CompTIA CompTIA Certifications XK0-004 Questions & Answers

• Question 311:

  A Linux administrator needs the "tech" account to have the option to run elevated commands as root. Which of the following commands would BEST meet this goal?

  A. $ su - tech -c "/bin/bash"

  B. # usermod -aG wheel tech

  C. # sudo -i tech

  D. # groupadd -u tech -g root

  Correct Answer: B

• Question 312:

  Which of the following is the purpose of the vmlinux file on a Linux system?

  A. To prevent a Linux kernel panic

  B. To start a Linux virtual machine

  C. To provide the executable kernel for the system

  D. To enable resource access to the network

  Correct Answer: C

  Reference: https://en.wikipedia.org/wiki/Vmlinux

• Question 313:

  A systems administrator wants to know the current status of a series of dd jobs that were started in the background three hours ago. Which of the following commands will achieve this task?

  A. sudo killall -HUP dd

  B. sudo killall dd

  C. sudo killall -TERM dd

  D. sudo killall -USR1 dd

  Correct Answer: D

  Reference: https://askubuntu.com/questions/215505/how-do-you-monitor-the-progress-of-dd

• Question 314:

  A Linux administrator is using a Linux system as a router. During the tests, the administrator discovers that IP packets are not being sent between the configured interfaces. Which of the following commands enables this feature for IPv4 networks?

  A. cat /proc/sys/net/ipv4/ip_route > 1

  B. echo "1" > /proc/sys/net/ipv4/ip_forward

  C. echo "1" > /proc/sys/net/ipv4/ip_route

  D. echo "1" > /proc/sys/net/ipv4/ip_net

  Correct Answer: B

• Question 315:

  A systems administrator has deployed a Linux server based on an Anaconda process with all packages and custom configurations necessary to install a web server role. Which of the following could be used to install more Linux servers with the same characteristics?

  A. /etc/sysconfig/anaconda.cfg

  B. /root/anaconda.auto

  C. /root/anaconda-ks.cfg

  D. /etc/sysconfig/installation.cfg

  Correct Answer: C

  Reference: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/ installation_guide/sn-automating-installation

• Question 316:

  An administrator needs to mount the shared NFS file system testhost:/testvolume to mount point / mnt/testvol and make the mount persistent after reboot. Which of the following BEST demonstrates the commands necessary to accomplish this task?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: A

• Question 317:

  A junior Linux administrator is optimizing a system in which an application needs to take priority 0 when running the process. The administrator runs the ps command and receives the following output:

  

  Given this scenario, which of the following steps will address this issue?

  A. Issue the command renice -n 0 -p 8481

  B. Issue the command renice -p 8481

  C. Issue the command renice -p 0 -n 8481

  D. Issue the command renice -n 8481

  Correct Answer: A

• Question 318:

  A junior administrator of a physical server receives log messages indicating the out-of-memory killer has been active. All memory slots are in use on the motherboard, but additional disk space is available. Space has been allocated for a swap file.

  Which of the following should the administrator use to reduce the output of memory messages?

  A. free : swapoff / swapfile ; swapon -a

  B. mkswap /swapfile; swapon -a

  C. fallocate -l 2G /swapfile andand swapon -a

  D. echo "1" > /proc/meninfo ; swapon / swapfile

  Correct Answer: B

• Question 319:

  Which of the following is a difference between YAML and JSON?

  A. Users can comment in YAML but not in JSON

  B. JSON only uses curly brackets, while YAML only uses square brackets

  C. JSON is used in web development, while YAML is used solely in back-end systems.

  D. YAML has been deprecated for JSON.

  Correct Answer: A

  Reference: https://www.json2yaml.com/yaml-vs-json

• Question 320:

  An administrator reviews the following configuration file provided by a DevOps engineer:

  

  Which of the following would the application parsing this file MOST likely have to support?

  A. YAML B. AJAX

  C. JSON

  D. SOAP

  Correct Answer: C