XK0-006 Practice Test 6 — 10 Questions

Question 1

Refer to the exhibit. A user wants to execute the script 'script.sh' but receives a 'Permission denied' error. Which action should be taken to allow execution?

Accepted Answer

Add execute permission with chmod +x script.sh. The 'Permission denied' error indicates the script lacks the execute permission for the user. The `chmod +x script.sh` command adds the execute permission bit to the file's mode, allowing the user to run it as a program. This is the direct and correct fix for the issue.

Answer

Change the owner to the user with chown

Answer

Change the group to the user's primary group

Answer

Set the permissions to 644 with chmod

Question 2

A system is experiencing high CPU usage due to a background process with PID 2345. The administrator wants to reduce the process's priority by 5 without stopping it. Which command should be used?

Accepted Answer

renice -n +5 -p 2345. The correct command is `renice -n +5 -p 2345` because `renice` adjusts the scheduling priority of a running process. A positive niceness value (+5) lowers the priority (makes the process 'nicer' to others), which reduces CPU usage. The `-n` flag specifies the adjustment value, and `-p` identifies the process by PID. This matches the requirement to reduce priority by 5 without stopping the process.

Answer

kill -STOP 2345

Answer

renice -n -5 -p 2345

Answer

kill -9 2345

Question 3

Refer to the exhibit. A Linux administrator created a systemd service file for a custom script. When starting the service, it fails with 'Unit myservice.service entered failed state.' Which of the following is the most likely cause?

Accepted Answer

The ExecStart path is relative. The most likely cause is that the ExecStart path is relative. Systemd requires absolute paths for ExecStart directives; a relative path (e.g., `./script.sh` or just `script.sh`) will cause the unit to fail immediately because systemd cannot resolve the executable location. The error 'entered failed state' typically results from this path resolution failure.

Answer

The service type should be forking

Answer

The service file lacks an [Install] section

Answer

The Requires directive is missing

Question 4

An administrator runs the command `ls -l file.txt` and sees the permissions `-rwsr-xr-x`. What special permission is set on this file?

Accepted Answer

SUID. The 's' in the owner execute position indicates the SUID (Set User ID) permission is set.

Answer

SGID

Answer

Sticky bit

Answer

No special permission

Question 5

A technician needs to check which package provides the file /usr/bin/foo on a CentOS 8 system. Which command should be used?

Accepted Answer

rpm -qf /usr/bin/foo. On RPM-based systems, rpm -qf queries the package that owns a given file.

Answer

rpm -V /usr/bin/foo

Answer

rpm -qi /usr/bin/foo

Answer

rpm -ql /usr/bin/foo

Question 6

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 7

A Linux server is experiencing intermittent connectivity issues. The administrator reviews the system logs and finds the following messages: 'NETDEV WATCHDOG: eth0: transmit queue 0 timed out'. Which THREE actions are likely to resolve this issue? (Choose three.)

Accepted Answer

Disable NIC offloading features using 'ethtool -K eth0 tx off sg off'.. The 'NETDEV WATCHDOG: eth0: transmit queue 0 timed out' error often indicates that the NIC's hardware offloading features (such as TCP segmentation offload, scatter-gather) are causing the driver to hang or fail to complete transmissions. Disabling these offloads with 'ethtool -K eth0 tx off sg off' forces the CPU to handle packet segmentation and reduces the load on the NIC, which can resolve the timeout.

Answer

Increase the transmit queue length using 'ifconfig eth0 txqueuelen 10000'.

Answer

Change the MTU on the interface to 9000.

Question 8

A server with multiple disks is configured with RAID 5 for performance and redundancy. The administrator notices that write performance is lower than expected. Which RAID level would provide better write performance while still offering fault tolerance with the same number of disks (minimum 4)?

Accepted Answer

RAID 10. RAID 10 (striping of mirrors) provides better write performance than RAID 5 because it does not incur the overhead of calculating and writing parity data on every write operation. With a minimum of four disks, RAID 10 offers fault tolerance (each mirror can survive one disk failure) while delivering the full write speed of the underlying disks, unlike RAID 5 which must update parity across all disks.

Answer

RAID 0

Answer

RAID 6

Answer

RAID 1

Question 9

A user reports that their system is unable to boot after a recent kernel update. The system displays a 'kernel panic' message. Which of the following is the MOST efficient way to boot into a previous kernel version?

Accepted Answer

Select an older kernel from the GRUB menu. The GRUB bootloader stores multiple kernel versions after an update, allowing you to select a previous kernel from its menu at boot time. Choosing an older kernel bypasses the faulty new kernel without requiring additional tools or recovery media, making it the most efficient method to resolve a kernel panic caused by a recent update.

Answer

Use the systemd rescue mode

Answer

Reinstall the operating system

Answer

Boot from a live CD and chroot

Question 10

A cloud engineer needs to automate the deployment of a new virtual machine with a specific configuration using Ansible. Which file format is typically used for Ansible playbooks?

Accepted Answer

YAML. Ansible playbooks are written in YAML (YAML Ain't Markup Language) because it is human-readable, supports complex data structures like lists and dictionaries, and is designed for configuration management. YAML's indentation-based syntax aligns with Ansible's declarative approach, allowing tasks, variables, and handlers to be defined cleanly without the overhead of brackets or tags.

Answer

JSON

Answer

XML

Answer

INI