XK0-005 Practice Test 8 — 10 Questions

Question 1

A user reports that a recently installed application fails to start. The application was installed via a shell script that added a repository and installed the package. The user runs 'ldd /usr/bin/app' and sees several 'not found' libraries. Which of the following is the MOST likely cause?

Accepted Answer

The installation script did not install all required dependencies.. The `ldd` command lists shared library dependencies for a binary. When it reports 'not found' libraries, it means the dynamic linker cannot locate the required `.so` files. Since the application was installed via a shell script that added a repository and installed the package, the most likely cause is that the script failed to install all required dependencies, leaving the binary unable to resolve its shared library links.

Answer

The kernel version is outdated.

Answer

SELinux is blocking the application.

Answer

The file system is corrupted.

Question 2

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'.. Option A is correct because 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 3

A Linux administrator receives reports that a web application hosted on the company's internal server is intermittently slow. The server runs CentOS 7 and hosts multiple virtual hosts. The administrator checks system resources and notices that the system's swap usage is high. Which of the following is the MOST likely cause of the performance issue?

Accepted Answer

Insufficient physical memory for the workload. High swap usage indicates that the system is actively paging memory to disk because the available physical RAM is insufficient to hold the active working set. This causes significant latency because disk I/O is orders of magnitude slower than RAM, leading to intermittent slowdowns for the web application. The fact that multiple virtual hosts are running on CentOS 7 increases the memory demand, making insufficient physical memory the most likely root cause.

Answer

Misconfigured virtual host causing memory leaks

Answer

Network congestion on the internal network

Answer

Excessive CPU load from a runaway process

Question 4

A Linux administrator is creating a shell script to back up configuration files to a remote server. The script must ensure that if any command fails (e.g., rsync or tar), the script exits immediately and does not continue. Which TWO of the following should be included in the script to achieve this behavior? (Choose two.)

Accepted Answer

trap 'exit 1' ERR. Option A is correct because `trap 'exit 1' ERR` instructs the shell to execute `exit 1` whenever a command returns a non-zero exit status, which immediately terminates the script on any failure. Option D is correct because `set -e` causes the shell to exit immediately if any command (or pipeline, unless overridden) fails, providing a straightforward way to enforce fail-fast behavior in a backup script.

Answer

set -o pipefail

Answer

set -x

Answer

set -u

Question 5

Match each Linux networking command to its purpose.

Question 6

Match each SELinux context component to its description.

Question 7

Match each Linux filesystem to its typical use case.

Question 8

Match each Linux runlevel to its standard systemd target.

Question 9

Match each Linux package manager to its distribution family.

Question 10

Match each Linux process signal to its typical action.