Question 1

A Linux systems administrator is troubleshooting an issue with the /home directory running out of space. The administrator needs to determine which directories are using the most space. Which of the following commands should be used?

Accepted Answer

A)  du 
B)  lvs 
C)  df 
D)  fsck

Question 2

A systems administrator needs to run the yum update command two hours after employees log off and leave for the day on Friday. Which of the following is the BEST command to complete the task, if the task only needs to be run once?

Accepted Answer

A)  screen 
B)  cron 
C)  at 
D)  nohup

Question 3

A member of the production group issues the following command: echo "Monday through Friday" > /production_docs/days The command fails to execute, so the user obtains the following output: drwxr--r-- root production 0 Jun 16 2018 production -rw-r--r-- production production 4096 Jun 14 2018 days Which of the following commands should the user execute to BEST fix the issue?

Accepted Answer

A)  chmod g+w production to change the permissions on the days file chmod g+w production to change the permissions on the days file 
B)  chgrp root production_docs/days to change the group ownership of the production_docs/days file chgrp root production_docs/days to change the group ownership of the production_docs/days 
C)  chmod g+S production to set the GUID on the production_docs directory chmod g+S production to set the GUID on the production_docs directory 
D)  chown production to change the ownership of the production_docs directory chown production to change the ownership of the

Question 4

An administrator is logged into a server remotely and wants to determine if the system is a VM. Which of the following commands would assist with this?

Accepted Answer

A)  dmesg 
B)  ps 
C)  top 
D)  vmstat

Question 5

A user is unable to write data to an NFS datastore at /mnt/storage . A df command indicates 50% free inodes. Which of the following commands should the user attempt NEXT to diagnose the situation?

Accepted Answer

A)  df -h /mnt/storage 
B)  du -sh /mnt 
C)  fdisk -l /mnt/storage 
D)  df -i /mnt/storage

Question 6

Which of the following commands would show the default printer on a Linux system?

Accepted Answer

A)  lpr 
B)  lpq 
C)  lpstat 
D)  lspci

Question 7

A junior systems administrator created a new filesystem /dev/sda1 with mountpoint /data and added it to the /etc/fstab for auto-mounting. When the systems administrator tries to mount the file system, the system refuses. Given the output below:  Which of the following steps is necessary?

Accepted Answer

A)  Change the filesystem from /dev/sda1 to /dev/sda2 and reboot. Change the filesystem from to /dev/sda2 and reboot. 
B)  Change the options to auto,dev,sync,rw,nosuid and run the mount -a command. Change the options to auto,dev,sync,rw,nosuid and run the mount -a command. 
C)  Change the mount point to data and reboot. 
D)  Change the dump column to 1 and run the mount -a command. Change the dump column to 1 and run the

Question 8

Ann, a user, has created a new directory and noticed that permissions on the new directory are as follows: drwx------. 1 ann ann 0 Jun 11 08:20 work Which of the following should the administrator do to restore default permissions for newly created directories?

Accepted Answer

A)  Change umask value in /etc/profile . Change umask value in /etc/profile . 
B)  Run chmod command to update permissions. Run chmod command to update permissions. 
C)  Modify directory ownership to ann:ann with chown . Modify directory ownership to ann:ann with chown 
D)  Execute chattr command to restore default access. Execute chattr command to restore default access.

Question 9

A systems administrator needs to retrieve specific fields from a csv file. Which of the following tools would accomplish this task?

Accepted Answer

A)  awk 
B)  sort 
C)  print 
D)  echo

Question 10

A junior Linux administrator needs to access production servers using a secure SSH protocol. Which of the following files should contain the public key to gain remote access to the server?

Accepted Answer

A)  ~/ssh/authorized-keys 
B)  /etc/authorized_keys 
C)  /etc/sshd/ssh.conf 
D)  ~/.ssh/authorized_keys

Question 11

A system administrator has set up third-party log aggregation agents across several cloud instances. The systems administrator wants to create a dashboard of failed SSH attempts and the usernames used. Which of the following files should be watched by the agents?

Accepted Answer

A)  /var/log/audit/audit.log 
B)  /var/log/kern.log 
C)  /var/log/monitor 
D)  /etc/rsyslog.conf

Question 12

A systems administrator documents the instructions on the internal wiki regarding how to turn the company's code into Debian packages. The instructions include the commands used to compile, what tests need to be run, the commands to convert the raw code into a package that apt or dpkg can manage, as well as an explanation of each command. Which of the following is this an example of?

Accepted Answer

A)  Infrastructure as code 
B)  Attributes 
C)  Procedures 
D)  Configuration management

Question 13

In which of the following Linux GUI environments would the Konsole application MOST likely be found?

Accepted Answer

A)  Gnome 
B)  KDE 
C)  Cinnamon 
D)  Unity 
E)  MATE

Question 14

A Linux administrator needs to prevent the Postfix mail transfer agent from starting on boot. Which of the following commands will accomplish this task?

Accepted Answer

A)  systemctl stop postfix.service 
B)  /etc/init.d/postfix stop 
C)  systemctl disable postfix.service 
D)  /etc/init.d/postfix disable

Question 15

A junior administrator is configuring local name lookups for fully qualified domain names in an isolated environment. The administrator is given a checklist and must accomplish the following tasks: Add localhost with loopback address. Add 192.168.192.12/24 to resolve to database01.comptia.org Given this scenario, which of the following steps should the administrator perform to accomplish these tasks?

Accepted Answer

A)  Open the /etc/nsswitch.conf file with a file editor and add the following lines: 127.0.0.1 localhost 192.168.192.12 database01.comptia.org Open the /etc/nsswitch.conf file with a file editor and add the following lines: 
B)  Open the /etc/dhcpd.conf file with a file editor and add the following lines: /etc/dhcpd.conf 
C)  Open the /etc/hosts file with a file editor and add the following lines: /etc/hosts 
D)  Open the /etc/network file with a file editor and add the following lines: /etc/network

Question 16

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?

Accepted Answer

A)  Issue the command renice -n 0 -p 8481 Issue the command renice -n 0 -p 8481 
B)  Issue the command renice -p 8481 renice -p 8481 
C)  Issue the command renice -p 0 -n 8481 renice -p 0 -n 8481 
D)  Issue the command renice -n 8481 renice -n 8481

Question 17

A Linux administrator retrieved a repository of files from a Git server using git clone . The administrator wants to see if a configuration file was added to the repository. Which of the following Git arguments should be used to see the recent modifications?

Accepted Answer

A)  fetch 
B)  log 
C)  init 
D)  pull

Question 18

A user requested a USB serial device to be added to a desktop computer. The device has built-in kernel driver support. The administrator tested the device installation and access, but the user cannot access the serial port. Each time the user attempts to access the device, an error log is created that shows the user does not have permission to use the serial port. Which of the following will add a user to the group that has serial port capabilities?

Accepted Answer

A)  usermod -a -G serialport $USER 
B)  usermod -a -G modem $USER 
C)  usermod -a -G dialout $USER 
D)  usermod -a -G root $USER

Question 19

A junior systems administrator is diagnosing an issue with latency. The administrator issues the command mtr www.comptia.org at a terminal and receives the following output:  Given this scenario and the output, which of the following should be reported to the network team for investigation? (Choose two.)

Accepted Answer

A)  Host 1 is set to filter ICMP reply packets. 
B)  Host 1 is set to filter ICMP echo packets. 
C)  Host 2 is experiencing high packet loss, indicating the link is overloaded. 
D)  Host 2 is experiencing low bandwidth, indicating the ISP is blocking traffic. 
E)  Host 3 is set to filter ICMP reply packets.
F) Host 3 is set to filter ICMP echo packets.

Question 20

An administrator has a CSV file named hosts.csv . The contents of include the following: 192.168.2.57,lnx1prd.example.com,Linux,Production 192.168.2.58,lnx2prd.example.com,Linux,Production 192.168.1.4,server15.example.com,Windows,Development The administrator needs to create a second comma-separated list of only the Linux server IP addresses. Which of the following commands would achieve this need?

Accepted Answer

A)  for ip in $(grep "Linux" hosts.csv | cut -d"," -f1); do echo -n "$ip,"; done 
B)  for ip in $( cut -d"," -f1 hosts.csv | grep "Linux"); do echo -n "$ip,"; done 
C)  for ip in $(grep "Linux" hosts.csv | sed "/$1//'); do echo -n "$ip,"; done 
D)  for ip in $(awk -F, '{print $1}' hosts.csv | grep "Linux"); do echo -n "$ip,"; done

Exam 18: CompTIA Linux+