrences of 'enabled' with 'disabled' in /etc/ssh/sshd_config, but only on lines that do not start with '#'. Which sed command accomplishes this?

Refer to the exhibit. After mounting /dev/sdb1 with the noexec option, a script located at /mnt/data/test.file cannot be executed. What change will allow execution while maintaining security?

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

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 server running Red Hat Enterprise Linux 9 experiences high system load (load average 15 on a 4-core system) and slow response times. The administrator runs 'top' and sees that the 'kworker' processes are consuming significant CPU time. Further investigation reveals that the system is performing heavy I/O operations on the root filesystem, which is formatted as XFS. The administrator wants to reduce the impact of filesystem maintenance tasks on system performance. Which of the following actions should the administrator take?

A system administrator needs to create a file system on /dev/sdb1 with a size of 10 GB and mount it persistently at /data. The file system should support extended attributes and be suitable for large files. Which command sequence achieves this?

A developer wants to create a script that accepts a directory path as an argument and creates a timestamped backup of that directory. If no argument is provided, it should back up the current directory. How should the script handle the argument?

An administrator wants to mount an existing ext4 filesystem from /dev/sdb1 to /mnt/data at boot time. What entry should be added to /etc/fstab?

A system administrator needs to ensure that a user named 'bob' can access a shared directory '/data' owned by group 'developers'. The directory has permissions 2775 and is owned by root:developers. Bob is a member of the 'developers' group. However, when Bob tries to create a file in '/data', it fails with 'Permission denied'. What is the most likely cause?

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

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?

Which THREE of the following are valid and recommended practices when writing shell scripts for RHEL?

Alice tries to run 'sudo less /var/log/messages' and gets 'Sorry, user alice is not allowed to execute /usr/bin/less /var/log/messages as root on this host.' Why?

A system administrator notices that a server is responding slowly. The administrator runs `top` and sees a process named `backup_script` consuming 95% CPU. The process runs as root and is supposed to run nightly backups. However, the system load average is low. The administrator wants to investigate without killing the process. Which of the following is the best course of action?

Which of the following is the correct way to persistently mount a filesystem using its UUID?

Which THREE actions will create a new empty file named 'testfile' in the current directory? (Choose three.)

An administrator wants to ensure that any new user accounts created on the system have a default primary group matching the username. What change is needed?

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?

Which two commands can be used to view systemd journal entries for the sshd service?

Which TWO commands can be used to create a new user account in Red Hat Enterprise Linux 8?

A system administrator needs to run a container that remains running in the background and executes a web server. Which podman command will correctly run the container detached and map host port 8080 to container port 80?

A container exits immediately with status 1. The administrator runs 'podman logs container' but sees no output. What is the most likely reason for the missing logs?

Which TWO LVM commands can be used to reduce the size of a logical volume?

Which command initializes a disk partition as a physical volume for LVM?

An administrator wants newly created files to be readable and writable only by the owner, and readable by group and others. Which umask value should be set?

A script needs to execute a command that might fail, but the script should continue. The administrator wants to capture the exit status for logging. Which code snippet correctly implements this?

Which three network configuration methods are valid in RHEL 8/9?

Refer to the exhibit. An administrator wants to mount /dev/sdc1 on /mnt/storage. What must be done first?

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 system administrator needs to extend an existing logical volume 'lv_data' in volume group 'vg_data'. The administrator has already added a new physical volume /dev/sdd1 to the volume group. Which sequence of commands should be used to complete the extension and ensure the filesystem is usable?

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?

A container fails to start because the port it needs is already in use. Which command can the administrator use to identify the process using the port?

An administrator adds a new 100GB disk to a RHEL 9 server. Which command should be used first to verify that the kernel has detected the new disk?

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

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 helpdesk ticket states that user 'bob' cannot write to his own home directory. The directory /home/bob has permissions drwxr-xr-x and is owned by root:root. What command will fix this?

A company policy requires that when a user is deleted, all files owned by that user in /home should be reassigned to a 'guest' account. Which command accomplishes this?

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

A system administrator needs to create a shell script that processes a list of hostnames stored in a file, one per line, and runs a command on each host. Which loop construct is most appropriate?

A server has an LVM volume group vg01 with a physical volume /dev/sdb. The administrator wants to move all physical extents from /dev/sdb to /dev/sdd which is also in the same volume group. Which command sequence is correct?

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

You are a system administrator for a small company. The development team has created a shell script named 'deploy.sh' that automates deployment of a web application. The script is located at /home/devops/deploy.sh. The team reports that when they run the script with './deploy.sh' from the /home/devops directory, it fails with a 'Permission denied' error. However, running 'bash deploy.sh' works fine. Additionally, the script's first line is '#!/bin/bash' and the file permissions are '-rw-rw-r--'. The team wants to be able to run the script directly without typing 'bash'. Which of the following actions should you take to resolve the issue?

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

Which TWO commands can be used to add a user to a secondary group without removing existing supplementary group memberships? (Choose exactly 2)

Which three statements about firewalld zones are correct? (Choose three.)

Which TWO methods can be used to permanently set the system's hostname to 'server01.example.com'?

Refer to the exhibit. A system administrator wants to add an additional mount option 'noexec' to the /boot filesystem permanently. Which step is necessary before remounting?

Refer to the exhibit. A CGI script located at /var/www/cgi-bin/test.cgi fails to execute. What is the most likely cause?

A container named 'web1' was created and ran briefly before exiting with status 0. The administrator needs to restart it and attach to the running container's console. Which command should be used?

Match each log file to its typical content.

A system administrator needs to ensure that the user 'jdoe' can read files in the shared directory /project/data which is owned by group 'project'. The user 'jdoe' is currently not a member of the 'project' group. Which TWO steps should the administrator take to add 'jdoe' to the 'project' group? (Choose two.)

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 system administrator needs to create an XFS filesystem on /dev/sdb1 with the label 'data'. Which command should be used?

A system administrator needs to add a new 10GB disk to an existing volume group 'vgdata' to extend logical volumes. Which of the following is the correct sequence of commands?

An administrator wants to enable user disk quotas on an XFS filesystem mounted at /home. Which steps are required?

Refer to the exhibit. When the system boots, which filesystem will be mounted after the root filesystem?

A new employee named asmith needs a user account with a home directory and a specific UID of 1500. Which command accomplishes this?

A user complains that the 'ls' command no longer outputs colors. The administrator suspects a change in environment variables. Which command would help diagnose the issue?

An IT department runs a web server that stores user uploads on an ext4 filesystem on /dev/sdb1 mounted at /uploads. Recently, the partition has run out of space. The administrator checks with df -h and sees 100% usage. However, du -sh /uploads shows only 2GB used. The administrator suspects deleted files still held open by processes. Which command should be used to identify and resolve the issue?

The /data filesystem is at 99% capacity. The LVM setup shows that the volume group has 50GB free space, but the logical volume is only 100GB. What is the correct sequence of commands to increase the filesystem to use all available space in the volume group?

Which two are required to create a logical volume? (Choose two.)

Which command checks if a specific systemd service is currently running?

Refer to the exhibit. An administrator needs to create a new 5GB filesystem for /var/log. Which step is required?

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

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

An administrator needs to terminate a hung process with PID 3456 that does not respond to 'kill -15 3456'. Which signal should be used next?

An administrator notices that the /tmp directory is filling up quickly. They want to find all files in /tmp that are larger than 100 MB and owned by user 'ftp', then delete them. The administrator runs: find /tmp -type f -size 100M -user ftp -exec rm {} \;. However, this command deletes only files that are exactly 100 MB, not larger. Which find expression should be used instead?

Which THREE actions are required to enable a non-root user to run containers using Podman on Red Hat Enterprise Linux 8?

A company runs a critical web application in a container on a Red Hat Enterprise Linux 9 server. The container is started via a systemd service called 'webapp.service'. The service unit file was generated using 'podman generate systemd --new --name webapp'. Recently, after a kernel update and reboot, the service fails to start the container. The administrator runs 'systemctl status webapp.service' and sees 'Active: failed (Result: exit-code)' and 'Process: 1234 ExecStart=/usr/bin/podman run ... (code=exited, status=125)'. The administrator also checks 'journalctl -u webapp.service' and sees: 'Error: unable to start container: container create failed: OCI runtime error: container_linux.go:380: starting container process caused: exec: "/usr/bin/app.sh": stat /usr/bin/app.sh: no such file or directory'. The container image was built locally using a Containerfile that includes 'COPY app.sh /usr/bin/app.sh'. The administrator verifies the image is present locally. What should the administrator do to resolve this issue?

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?

During a security audit, an administrator needs to list all TCP ports on which the system is listening, showing only the port numbers and the associated process names. Which command best achieves this?

Which three commands can be used to display overall memory usage information?

A system administrator is setting up storage for a new application server. The application requires two separate filesystems: one for the database (needs to be at least 10GiB) and one for logs (needs at least 5GiB). The server has a single 20GiB disk /dev/sda. The administrator plans to use LVM and a single volume group 'vg_app'. They create physical volume on /dev/sda, create the volume group, and then create two logical volumes: 'lv_db' of 10GiB and 'lv_logs' of 5GiB. They format lv_db as ext4 and lv_logs as xfs, and mount them at /db and /logs respectively. After rebooting, the system fails to mount /logs. What is the most likely cause?

Which TWO statements about the /etc/shadow file are true? (Select exactly two.)

Arrange the steps to configure a logical volume snapshot named 'snap_lv_data' of logical volume 'lv_data'.

An administrator is configuring an NFS mount in /etc/fstab to mount from server:/export to /mnt/data. The mount must use the 'hard' and 'nosuid' options. Which line is correct?

Which TWO statements about systemd journal and rsyslog are correct?

Refer to the exhibit. The filesystem /var/www/html is mounted, but after a reboot, the directory is empty. What is the most likely cause?

Which TWO commands can be used to view the kernel ring buffer?

A complex script uses 'trap' to handle signals. The admin writes 'trap '' SIGINT' to ignore Ctrl+C, but later in the script they want to re-enable the default behavior. Which command restores the default behavior for SIGINT?

A junior admin receives a ticket: 'The /var partition is filling up quickly. The server has an extra 100GB disk /dev/sdb. The /var filesystem is on logical volume lv_var in volume group vg_system. Currently, vg_system has no free extents. The admin's plan: create a new physical volume on /dev/sdb, extend vg_system, extend lv_var, and resize the filesystem. He runs: pvcreate /dev/sdb; vgextend vg_system /dev/sdb; lvextend -L+100G /dev/vg_system/lv_var; resize2fs /dev/vg_system/lv_var. The system reports error: 'resize2fs: Invalid argument while trying to open /dev/vg_system/lv_var'. What is the most likely mistake?

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?

Which TWO commands can be used to view the contents of a compressed file named 'archive.tar.gz' without extracting it?

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 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?

An administrator wants to encrypt a new partition /dev/sdc1 using LUKS. Which command sequence is correct?

An administrator needs to enable swap on a newly created partition /dev/sdc1. Which two commands should be executed in order?

Which TWO commands can mount an ISO file /tmp/rhel.iso to /mnt/iso?

Order the steps to create a new LVM logical volume of 5 GiB named 'lv_data' in volume group 'vg_data'.

A developer runs the script shown in the exhibit and always sees 'Success' printed, even when the previous command fails. What is the most likely cause?

An ext4 filesystem on a logical volume has been extended with lvextend, but df -h still shows the old size. Which command must be run to make the filesystem aware of the new size?

A RHEL 8 system has an ext4 filesystem on /dev/sdb1 mounted at /backup. The admin runs out of space and wants to extend the filesystem. He adds a new disk /dev/sdc, creates a partition /dev/sdc1 (all space), adds it to LVM by creating a PV and extending the VG that contains the LV for /backup. He then extends the logical volume with lvextend -L+20G /dev/vg_backup/lv_backup. The command succeeds, but the filesystem still shows the old size. What did he forget to do?

Which THREE options are valid when creating a new partition with the 'parted' command? (Choose three.)

A junior admin needs to ensure that the 'apache' user (UID 48) cannot log in via SSH or console. Which command achieves this?

A technician is configuring a new Red Hat Enterprise Linux 9 server with multiple disks. They need to create a RAID 1 array using /dev/sda and /dev/sdb for the /boot partition. Which tool can create the RAID array and enable booting from it?

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

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

A developer is running Podman as a non-root user on a Red Hat Enterprise Linux 8 system. The developer successfully runs a container, but notices that after logging out of the SSH session, the container stops. The developer wants the container to continue running even after disconnecting from the SSH session. The container is a simple web server that listens on port 8080. The developer has already enabled lingering for the user account using 'loginctl enable-linger'. However, the container still stops upon logout. What additional step should the developer take to ensure the container persists after logout?

A system has a logical volume that is thinly provisioned. The thin pool has a size of 100GB and the thin volume has a virtual size of 500GB. The administrator notices that the thin pool has only 5GB of data written so far. Which command will display the current data usage of the thin volume?

An administrator wants to gracefully terminate a process with PID 12345. Which command should be used?

Which command can be used to create a logical volume using all available free space in a volume group?

A system administrator tries to mount a filesystem but receives the error: 'mount: /dev/sdb1 is already mounted or /data busy'. The filesystem is not listed in the mount output. What is the most likely cause?

Which TWO commands are valid for resizing an XFS file system? (Choose exactly two.)

A company needs to create a user account for a temporary contractor who will work for exactly 90 days. The account must be automatically disabled after 90 days. Which command should the administrator use?

A Red Hat Enterprise Linux 9 server has an LVM volume group 'vg01' that contains two physical volumes: /dev/sda2 and /dev/sdb1. After a reboot, the system fails to activate the volume group. The administrator runs 'pvdisplay' and sees one physical volume as 'unknown device'. What is the most likely cause?

A junior administrator is tasked with setting up SELinux contexts on a Red Hat Enterprise Linux 9 server to allow Apache HTTPD to read and write to a custom directory /var/www/customcontent. The directory already exists and contains several files. The administrator has confirmed that the httpd service is running and SELinux is in enforcing mode. After changing the context to httpd_sys_content_t using chcon, the web server can read files but cannot write to the directory. The administrator needs to fix this without disabling SELinux or changing the mode to permissive. Which of the following is the correct next step?

Which TWO of the following are required steps when migrating a logical volume from one physical volume to another in the same volume group?

After being added to a new supplementary group with usermod -aG, a user logs out and back in but still cannot access files owned by that group. Which command should the user run to verify current effective group membership?

To allow a user to run a specific program with root privileges without providing the root password, which configuration file should be modified?

The administrator attempts to run 'xfs_growfs /dev/vg00/lvol1' but receives an error. What is the most likely cause?

Which command creates a 2GB logical volume named 'lvdata' in the volume group 'vgdata'?

Which single command shows the UUID of a filesystem on /dev/sdb1?

After adding the last line to /etc/fstab, the system fails to boot with an error. What is the most likely cause?

Which TWO options to podman run can be used to persist data outside the container? (Select exactly two.)

Which two statements about SELinux modes are correct? (Choose two.)

You are the system administrator for a small company. A developer, Alice, needs to restart the web server (httpd.service) on server 'web1.example.com' without being prompted for a password. She should also be able to run any command as root on that server, but only from the server itself (not remotely). Currently, Alice can SSH into the server using her SSH key, but when she runs 'sudo systemctl restart httpd', she is prompted for her password. You have verified that Alice is in the 'wheel' group. The sudoers file currently has the line '%wheel ALL=(ALL) ALL'. You want to modify sudoers to satisfy the requirement with minimal privilege. Which action should you take?

Which TWO statements are true regarding container images and containers in Podman?

To mount an ext4 filesystem with the noatime option and remount read-only on errors, which file should be edited?

A containerized application writes logs to stdout. The administrator wants to view only the last 50 lines of logs from a container named 'app1'. Which command accomplishes this?

Which command displays the current working directory?

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?

A system has two 500GB disks in a RAID1 (mirror) using mdadm. One disk fails. After replacement, what is the correct procedure to restore redundancy?

Which command checks if a user's password has expired and forces a password change at next login?

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?

Refer to the exhibit. An administrator runs 'mount -o remount,ro /data' and then 'mount' shows /data as read-only. Later, the system is rebooted. What is the state of /data after reboot?

A system administrator needs to create a new ext4 filesystem on /dev/sdb1 and mount it persistently at /data. Which set of commands should be used?

An administrator wants to run a container with --user 1001:1001 to avoid running as root. After starting, the container cannot write to a bind-mounted directory owned by root. What is the best practice to allow write access?

Which TWO options correctly describe the use of 'podman exec'? (Choose TWO.)

Refer to the exhibit. An administrator attempts to mount all filesystems using 'mount -a' and receives an error. What is the most likely cause?

Match each systemd unit type to its purpose.

Which two commands can be used to display the contents of a compressed .tar.gz archive without extracting it? (Choose two)

Which THREE commands are required to create a logical volume named lv_data of size 10G in volume group vg_data, format it as XFS, and mount it at /mnt/data?

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?

The administrator wants to create a new ext4 file system on /dev/sdb1 with a block size of 1024 bytes. Which command should be used?

A logical volume 'lv_share' in volume group 'vg_share' has no free extents. The administrator needs to increase the size of '/dev/vg_share/lv_share' by 5 GB. There is another logical volume 'lv_archive' in the same volume group that has 10 GB free space within its filesystem. What must the administrator do to allocate space from 'lv_archive' to 'lv_share'?

An administrator needs to ensure that a container always runs with a specific SELinux context for security reasons. The container uses a volume mount from the host. Which command should be used to start the container?

A system administrator is troubleshooting a custom service called 'database.service' that fails intermittently. The service is a proprietary database that requires large amounts of memory. The administrator runs systemctl status database and sees 'Active: failed (Result: core-dump)' and the journal shows 'Out of memory: Killed process (database) total-vm:...' The server has 8GB RAM and 2 CPU cores. The service unit file does not contain any memory limits. The application is configured to use up to 4GB. The administrator suspects the systemd service is being killed by the OOM killer. Which action should the administrator take to prevent this issue?

Which TWO of the following are valid examples of using redirection and pipes in bash to append the output of a command to a file while also displaying it on the terminal? (Choose exactly two.)

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 system administrator needs to configure a firewall using firewalld to allow incoming HTTPS traffic and deny incoming SSH traffic from a specific source IP 192.168.1.100. Which two commands should be run? (Choose two.)

An administrator wants to ensure that a file system is automatically mounted at boot. Which file should be edited?

Refer to the exhibit. An administrator extends an XFS filesystem on /data. Which prerequisite step is missing from the output?

After adding a new disk /dev/sdc, a system administrator wants to mount it persistently at /mnt/backup. Which entry in /etc/fstab is most reliable?

Match each firewall zone to its default trust level.

A server uses firewalld with the default zone set to 'drop'. SSH is allowed only for the 192.168.1.0/24 subnet via a rich rule in the 'internal' zone. After a reboot, SSH connections from that subnet are refused. What is the most likely cause?

Which three of the following actions are required when adding a new swap device to the system? (Choose three.)

A system is experiencing high CPU usage. The administrator suspects a process is stuck in an infinite loop. Which command can be used to identify the most CPU-intensive process in real-time?

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?

An administrator wants to create a swap partition on /dev/sdb1. After creating the partition with fdisk, which command sets up the swap area?

A user was recently added to the 'testgrp' group using `usermod -aG testgrp user1`. However, when they try to access a file owned by testgrp with permissions 660, they get permission denied. What is the most likely reason?

A script needs to be run at system boot for a specific user. Which method ensures the script runs with that user's environment?

A script needs to read every line from a file and execute a command on each line. Which code block is correct and handles whitespace correctly?

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?

Which command shows the amount of disk space used and available on each mounted filesystem?

A storage administrator has added a new 10 GiB disk (/dev/vdb) to a Red Hat Enterprise Linux 9 server. The requirement is to create a single XFS filesystem on the entire disk and mount it persistently at /data. The administrator runs mkfs.xfs /dev/vdb and then adds the line '/dev/vdb /data xfs defaults 0 0' to /etc/fstab. After running mount -a, the mount succeeds and df -h shows the expected size. However, after a reboot the system drops into emergency mode and reports that /data cannot be mounted. The administrator verifies that the disk is still present and the filesystem is intact. Which of the following is the most likely cause of the failure?

A RHEL 9 server uses LVM with volume group vg_app on a single physical volume /dev/sdc. The logical volume lv_home, formatted as XFS and mounted at /home, is running out of space, but the volume group has no free extents and no additional disks can be added. A colleague notes that /dev/sdc is a 200 GB device, yet only 120 GB of it is currently allocated to vg_app. Which single command will make the remaining space available to grow lv_home?

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

Which TWO of the following are valid mount options for enabling quotas on an ext4 file system?

An administrator needs to mount the backup filesystem with the ‘exec’ option temporarily for a one-time script. Which command will remount the filesystem with exec without unmounting?

Refer to the exhibit. A container named 'db' is running on the host. An administrator runs `podman inspect db` and sees the above output snippet. What can be concluded about the container's network configuration?

A system administrator needs to verify that the filesystem on /dev/sdb1 is ext4 before adding it to /etc/fstab. Which command provides this information?

A user reports that they cannot use the 'systemctl' command to manage services. The user is part of the 'wheel' group. Which configuration change is required to allow this?

An administrator needs to pull a container image from a private registry at registry.example.com:5000. The registry requires authentication. Which command should be used first?

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

After restoring files from backup, an SELinux context of a directory is not correct. Which command will restore the file contexts to the system defaults?

Which THREE options to podman run can be used to publish container ports to the host? (Select exactly three.)

Refer to the exhibit. What is the primary security concern with this sudo configuration?

A file server is experiencing slow write performance. The admin suspects the filesystem is nearly full. Which command should be used to check disk usage per partition?

A system administrator is troubleshooting a container that fails to start with the error: 'Error: cannot start container: listen tcp4 :80: bind: address already in use'. The container is intended to serve HTTP traffic on port 80. What is the most appropriate first step to resolve this issue?

Refer to the exhibit. An administrator wants to add the HTTP service (port 80) to the internal zone permanently. Which sequence of commands should be used?

After a system crash, an administrator needs to review logs from the previous boot. Which command shows only logs from the boot before the current one?

An administrator needs to run a container with a bind mount of the host directory /data to /var/lib/data inside the container. The container image is web:latest. Which command correctly achieves this?

An administrator needs to monitor network traffic on a specific interface in real time. Which tool is most appropriate for this task?

Arrange the steps to configure a network bond (mode 1) using two interfaces (eth0, eth1) in RHEL.

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?

An administrator wants to modify the default expiration settings for new user passwords. Which file should be modified?

Which TWO commands can be used to create a physical volume for LVM? (Choose exactly two.)

A system administrator receives reports that a web server service (httpd) fails to start after a reboot. The administrator checks the service status and sees it is disabled. Which of the following is the most appropriate command to ensure the service starts automatically on future reboots?

Refer to the exhibit. What does the file permission -rw------- indicate about /etc/shadow?

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

A developer wrote a shell script that is intended to back up log files by copying all .log files from /var/log/myapp to /backup/logs. The script runs daily via cron but the backup folder is empty. The script contains the following line: `cp /var/log/myapp/*.log /backup/logs/`. What is the most likely reason the backup fails?

A backup script uses tar to create an archive, but the administrator wants to exclude the /tmp directory from the backup. Which tar option should be added?

Which TWO statements about Logical Volume Manager (LVM) metadata are correct?

A company policy requires that all new logical volumes be created with a physical extent size of 16 MiB to optimize performance for large sequential I/O. During the creation of a new volume group, what parameter should be used?

A server running RHEL 9 has an LVM logical volume /dev/vg00/lvol0 formatted with XFS, mounted at /data. The administrator needs to increase the file system size from 100GB to 150GB. Which command sequence should be used?

Refer to the exhibit. What is the most likely cause of the httpd service failure?

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?

Which command sets the password maximum age for user 'bob' to 30 days?

A user reports that a script in their home directory fails to execute. The script has permissions -rw-r--r-- and is owned by the user. Which command will allow execution for the owner?

Which THREE statements about /etc/shadow are true? (Choose exactly 3)

An administrator wants to ensure that when a user presses Ctrl+C during a long-running script, the script cleans up temporary files before exiting. Which approach should the script use?

Which TWO of the following are true about creating simple shell scripts in Red Hat Enterprise Linux?

The root filesystem is at 90% capacity. Which command increases available space without unmounting?

A user wants to set an environment variable named 'EDITOR' to the value '/usr/bin/vim' so that it is available in all future login sessions. Which file should the user add the export command to?

An administrator wants to add 20GB of additional space to the root filesystem. The volume group vg01 has no free extents. Which action should be taken first?

Put the steps to configure a new swap partition of 2 GiB on /dev/sdc1 and enable it in order.

To enforce that user passwords expire every 90 days and users are warned 7 days before expiration, which command sets these policies for user 'john'?

After adding a new disk to a volume group, which command is used to extend a logical volume by 2GB?

A system administrator has added a new disk /dev/sdb to a Red Hat Enterprise Linux 9 server. The directory /data already exists. Which two steps must be performed to prepare the disk for mounting as an XFS file system at /data?

A system administrator needs to ensure that the user 'jdoe' cannot log in via SSH but can still use other services like FTP. Which approach should the administrator take?

A developer needs to search for the string 'ERROR' in all files under /var/log, but wants to exclude files ending with '.gz'. Which command is correct?

Which three actions enhance security for user accounts on a Red Hat Enterprise Linux system? (Choose three.)

A junior administrator needs to create a new Ext4 file system on the device /dev/sdb1. Which command should be used?

A filesystem reports 0% free space in df -h, but when checking the directory size with du -sh, it shows much less usage. What is the most likely cause?

A database container crashes repeatedly. The administrator wants to see the last 10 lines of the container's logs before it exited. Which command should be used?

An administrator needs to add a 1GB swap partition on /dev/sdd1. Which series of commands accomplishes this?

Refer to the exhibit. After re-adding the disk, the recovery process shows 0% progress and remains at 0. What is the most likely cause?

A user wants to run a container that will restart automatically unless explicitly stopped by the administrator. Which podman run option should be used?

A server has been compromised, and the administrator suspects an unauthorized user account may have been created. Which file should be examined to list all local user accounts?

Which TWO commands can be used to display the contents of a compressed log file without decompressing it first?

Which command displays the UUID of all file systems on the system?

Refer to the exhibit. What is the most likely cause of this failure?

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?

Which file should be present in a directory to build a container image using 'podman build'?

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?

Based on the exhibit, how much free space is available in the volume group vg00?

An administrator runs 'getenforce' and sees 'Enforcing'. They then run 'setenforce 0' but SELinux still denies access to a custom application. What is the most likely reason?

A security policy requires user passwords to expire 60 days after last change. Which command sets this for user 'jdoe'?

Which THREE filesystem types are natively supported in RHEL 8/9 for local storage? (Choose exactly three.)

An administrator used the command useradd -D -f 10 to change the default inactivity period. What effect does this have on future user accounts?

A company policy requires that all cron jobs run by non-root users must be logged to a specific file /var/log/usercron.log. The system administrator decides to use rsyslog to capture these messages. Which configuration directive should be added to /etc/rsyslog.conf or a file in /etc/rsyslog.d/ to achieve this?

A system administrator needs to find all files in /var/log that have been modified in the last 2 hours. Which command should be used?

An administrator needs to compress a directory containing subdirectories and files into a single archive file, with maximum compression, and exclude all '*.tmp' files. Which command should be used?

The administrator wants to reduce the file system size to 40GB. Which command sequence should be used?

A containerized web server needs to persist logs outside the container. Which podman run option allows the administrator to specify a bind mount with mount propagation options?

Refer to the exhibit. The backup script runs every 5 minutes but generates errors. What is the most likely cause?

A Red Hat Enterprise Linux system has a second disk /dev/sdb with a single partition /dev/sdb1 that was formatted as XFS and mounted at /mnt/backup. The administrator wants to change the filesystem on /dev/sdb1 to ext4 without losing existing data. Which steps should be taken in order?

During a system audit, an administrator finds that a filesystem mounted at /srv/data with ext4 is not showing in /etc/fstab. Further investigation reveals that the underlying device is an LVM logical volume lv_data in vg_data. The administrator wants to ensure the filesystem is mounted at boot. He adds an entry to /etc/fstab using the device path /dev/vg_data/lv_data. On reboot, the system fails to mount the filesystem and enters emergency mode. The logical volume and filesystem are intact. What is the most likely reason for the failure?

Refer to the exhibit. An administrator attempts to mount the partition but receives an error. Which command should be run first to resolve the issue?

Which TWO methods are considered best practices for securing SSH access to a server? (Select exactly two.)

Refer to the exhibit. The /proc/mdstat output shows a RAID1 array with two devices. One of the disks (/dev/sda1) fails. Which sequence of commands would be used to remove the failed disk and add a new replacement disk /dev/sdc1?

An administrator wants to allow user 'alice' to SSH into the server using key-based authentication only. Which configuration change is required?

Which TWO commands can be used to view the current disk usage of a filesystem?

An administrator needs to create a new 500MB swap partition on a disk that already has an extended partition. The disk /dev/sda has partitions: /dev/sda1 (primary, /boot), /dev/sda2 (extended), /dev/sda5 (logical, swap, 2GB). The administrator wants to add another swap partition, but fdisk shows no free space. Which approach should be used?

Which three of the following are valid methods to view the manual page for the 'ls' command? (Choose three)

Consider the script in the exhibit. The script is run in a directory containing 'a.txt' and 'b.txt' but also has a subdirectory 'backup' with .txt files. What will be the output?

An administrator wants to add the user 'jane' to the supplementary groups 'wheel' and 'docker' without removing her from other groups. Which command should be used?

A junior administrator configured a new network interface (ens224) with a static IP address using a configuration file in /etc/sysconfig/network-scripts/ifcfg-ens224. After restarting the network service, the interface comes up but does not get the IP address. The administrator runs 'ip addr show ens224' and sees no IP address assigned. The interface is listed as DOWN. The administrator then runs 'ifup ens224' manually, which succeeds, and the IP address appears. What is the most likely cause?

A company requires that SSH access from the external network (10.0.1.0/24) only be allowed to port 2222, and all other incoming traffic on the firewall should be dropped. Which firewalld rule should be applied to the external zone?

An organization uses a shell script that runs daily via cron on a central management server to archive logs from 50 remote Red Hat Enterprise Linux servers. The script uses `scp` with SSH key-based authentication (passwordless) to transfer files. Recently, after a security team rotated the SSH host keys on all remote servers, the script started failing with 'Host key verification failed' errors. The administrator needs to restore automated log transfers without compromising security. The remote servers are in a controlled internal network, and the management server's `~/.ssh/known_hosts` file is not centrally managed. Which course of action should the administrator take?

Refer to the exhibit. The script produces the error shown. What is the most likely cause?

A container needs to share the host's network namespace for performance monitoring. Which podman run option achieves this?

A logical volume /dev/vg_data/lv_data formatted as XFS is full. The administrator extends the LV by 1 GB using 'lvextend -L +1G /dev/vg_data/lv_data'. Which additional command is required to use the new space?