XK0-005 System Management Practice Test 10 — 15 Questions

Question 1

A Linux system has a directory with permissions drwxr-xr-x. A user in the group 'dev' tries to create a new file inside this directory. Which permission is missing that prevents the user from creating the file?

Accepted Answer

Write permission for the group. The directory has write permission for the owner, but only read and execute for the group. To create a file, the user needs write permission on the directory, which is not granted to the group.

Answer

Write permission for the owner

Answer

Sticky bit is set

Answer

Execute permission for the group

Question 2

An administrator wants to find all files larger than 100MB in the /var directory. Which command should be used?

Accepted Answer

find /var -type f -size +100M. The find command with -size +100M correctly locates files larger than 100MB.

Answer

find /var -size +100kb

Answer

ls -l /var | grep 100M

Answer

du -sh /var/* | grep M

Question 3

A system administrator runs the command 'chmod 4755 /usr/local/bin/backup'. What effect does this have on the file?

Accepted Answer

Sets the SUID bit and gives rwxr-xr-x permissions. The 4 in the first digit sets the SUID bit, so the file runs with the owner's permissions. 755 sets rwxr-xr-x.

Answer

Sets the sticky bit and gives rwxr-xr-x permissions

Answer

Sets the SGID bit and gives rwxr-xr-x permissions

Answer

Sets the SUID bit and gives rwxrwxr-x permissions

Question 4

A technician needs to replace the string 'old_config' with 'new_config' in the file /etc/app.conf and save the changes in place. Which sed command accomplishes this?

Accepted Answer

sed -i 's/old_config/new_config/g' /etc/app.conf. The -i flag edits the file in place, and the s///g substitution replaces all occurrences.

Answer

sed 's/old_config/new_config/' /etc/app.conf

Answer

sed -n 's/old_config/new_config/p' /etc/app.conf

Answer

sed -i 's/old_config/new_config/' /etc/app.conf

Question 5

Which command displays the current default umask value for a user?

Accepted Answer

umask. The umask command without arguments prints the current umask value.

Answer

chmod

Answer

set

Answer

ls -l

Question 6

A Linux system fails to boot, and the administrator wants to access a minimal environment to repair the system. Which systemd target should be specified in the kernel command line to achieve this?

Accepted Answer

rescue.target. The rescue.target provides a minimal environment for system recovery.

Answer

emergency.target

Answer

multi-user.target

Answer

graphical.target

Question 7

An administrator runs 'rpm -V httpd' and sees output like 'S.5....T. /etc/httpd/conf/httpd.conf'. What does this indicate?

Accepted Answer

The file has been modified since installation. The rpm -V command verifies installed packages. The output shows that the file size, MD5 checksum, and modification time have changed from the package's original.

Answer

The file has been deleted

Answer

The file has incorrect permissions

Answer

The file is corrupted

Question 8

A system administrator needs to monitor real-time process information and system resource usage. Which two commands can be used for this purpose? (Choose two.)

Accepted Answer

top. top and htop are interactive process viewers that show real-time updates.

Answer

kill

Answer

jobs

Answer

ps aux

Question 9

An administrator wants to locate files that have the SUID or SGID special permission set. Which three find commands can accomplish this? (Choose three.)

Accepted Answer

find / -perm /6000. The find command with -perm can search for permissions in symbolic or octal modes, and using -4000 or -2000 finds SUID or SGID respectively.

Answer

find / -perm 2000

Answer

find / -perm 4000

Question 10

A technician needs to apply an access control list (ACL) to a file to grant read and write permissions to a specific user. Which two commands are used to manage ACLs? (Choose two.)

Accepted Answer

setfacl. setfacl sets ACLs, getfacl retrieves them.

Answer

chmod

Answer

chown

Answer

umask

Question 11

A user wants to view the contents of a text file one page at a time. Which two commands can be used? (Choose two.)

Accepted Answer

less. less and more are pagers that display content one screen at a time.

Answer

cat

Answer

tail

Answer

head

Question 12

An administrator needs to permanently disable a systemd service from starting at boot. Which two commands can achieve this? (Choose two.)

Accepted Answer

systemctl disable servicename. systemctl disable and systemctl mask both prevent a service from starting at boot, but mask also prevents manual start.

Answer

systemctl stop servicename

Answer

systemctl kill servicename

Answer

systemctl unmask servicename

Question 13

A system administrator is investigating a performance issue and wants to view kernel-related messages. Which three commands can be used to access kernel ring buffer messages? (Choose three.)

Accepted Answer

dmesg. dmesg displays kernel ring buffer. journalctl -k shows kernel messages from systemd journal. cat /var/log/kern.log if available, but /var/log/messages often contains kernel messages; however, the question expects common commands.

Answer

tail -f /var/log/syslog

Answer

systemctl status

Question 14

An administrator needs to create a hard link to an existing file. Which two statements are true about hard links? (Choose two.)

Accepted Answer

Hard links are indistinguishable from the original file. Hard links share the same inode and cannot span filesystems. They cannot link to directories.

Answer

Hard links can be created for directories

Answer

Hard links can be created across different filesystems

Answer

Deleting the original file removes the hard link

Question 15

A technician wants to extract the third column of a tab-separated file and sort the output uniquely. Which three commands can be combined using pipes to achieve this? (Choose three.)

Accepted Answer

cut -f3. cut extracts columns, sort sorts them, uniq removes duplicates. tee would write to file and stdout, not needed.

Answer

tee

Answer

wc -l