CompTIA XK0-005 Online Practice Questions and Exam Preparation

CompTIA XK0-005 Online Questions & Answers

• Question 381:

  Linux system users report that over the past few months, a server has stopped responding at least twice each day. Every time this happens, the users have to restart the server to recover it. A systems administrator diagnosing the issue collects the following outputs: csharp Output 1 [Tue Aug 31 16:36:42 2021] oom-killer invoked by java: gfp_mask=0x280da2 order=0, oom_score_adj=0 [Tue Aug 31 16:36:42 2021] java cpuset=/ mems_allowed=0 makefile Output 2 [root@server]# free -m total used free shared buff/cache available Mem: 15819 15026 174 92 619 134 Swap: 0 0 0 Which of the following is the best permanent resolution for the system?

  A. More memory resources
  B. More CPU resources
  C. More network bandwidth
  D. Extended root filesystem
  A. More memory resources

  ---

  Explanation

  The oom-killer is invoked when the system runs out of memory, as indicated by the memory usage in the free -m output. Since swap space is not being used and physical memory is almost entirely consumed, adding more memory resources will prevent the system from running out of memory and invoking the oom-killer to terminate processes.

• Question 382:

  A DevOps engineer wants to implement a new feature on the infrastructure as code configuration. Which of the following commands should the engineer use to accomplish this task?

  A. git pull
  B. git push
  C. git branch
  D. git tag
  C. git branch

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  Explanation

• Question 383:

  A Linux administrator is implementing a CI/CD process for the company's internal accounting web application. Which of the following best defines the purpose of this process?

  A. To automate the process of building, testing, and deploying application components
  B. To perform security penetration tests on deployed applications to identify vulnerabilities
  C. To formalize the approval process of application releases and configuration changes
  D. To leverage code to document the infrastructure, configurations, and dependencies
  A. To automate the process of building, testing, and deploying application components

  ---

  Explanation

  CI/CD (Continuous Integration/Continuous Deployment) is a practice that automates the process of building, testing, and deploying applications. This approach reduces manual intervention, ensuring code changes are integrated and tested frequently, leading to faster and more reliable application deployment.

• Question 384:

  A cloud engineer is asked to copy the file deployment.yaml from a container to the host where the container is running. Which of the following commands can accomplish this task?

  A. docker cp container_id/deployment.yaml deployment.yaml
  B. docker cp container_id:/deployment.yaml deployment.yaml
  C. docker cp deployment.yaml local://deployment.yaml
  D. docker cp container_id/deployment.yaml local://deployment.yaml
  B. docker cp container_id:/deployment.yaml deployment.yaml

  ---

  Explanation

  The command docker cp container_id:/deployment.yaml deployment.yaml can accomplish the task of copying the file deployment.yaml from a container to the host. The docker command is a tool for managing Docker containers and images.

  The cp option copies files or directories between a container and the local filesystem. The container_id is the identifier of the container, which can be obtained by using the docker ps command. The /deployment.yaml is the path of the file in the container, which must be preceded by a slash. The deployment.yaml is the path of the file on the host, which can be relative or absolute. The command docker cp container_id:/deployment.yaml deployment.yaml will copy the file deployment.yaml from the container to the current working directory on the host. This is the correct command to use to accomplish the task. The other options are incorrect because they either use the wrong syntax (docker cp container_id/ deployment.yaml deployment.yaml or docker cp container_id/deployment.yaml local://deployment.yaml) or do not exist (docker cp deployment.yaml local://deployment.yaml).

  References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 19: Managing Cloud and Virtualization Technologies, page 567.

• Question 385:

  A Linux administrator updated the configuration file for the httpd web service. The administrator needs to apply the updated changes to the service without interrupting any running sessions. Which of the following commands should the administrator run to accomplish this task?

  A. systemctl reload httpd
  B. systemctl restart httpd
  C. systemctl status httpd
  D. systemctl mask httpd
  A. systemctl reload httpd

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  Explanation

  The systemctl reload httpd command reloads the Apache HTTP server configuration without terminating any existing connections. This is ideal for applying configuration changes without disrupting the current web traffic, ensuring seamless operation.

• Question 386:

  In which of the following filesystems are system logs commonly stored?

  A. /var
  B. /tmp
  C. /etc
  D. /opt
  A. /var

  ---

  Explanation

  The filesystem that system logs are commonly stored in is /var. The /var filesystem is a directory that contains variable data files on Linux systems. Variable data files are files that are expected to grow in size over time, such as logs, caches, spools, and temporary files. The /var filesystem is separate from the / filesystem, which contains the essential system files, to prevent the / filesystem from being filled up by the variable data files. The system logs are files that record the events and activities of the system and its components, such as the kernel, the services, the applications, and the users. The system logs are useful for monitoring, troubleshooting, and auditing the system. The system logs are commonly stored in the /var/log directory, which is a subdirectory of the /var filesystem. The /var/log directory contains various log files, such as syslog, messages, dmesg, auth.log, and kern.log. The filesystem that system logs are commonly stored in is /var. This is the correct answer to the question. The other options are incorrect because they are not the filesystems that system logs are commonly stored in (/tmp, /etc, or /opt).

  References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 16: Managing Logging and Monitoring, page 487.

• Question 387:

  A Linux administrator needs to replace the content of the test1.sh file with the content of the test2.sh file. Which of the following commands will help accomplish this task?

  A. cat test2.sh >> test1.sh
  B. cat test2.sh > test1.sh
  C. cat test2.sh < test1.sh
  D. cat test2.sh ?test1.sh
  B. cat test2.sh > test1.sh

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  Explanation

• Question 388:

  The MySQL database process that was running on a Linux server suddenly stopped, and the process was killed. Which of the following commands can help identify whether this issue was produced by the OOM killer?

  A. grep /proc/oom_score
  B. grep -ir "out of memory" /var/log
  C. cat /var/run/initramfs/overlayroot.log | grep "out of memory"
  D. cat /sys/block/loop0/events
  B. grep -ir "out of memory" /var/log

  ---

  Explanation

  The grep -ir "out of memory" /var/log command searches through log files in /var/log for any instances of "out of memory" errors, which indicate that the oom-killer terminated processes due to insufficient memory. This is the quickest way to determine if the oom- killer caused the MySQL process to be killed.

• Question 389:

  A Linux systems administrator is updating code. After completing the update, the administrator wants to publish the updated code without including the configuration files. Which of the following should the administrator use to accomplish this task?

  A. git clone
  B. git
  C. .gitignore
  D. git fetch
  C. .gitignore

  ---

  Explanation

  The .gitignore file is used in Git to specify which files or directories should be ignored in a repository. By listing configuration files in the .gitignore file, the administrator ensures they are not included in any future commits or pushes to the remote repository. This is essential when dealing with sensitive or environment-specific files that should not be shared or deployed.

  Git Documentation on .gitignore

• Question 390:

  A Linux systems administrator is troubleshooting an I/O latency on a single CPU server. The administrator runs a top command and receives the following output:

  %Cpu(s): 0.2 us, 33.1 sy, 0.0 ni, 0.0 id, 52.4 wa, 0.0 hi, 0.2 si, 0.0 st

  Which of the following is correct based on the output received from the exe-cuted command?

  A. The server's CPU is taking too long to process users' requests.
  B. The server's CPU shows a high idle-time value.
  C. The server's CPU is spending too much time waiting for data inputs.
  D. The server's CPU value for the time spent on system processes is low.
  C. The server's CPU is spending too much time waiting for data inputs.

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  Explanation

  The server's CPU is spending too much time waiting for data inputs. This can be inferred from the output of the top command, which shows the percentage of CPU time spent in different states. The wa state stands for wait, and it indicates that the CPU is idle while waiting for an I/O operation to complete. In this case, the wa state is 52.4%, which means that more than half of the CPU time is wasted on waiting for data inputs. This can cause a high I/O latency and affect the performance of the server. The other options are not correct based on the output received from the executed command. The server's CPU is not taking too long to process users' requests, because the us state, which stands for user, is only 0.2%, which means that the CPU is barely used by user processes. The server's CPU does not show a high idle-time value, because the id state, which stands for idle, is 0.0%, which means that the CPU is not idle at all. The server's CPU value for the time spent on system processes is not low, because the sy state, which stands for system, is 33.1%, which means that the CPU is heavily used by system processes.

  References: How to Use the Linux top Command (and Understand Its Output); [Understanding Linux CPU Load - when should you be worried?]