EX200 Deploy, configure, and maintain systems — Timed 10 Questions

Question 1

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?

Accepted Answer

192.168.1.10:/export/data /mnt/data nfs4 defaults 0 0. The /etc/fstab entry for an NFS mount requires the remote server and export path in the format server:/export, followed by the local mount point, the filesystem type (nfs4 for NFSv4), mount options, dump flag, and fsck order. This matches the standard NFS fstab syntax for automatic mounting at boot.

Answer

192.168.1.10 /export/data /mnt/data nfs4 defaults 0 0

Answer

/mnt/data 192.168.1.10:/export/data nfs4 defaults 0 0

Answer

192.168.1.10:/export/data /mnt/data nfs defaults 0 0

Question 2

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

Accepted Answer

'systemctl list-units --type=service' lists all service units.. 'systemctl list-units --type=service' filters the output to show only service units, which are the primary unit type for managing daemons and background processes. Option C is correct because 'systemctl status' displays the current state of a unit, including whether it is active (running), inactive (stopped), or in another state like failed.

Answer

'systemctl enable' starts the service immediately.

Answer

'systemctl mask' disables a service but allows manual start.

Answer

'systemctl disable' stops the service immediately.

Question 3

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?

Accepted Answer

The script /usr/local/bin/example.sh exits immediately.. The service unit is configured as `Type=oneshot`, which is designed to run a task that exits after completion. When the script `/usr/local/bin/example.sh` exits immediately (as described in answer choice A), systemd correctly reports the service state as `active (exited)`. The `systemctl start` command produces no output because it successfully executed the script. This is the expected behavior for a oneshot service, not an error.

Answer

The Restart=on-failure directive is misconfigured.

Answer

The network.target dependency is not met.

Answer

The administrator forgot to run systemctl daemon-reload after starting.

Question 4

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?

Accepted Answer

Use fdisk to delete and recreate /dev/sdb1 with larger size, run partprobe, then xfs_growfs /mnt/data.. The filesystem on /mnt/data is XFS (as shown in the exhibit), and XFS cannot be shrunk; it can only be grown. Since there is no unpartitioned space on /dev/sdb, the partition itself must be resized. The correct procedure is to delete and recreate the partition with a larger size using fdisk, inform the kernel of the change with partprobe, and then grow the XFS filesystem with xfs_growfs /mnt/data.

Answer

Use resize2fs /dev/sdb1 to expand filesystem.

Answer

Add a new disk, create a physical volume, extend volume group, and extend logical volume.

Answer

Use fdisk to delete and recreate /dev/sdb1 with larger size, then mount.

Question 5

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?

Accepted Answer

du -sch /data/*. The intended answer D is correct because du -sh /data/* lists per-item sizes. However, option A (du -sch /data/*) also lists per-item sizes (and adds a grand total), so it also helps identify the largest files. The original explanation incorrectly implies A is wrong without justification. The question should be revised to avoid ambiguity, e.g., by changing A to 'du -sh /data' or asking for the command that provides per-item sizes without a total.

Answer

du -sh /data

Answer

du -h --max-depth=1 /data

Question 6

Match each SELinux mode to its behavior.

Accepted Answer

Enforcing: SELinux security policy is enforced.. SELinux has three modes: Enforcing (policy enforced, violations blocked), Permissive (policy not enforced, only warnings logged), and Disabled (SELinux turned off). Common confusions involve swapping behaviors between modes.

Answer

Enforcing: SELinux logs all actions but does not block them.

Answer

Permissive: SELinux enforces the policy and blocks violations.

Answer

Disabled: SELinux warns but does not block.

Question 7

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?

Accepted Answer

sec=krb5i,soft. All Kerberos-based sec options (krb5, krb5i, krb5p) require valid Kerberos tickets and thus prevent unauthorized access even with no_root_squash. sec=sys does not use Kerberos. The hard/soft and noexec options are unrelated to authentication. To make D the only correct answer, the question should ask for full encryption/confidentiality, not just authentication.

Answer

sec=sys,ro

Question 8

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?

Accepted Answer

fallocate -l 2G /swapfile; mkswap /swapfile; swapon /swapfile. Both options A and C correctly create a 2GB swap file and activate it. Option A uses `fallocate` which pre-allocates space efficiently without writing zeros, while option C uses `dd` to explicitly write zeros, which is also a valid method. The question does not specify efficiency as a criterion, so both are acceptable.

Answer

mkfile 2G /swapfile; mkswap /swapfile; swapon /swapfile

Answer

touch /swapfile; truncate -s 2G /swapfile; mkswap /swapfile; swapon /swapfile

Question 9

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

Accepted Answer

df -h. The `df -h` command displays disk space usage for mounted filesystems, with the `-h` flag converting sizes into human-readable units (e.g., KB, MB, GB). This directly meets the requirement of showing available disk space on mounted filesystems in a human-readable format. The `du -sh` command shows the total disk usage of a specific directory or file, not available space on filesystems, so it does not satisfy the question's requirement.

Answer

blkid

Answer

ls -lh

Answer

du -sh

Answer

fdisk -l

Question 10

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

Accepted Answer

The fourth entry (/mnt). The /mnt entry in /etc/fstab is configured with the default mount options, which include the _netdev option being absent. Without _netdev, the system will attempt to mount the NFS filesystem during the boot process before the network is fully operational. If the NFS server is unavailable, the mount will fail, and because the default mount behavior for non-root filesystems in /etc/fstab is to cause a boot failure if the mount fails (unless the 'nofail' option is specified), the system will drop into emergency mode and fail to complete the boot process.

Answer

The third entry (/home)

Answer

The second entry (/boot)

Answer

The first entry (/)