CompTIA CompTIA Linux+ XK0-004 Questions & Answers

• Question 351:

  Which of the following BEST describes containers running on a Linux system?

  A. Containers only need the namespaces functionality to run on a Linux system available since kernel 2.6.

  B. Containers need a hypervisor to run on a Linux system. Cgroups namespaces are functionalities used for the kernel but not for running containers.

  C. Containers only need the cgroups functionality for running on a Linux system. Namespaces is not a Linux kernel functionality needed for creating and managing containers.

  D. Containers use the cgroups and namespaces functionalities to isolate processes and assign hardware resources to each of those isolated processes.

  Correct Answer: D

  Reference: https://www.linuxjournal.com/content/everything-you-need-know-about-linux-containers-part-ii- working-linux-containers-lxc

• Question 352:

  A Linux administrator needs to remotely update the contents of the www.comptia.org/contacts URL.

  Which of the following commands would allow the administrator to download the current contents of the URL before updating?

  A. curl www.comptia.org/contacts

  B. dig www.comptia.org/contacts

  C. apt-get www.comptia.org/contacts

  D. yum list www.comptia.org/contacts

  Correct Answer: A

  Reference: https://www.thegeekstuff.com/2012/04/curl-examples/

• Question 353:

  A systems administrator needs to append output of ls -lha /opt command to the contents of a test.txt file. Which of the following commands will accomplish this?

  A. ls -lha /opt > test.txt

  B. ls -lha /opt < test.txt

  C. ls -lha /opt >> test.txt

  D. ls -lha /opt << test.txt

  Correct Answer: C

  Reference: https://www.cyberciti.biz/faq/linux-append-text-to-end-of-file/

• Question 354:

  A Linux server has multiple IPs. A Linux administrator needs to verify if the HTTP server port is bound to the correct IP. Which of the following commands would BEST accomplish this task?

  A. route

  B. host

  C. nslookup

  D. netstat

  E. ip

  Correct Answer: D

  Reference: https://www.tecmint.com/find-listening-ports-linux/

• Question 355:

  A Linux administrator must identify a user with high disk usage. The administrator runs the # du -s / home/* command and gets the following output:

  

  Based on the output, User3 has the largest amount of disk space used. To clean up the file space, the administrator needs to find out more information about the specific files that are using the most disk space.

  Which of the following commands will accomplish this task?

  A. df -k /home/User3/files.txt

  B. du -a /home/User3/*

  C. du -sh /home/User/

  D. find . -name /home/User3 -print

  Correct Answer: C

  Reference: https://unix.stackexchange.com/questions/37221/finding-files-that-use-the-most-disk-space

• Question 356:

  After starting a long-running script, a systems administrator needs to verify the frequency of what is filling up the /var partition and kill it because it is consuming too much space.

  Which of the following is the correct sequence given only a terminal is available?

  A. 1. CTRL-C

  2.

  bg

  3.

  watch df /var

  4.

  CTRL-C

  5.

  fg

  6.

  CTRL-Z

  B. 1. CTRL-C

  2.

  fg

  3.

  watch df /var

  4.

  CTRL-Z

  5.

  bg

  6.

  CTRL-Z

  C. 1. CTRL-Z

  2.

  bg

  3.

  watch df /var

  4.

  CTRL-C

  5.

  fg

  6.

  CTRL-C

  D. 1. CTRL-Z

  2.

  bg

  3.

  watch df /var

  4.

  CTRL-Z

  5.

  fg

  6.

  CTRL-C

  Correct Answer: D

• Question 357:

  Which of the following can be used to boot a DVD from a remote device to initialize a Linux system setup on bare metal hardware as if it is a local DVD?

  A. UEFI

  B. PXE

  C. NFS

  D. GRUB

  Correct Answer: A

  Reference: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/ installation_guide/ch-boot-x86

• Question 358:

  An administrator receives a warning about a filesystem filling up, and then identifies a large file located at / tmp/largelogfile. The administrator deletes the file, but no space is recovered on the filesystem.

  Which of the following commands would BEST assists the administrator in identifying the problem?

  A. lsof | grep largelogfile

  B. pkill /tmp/largelogfile

  C. pgrep largelogfile

  D. ps -ef | grep largelogfile

  Correct Answer: A

  Reference: https://access.redhat.com/solutions/2316

• Question 359:

  Which of the following is the BEST reason for not storing database files in the /var directory?

  A. The /var filesystem is not fast enough for database files.

  B. The number of files in /var is limited by the available inodes.

  C. Files in /var do not have strict file permissions.

  D. If log files fill up /var, it might corrupt the database.

  Correct Answer: D

• Question 360:

  A technical support engineer receives a ticket from a user who is trying to create a 1KB file in the /tmp directory and is getting the following error: No space left on device. The support engineer checks the /tmp directory, and it has 20GB of free space.

  Which of the following BEST describes a possible cause for this error?

  A. The /tmp directory is not mounted.

  B. The filesystem is formatted with a 4MB block size.

  C. the filesystem ran out of inodes.

  D. The /tmp directory has been set with an immutable attribute.

  Correct Answer: C

  Reference: https://www.maketecheasier.com/fix-linux-no-space-left-on-device-error/