XK0-006 System Management Practice Test 8 — 15 Questions

Question 1

A system administrator is configuring a new disk partition for a database server. The disk has been partitioned as /dev/sdb1. Which three steps are necessary to make the filesystem available for use? (Choose three.)

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Mount the partition with mount. To use a new partition, you must create a filesystem (mkfs), mount it (mount), and add an entry to /etc/fstab for persistent mounting.

Answer

Run fsck to check the filesystem

Answer

Set a label with e2label

Question 2

Which command would a Linux administrator use to locate all files in the /var/log directory that have been modified within the last 7 days?

Accepted Answer

find /var/log -mtime -7. The find command with -mtime -7 finds files modified less than 7 days ago. The other options are either incorrect or not suitable for this task.

Answer

ls -lt /var/log | head -n 7

Answer

grep -mtime -7 /var/log

Answer

locate -mtime -7 /var/log

Question 3

A Linux administrator wants to change the permissions of a file to allow the owner to read, write, and execute; the group to read and execute; and others to read only. Which chmod command should be used?

Accepted Answer

chmod 754 file. Octal 754 corresponds to rwxr-xr--: owner rwx (7), group r-x (5), others r-- (4).

Answer

chmod 764 file

Answer

chmod 744 file

Answer

chmod 755 file

Question 4

Which command displays the current umask value in symbolic mode?

Accepted Answer

umask -S. umask -S displays the umask in symbolic (rwx) format. The plain umask shows octal.

Answer

umask

Answer

umask --symbolic

Answer

umask -s

Question 5

A system administrator needs to find all files in the /etc directory that are larger than 1 MB and are regular files. Which find command accomplishes this?

Accepted Answer

find /etc -type f -size +1M. Only option A correctly accomplishes the task. Option A uses -type f to select regular files and -size +1M to find files larger than 1 MB. Option B fails because the size suffix 'MB' is invalid; it should be 'M'. Option C omits the '+' prefix, so it matches files exactly 1 MB, not larger. Option D is incorrect; it uses -type d, which selects directories, not regular files. Option E also uses -type d, and the order of predicates does not affect the output, but the type is wrong.

Answer

find /etc -size +1MB -type f

Answer

find /etc -type f -size 1M

Answer

find /etc -type d -size +1M

Answer

find /etc -size +1M -type f

Question 6

An administrator wants to display the last 20 lines of a log file and also write those lines to a file called recent.log. Which command should be used?

Accepted Answer

tail -n 20 file | tee recent.log. tail -n 20 file | tee recent.log displays the last 20 lines and writes them to recent.log. tee is used to split output to file and stdout.

Answer

tail -n 20 file > recent.log

Answer

head -n 20 file > recent.log

Answer

cat file | head -n 20 > recent.log

Question 7

A developer wants to change all occurrences of 'foo' to 'bar' in a configuration file and save the changes in-place. Which sed command should be used?

Accepted Answer

sed -i 's/foo/bar/g' file. sed -i 's/foo/bar/g' file performs an in-place global substitution. The -i flag edits the file directly.

Answer

sed -i 's/foo/bar/' file

Answer

sed -n 's/foo/bar/p' file

Answer

sed 's/foo/bar/g' file

Question 8

A system administrator notices that a process with PID 1234 is consuming excessive CPU. The administrator wants to terminate this process gracefully. Which command should be used?

Accepted Answer

kill 1234. kill sends a signal; by default it sends SIGTERM (15), which asks the process to terminate gracefully. SIGKILL (9) is forceful.

Answer

killall 1234

Answer

pkill -9 1234

Answer

kill -9 1234

Question 9

An administrator wants to start a long-running script in the background so that it continues running even after logging out. Which command should be used?

Accepted Answer

nohup script.sh &. nohup prevents the process from receiving SIGHUP when the terminal closes. & runs it in background.

Answer

script.sh &

Answer

nohup script.sh

Answer

bg script.sh

Question 10

A Linux server is booting but stops at a prompt with the message 'Give root password for maintenance'. Which systemd target is the system likely trying to reach?

Accepted Answer

emergency.target. emergency.target gives a single-user root shell with minimal services. rescue.target also gives a shell but with more services loaded. The prompt 'Give root password for maintenance' is typical of emergency mode.

Answer

graphical.target

Answer

multi-user.target

Answer

rescue.target

Question 11

An administrator is troubleshooting a service that fails to start. The administrator wants to view the last 50 lines of the service's journal log entries from the current boot. Which journalctl command should be used?

Accepted Answer

journalctl -u service -b -n 50. journalctl -u service -b -n 50 shows entries for the unit (-u), from current boot (-b), last 50 lines (-n 50).

Answer

journalctl -f -n 50 -u service

Answer

journalctl -u service --since today

Answer

journalctl -x -n 50 -u service

Question 12

An administrator needs to apply a set of permissions to an existing directory and all its contents, setting the owner to 'rwx', group to 'rx', and others to '---'. Additionally, newly created files within the directory should inherit the group. Which commands should the administrator run? (Assume the directory is /data, and the group is 'staff'.)

Accepted Answer

chmod -R 750 /data; chmod g+s /data. chmod -R 750 /data sets permissions recursively. chmod g+s /data sets the SGID bit so new files inherit the group. The other options are missing SGID or have wrong permissions.

Answer

chmod 750 /data; chmod g+s /data

Answer

chmod -R 755 /data; chmod g+s /data

Answer

chmod -R 750 /data

Question 13

A technician needs to create a new ext4 filesystem on /dev/sdb1 and mount it persistently at /mnt/data. Which set of commands accomplishes this?

Accepted Answer

mkfs -t ext4 /dev/sdb1; mount /dev/sdb1 /mnt/data; echo '/dev/sdb1 /mnt/data ext4 defaults 0 2' >> /etc/fstab. Only option A correctly creates the filesystem, mounts it immediately, and adds the entry to /etc/fstab for persistent mounting. Option B creates the filesystem and adds the fstab entry, but does not mount the filesystem, so it does not accomplish the task of having the filesystem mounted immediately.

Answer

mkfs.ext4 /dev/sdb1; echo '/dev/sdb1 /mnt/data ext4 defaults 0 2' >> /etc/fstab

Answer

mkfs.ext4 /dev/sdb1; mount /dev/sdb1 /mnt/data

Answer

echo '/dev/sdb1 /mnt/data ext4 defaults 0 2' >> /etc/fstab; mount -a

Answer

fdisk /dev/sdb1; mount /dev/sdb1 /mnt/data; echo '/dev/sdb1 /mnt/data ext4 defaults 0 2' >> /etc/fstab

Question 14

A system administrator wants to display a list of all currently running processes, including those of other users, with full command lines. Which TWO commands can achieve this? (Select TWO.)

Accepted Answer

ps aux. ps aux and ps -ef both show all processes with full command lines. top and htop show dynamic views but not in a static list format. pstree shows process tree.

Answer

pstree

Answer

top

Answer

htop

Question 15

An administrator needs to update the package cache and upgrade all installed packages on a Debian-based system. Which TWO commands are appropriate for this task? (Select TWO.)

Accepted Answer

apt update. apt update refreshes the package cache; apt upgrade upgrades all packages. apt-get update and apt-get upgrade are also valid. The question asks for two commands; typically the sequence is update then upgrade. Both apt and apt-get are acceptable.

Answer

apt dist-upgrade

Answer

dpkg --configure -a

Answer

apt list --upgradable