LFCS Drag & Drop — 10 Questions

Question 1

Order the steps to mount an ext4 filesystem from an external USB drive automatically at boot.

Accepted Answer

Identify the UUID using blkid, create the mount point directory, add an entry to /etc/fstab using the UUID with options defaults and dump/pass values, then run mount -a to test.. Using UUID in fstab ensures persistent mounting; testing with mount -a verifies no errors.

Answer

Plug in the USB drive, create the mount point, add an entry to /etc/fstab using the device name (e.g., /dev/sdb1), then reboot without testing.

Answer

Run mount -a first, then edit /etc/fstab to add the entry using UUID, and finally create the mount point.

Answer

Add an entry to /etc/fstab using the device name, manually mount with mount command, then create the mount point after mounting.

Question 2

Order the steps to set up a LVM logical volume from a new disk.

Accepted Answer

Create physical volume (pvcreate), then volume group (vgcreate), then logical volume (lvcreate), then format with filesystem (mkfs), then mount.. The correct sequence for setting up an LVM logical volume from a new disk is: first create a physical volume (PV) using pvcreate, then create a volume group (VG) with vgcreate, then create a logical volume (LV) with lvcreate, then format the LV with a filesystem using mkfs, and finally mount it to a directory. This order ensures all dependencies are satisfied: the VG requires the PV, the LV requires the VG, and the filesystem requires the LV.

Answer

Create volume group (vgcreate), then physical volume (pvcreate), then logical volume (lvcreate), then format, then mount.

Answer

Create physical volume (pvcreate), then format (mkfs), then volume group (vgcreate), then logical volume (lvcreate), then mount.

Answer

Create logical volume (lvcreate), then physical volume (pvcreate), then volume group (vgcreate), then format, then mount.

Question 3

Order the steps to recover a forgotten root password on a Linux system using single-user mode.

Accepted Answer

1. Boot into single-user mode, 2. Remount filesystem as read-write, 3. Change root password, 4. Reboot.. To recover a forgotten root password on Linux using single-user mode, you must first boot into single-user mode (e.g., by adding 'single' to the kernel command line). At the root prompt, the filesystem is mounted read-only, so you must remount it as read-write with 'mount -o remount,rw /'. Then use 'passwd root' to set a new password. Finally, reboot the system. Attempting to change the password without remounting or rebooting prematurely will cause the recovery to fail.

Answer

1. Boot into single-user mode, 2. Change root password, 3. Remount filesystem as read-write, 4. Reboot.

Answer

1. Boot into single-user mode, 2. Remount filesystem as read-write, 3. Reboot, 4. Change root password.

Answer

1. Change root password, 2. Boot into single-user mode, 3. Remount filesystem as read-write, 4. Reboot.

Question 4

Order the steps to create a systemd service unit that runs a script at boot.

Accepted Answer

Create the unit file, then enable the service for boot, then start the service, then check the status.. Creating the unit file, enabling for boot, starting, and checking status are standard steps.

Answer

Start the service, then create the unit file, then enable for boot, then check status.

Answer

Enable the service for boot, then create the unit file, then start, then check status.

Answer

Create the unit file, then start the service, then enable for boot, then check status.

Question 5

Arrange the steps to configure a new user account with sudo privileges on a Linux system.

Accepted Answer

Step 1: Create the user account with useradd. Step 2: Set a password with passwd. Step 3: Add the user to the sudo group (e.g., wheel) with usermod -aG. Step 4: Verify sudo access by running a command like 'sudo -l' or 'sudo whoami'.. After creating the user and setting a password, adding to the wheel group grants sudo access. Verification and testing confirm it works.

Answer

Step 1: Create the user account. Step 2: Set a password. Step 3: Test sudo access. Step 4: Add the user to the sudo group.

Answer

Step 1: Create the user account. Step 2: Add the user to the sudo group. Step 3: Test sudo access. Step 4: Set a password.

Answer

Step 1: Add the user to the sudo group. Step 2: Create the user account. Step 3: Set a password. Step 4: Test sudo access.

Question 6

Order the steps to troubleshoot a DNS resolution issue from a Linux client.

Accepted Answer

Check DNS configuration, then test DNS resolution, then check network connectivity, then check firewall settings. The correct sequence for troubleshooting DNS resolution from a Linux client starts with verifying the local DNS configuration (e.g., /etc/resolv.conf), then testing resolution using tools like nslookup or dig. Next, check network connectivity to the DNS server (ping), and finally examine firewall rules that might block UDP/TCP port 53. This logical progression isolates the problem systematically, avoiding wasted effort on unrelated checks.

Answer

Check firewall settings, then check network connectivity, then test DNS resolution, then check DNS configuration

Answer

Test DNS resolution, then check DNS configuration, then check firewall settings, then check network connectivity

Answer

Check network connectivity, then check DNS configuration, then test DNS resolution, then check firewall settings

Question 7

Order the steps to configure a cron job that runs a script every day at 2 AM.

Accepted Answer

Step 1: Run 'crontab -e' to open the crontab editor.
Step 2: Add the line '0 2 * * * /path/to/script'.
Step 3: Save and exit the editor.
Step 4: Run 'crontab -l' to verify the job is scheduled.. The correct order to configure a cron job is: open the crontab file with 'crontab -e', add the cron expression with the correct time fields (minute, hour, day, month, weekday) and the script path, save the file, and then verify with 'crontab -l'. Common mistakes include adding the line before opening the editor, saving before adding, or verifying before editing.

Answer

Step 1: Add the line '0 2 * * * /path/to/script' directly to the crontab.
Step 2: Run 'crontab -e' to open the editor.
Step 3: Save and exit the editor.
Step 4: Run 'crontab -l' to verify.

Answer

Step 1: Run 'crontab -e' to open the editor.
Step 2: Save and exit the editor immediately.
Step 3: Add the line '0 2 * * * /path/to/script'.
Step 4: Run 'crontab -l' to verify.

Answer

Step 1: Run 'crontab -l' to verify existing jobs.
Step 2: Run 'crontab -e' to open the editor.
Step 3: Add the line '0 2 * * * /path/to/script'.
Step 4: Save and exit.

Question 8

Order the steps to set up passwordless SSH key-based authentication.

Accepted Answer

Generate SSH key pair using ssh-keygen, then copy the public key to the remote server using ssh-copy-id, then set correct permissions on the remote server (chmod 700 ~/.ssh and chmod 600 ~/.ssh/authorized_keys), then test the SSH login without a password prompt.. Key generation, copying, and testing are essential; permissions and file verification ensure security.

Answer

Copy the public key to the remote server using ssh-copy-id first, then generate the SSH key pair, then set permissions, then test login.

Answer

Generate SSH key pair, then set permissions on the remote server, then test login, then copy the public key.

Answer

Generate SSH key pair, then set permissions on the local machine, then copy the public key to the remote server, then test login.

Question 9

Order the steps to create a new partition on a disk using fdisk.

Accepted Answer

Run 'n' to create a new partition, then specify partition type/number, then specify starting and ending sectors, then run 'w' to write changes.. The correct sequence to create a partition with fdisk is: first use 'n' to create a new partition, then specify the partition type and number (e.g., primary, logical) when prompted, then define the starting and ending sectors, and finally use 'w' to write the changes to the disk. Skipping or reordering steps can lead to errors or unintended configurations.

Answer

Run 'n' to create a new partition, then run 'w' to write changes, then specify partition type/number and sectors.

Answer

First specify partition type/number, then run 'n' to create a new partition, then specify sectors, then run 'w'.

Answer

Run 'n' to create a new partition, then specify sectors, then specify partition type/number, then run 'w'.

Question 10

Order the steps to configure a static IP address on a CentOS/RHEL 7 system using ifcfg files.

Accepted Answer

Edit the ifcfg file, then restart the network service, then verify the configuration.. Static IP configuration requires editing the ifcfg file, restarting network, and verification.

Answer

Restart the network service, then edit the ifcfg file, then verify the configuration.

Answer

Edit the ifcfg file, then verify the configuration, then restart the network service.

Answer

Verify the configuration, then edit the ifcfg file, then restart the network service.