Question 1

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

Accepted Answer

This is an example of procedures, as it involves documenting step-by-step instructions for a specific task.

Question 2

A junior systems administrator needs to make a packet capture file that will only capture HTTP protocol data to a file called test.pcap . Which of the following commands would allow the administrator to accomplish this task?
A) netcat -p 80 -w test.pcap
B) tshark -r test.pcap -o http
C) tcpdump -i eth0 port 80 -r test.pcap
D) tcpdump -i eth0 port 80 -w test.pcap

Accepted Answer

The answer of A junior systems administrator needs to make...

Question 3

A Linux administrator receives a call from the network operations team that one of the database applications is down on a Linux server. The Linux server is configured with RAID 1 for redundancy, and the array /dev/md0 consists of two devices called /dev/sda1 and /dev/sdb1 . After looking at the status of the RAID 1 array in the /proc/mdstat file, the administrator discovers the RAID 1 array is degraded and the disk on which the database application was installed appears to have failed.  Which of the following steps should the administrator take to remove the device from the RAID array md0 ? (Choose two.)
A) mdadm /dev/md0 --remove / dev/sdb1 mdadm /dev/md0 --remove / dev/sdb1
B) mdadm /dev/sdb1 --fail / dev/md0 mdadm /dev/sdb1 --fail dev/md0
C) mdadm /dev/md0 --fail / dev/sdb1 mdadm /dev/md0 --fail
D) mdadm /dev/sdb1 --remove / dev/md0 mdadm /dev/sdb1 --remove
E) racadm --remove / dev/sdb1 racadm --remove
F) racadm --fail / dev/sdb1 racadm --fail

Accepted Answer

The answer of A Linux administrator receives a call from...

Question 4

The following represents a partial listing of a user's .bashrc file: HISTSIZE=800 HISTFILESIZE=1000 umask 2002 HISTCONTROL=ignoreboth When the user opens a terminal, an error message appears: Octal number out of range Which of the following lines in the partial .bashrc should be modified to prevent the error from occurring?
A) HISTSIZE=800
B) HISTFILESIZE=1000
C) umask 2002
D) HISTCONTROL=ignoreboth

Accepted Answer

The umask value should be a three-digit octal number, and "2002" is not a valid octal number. It should be corrected to a valid umask value like "0022".

Question 5

A Linux team is using Git to version a set of custom scripts. A team member has made an update to a script and published the changes to the repository. Which of the following is the BEST way to retrieve the latest changes to the administrator's local working copy?
A) git fetch
B) git merge
C) git commit
D) git pull

Accepted Answer

The `git pull` command is used to fetch and integrate changes from a remote repository into the local working copy, making it the best choice for retrieving the latest changes.

Question 6

When requesting SSH access to a remote system, a user accidentally emailed the id_rsa key to the administrator. Which of the following should the user do NEXT?
A) Run the ssh-add command to add the remote system to known_hosts . Run the ssh-add command to add the remote system to known_hosts .
B) Ask the administrator to run chmod 600 id_rsa on the remote system. Ask the administrator to run chmod 600 id_rsa on the remote system.
C) Delete id_rsa key file and send the id_rsa.pub key file instead. Delete key file and send the id_rsa.pub key file instead.
D) Stop using that key and run ssh-keygen to generate a new key pair. Stop using that key and run ssh-keygen to generate a new key pair.

Accepted Answer

The private key (id_rsa) should be kept secure and never shared. If it has been accidentally shared, it is compromised. The user should stop using that key and generate a new key pair using ssh-keygen.

Question 7

Joe, a user, creates a short shell script, shortscript.sh , and saves it in his home directory with default permissions and paths. He then attempts to run the script by typing ./shortscript.sh , but the command fails to execute. Which of the following commands would have allowed the script to run?
A) chmod u+x shortscript.sh
B) source ./shortscript.sh
C) chmod 155 ~/shortscript.sh
D) chgrp shortscript.sh Joe

Accepted Answer

The script likely lacks execute permissions, which can be added with `chmod u+x shortscript.sh`.

Question 8

An administrator notices a website hosted on an httpd web server is not loading. Upon further inspection, the administrator learns there are no processes running. When starting the service, the site operates correctly for a few minutes before the process disappears again. Which of the following should the administrator consider as the MOST likely possibility before troubleshooting the issue?
A) The CPU has too much load, causing it to overheat, and the kernel is automatically killing the processes to keep the CPU cool.
B) An external database to which the web server connects is offline, causing httpd to die due to execution errors. An external database to which the web server connects is offline, causing to die due to execution errors.
C) Shared libraries, which were recently updated, are causing compatibility issues and httpd to die due to version mismatch. Shared libraries, which were recently updated, are causing compatibility issues and to die due to version mismatch.
D) The out-of-memory killer was activated due to low available memory, causing the kernel to kill the processes automatically.
E) The server is intermittently losing access to the network, causing socket errors that trigger httpd to die. The server is intermittently losing access to the network, causing socket errors that trigger to die.

Accepted Answer

The out-of-memory killer is a mechanism in the Linux kernel that automatically terminates processes when the system is running low on memory. This is a common cause for processes disappearing unexpectedly.

Question 9

Given the output below: [root@appserver ~]# rm config.txt rm: remove regular file 'config.txt'? yes rm: cannot remove 'config.txt': Operation not permitted Which of the following might be the cause?
A) The file config.txt does not have the user write bit set. The file config.txt does not have the user write bit set.
B) The file config.txt does not exist. does not exist.
C) The file config.txt has the immutable attribute set. has the immutable attribute set.
D) The file config.txt has an ACL that does not permit deletion by others. has an ACL that does not permit deletion by others.

Accepted Answer

The answer of Given the output below: [root@appserver ~]# rm...

Question 10

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

Accepted Answer

The answer of A systems administrator needs to run the...

Question 11

A user is reporting unusual slowness when trying to transfer a large file to an NFS server from a workstation. The administrator runs tracepath and gets the following output:  Which of the following BEST describes the issue and a possible solution?
A) The path MTU is lower than the source MTU. Reduce the source MTU setting.
B) There is latency at the storage device. Work with the storage team to correct the issue.
C) There is latency on an intermediate router. Increase the path MTU to compensate.
D) There are dropped packets at an intermediate router. Work with the network team to correct the issue.

Accepted Answer

The answer of A user is reporting unusual slowness when...

Question 12

The Apache web server was recently installed on a Debian/Ubuntu server. The web server fails and a review of log messages on another partition reveals the installation was not completed properly due to lack of disk space. After clearing the files, the systems administrator has requested the installation to be performed again. Which of the following command lines will perform this task? (Choose two.)
A) apt-get install apache2
B) apt-get --purge remove acache2
C) apt-get --reinstall install apache2
D) apt-get --reinstall apache2

Accepted Answer

The answer of The Apache web server was recently installed...

Question 13

A company requires all servers to be configured with the BIOS on Coordinated Universal Time and the OS on Central Standard Time. Which of the following can be used to change the time according to these requirements? (Choose two.)
A) localectl
B) LC_ALL
C) date
D) time
E) hwclock
F) crontab

Accepted Answer

The answer of A company requires all servers to be...

Question 14

A Linux administrator needs to add some files in a directory to the Git repository but must exclude some local .tmp files that are occasionally created by the scripts. Which of the following is the BEST way to accomplish this task?
A) git rm .tmp
B) git add -x .tmp *
C) echo .tmp >> .gitignore
D) rm -rf .tmp

Accepted Answer

Adding ".tmp" to the .gitignore file will ensure that any files with the .tmp extension are ignored by Git, preventing them from being added to the repository.

Question 15

Which of the following can be used to check the status of wireless devices that are connected to the system?
A) lsusb
B) iwconfig
C) netstat
D) ifconfig

Accepted Answer

`iwconfig` is used to configure wireless network interfaces and can display the status of wireless devices connected to the system.

Question 16

A systems administrator needs to connect to a remote Linux machine to run system updates from within a graphical interface. Which of the following should the administrator use?
A) MATE
B) Wayland
C) VNC
D) Unity

Accepted Answer

VNC (Virtual Network Computing) allows remote access to a graphical desktop interface on another machine, which is suitable for running system updates on a remote Linux machine.

Question 17

A Linux administrator tried to copy files to a remote server but received an error message indicating a lack of free space on the disk. The administrator issued a df command and verified adequate free space and inodes on the filesystem. Which of the following commands is the BEST way to diagnose the issue?
A) cat /proc/meminfo
B) lsof -nP | grep deleted
C) find / -type f -size +50M
D) du -a / | sort -n -r | head -n 30

Accepted Answer

The command "lsof -nP | grep deleted" helps identify open files that have been deleted but are still consuming disk space, which could be causing the issue despite showing adequate free space with the df command.

Question 18

A technician suspects a company's border firewall is down, thus blocking Internet access. The technician executes the following commands: #ping -c 1 firewall.company.com 64 bytes from firewall.company.com (192.168.1.1): icmp_seq=1 ttl=64 time=0.061ms #ping -c 16 www.comptia.com 16 packets transmitted, 0 received, 100% packet loss, time 14999ms Which of the following commands should the technician use to BEST determine the source of this outage?
A) tcpdump
B) nmap
C) dig
D) traceroute

Accepted Answer

Traceroute is used to determine the path packets take to reach a destination, which can help identify where the connection is failing.

Question 19

A systems administrator needs to conduct maintenance on a server. Which of the following commands will place the administrator in the appropriate runlevel?
A) init 0
B) telinit 1
C) init 3
D) telinit 6

Accepted Answer

The answer of A systems administrator needs to conduct maintenance...

Question 20

An administrator receives an alarm because the disk of one of the sewers is running out of space. Which of the following commands can be used to see the space that each partition is using?
A) df -h
B) du -scg /
C) fdisk -l
D) fsck /

Accepted Answer

The `df -h` command is used to display the amount of disk space used and available on Linux file systems in a human-readable format.

Exam 18: CompTIA Linux+

A junior systems administrator needs to make a packet capture file that will only capture HTTP protocol data to a file called test.pcap . Which of the following commands would allow the administrator to accomplish this task?

A Linux team is using Git to version a set of custom scripts. A team member has made an update to a script and published the changes to the repository. Which of the following is the BEST way to retrieve the latest changes to the administrator's local working copy?

When requesting SSH access to a remote system, a user accidentally emailed the id_rsa key to the administrator. Which of the following should the user do NEXT?

Joe, a user, creates a short shell script, shortscript.sh , and saves it in his home directory with default permissions and paths. He then attempts to run the script by typing ./shortscript.sh , but the command fails to execute. Which of the following commands would have allowed the script to run?

Given the output below: [root@appserver ~]# rm config.txt rm: remove regular file 'config.txt'? yes rm: cannot remove 'config.txt': Operation not permitted Which of the following might be the cause?

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?

A user is reporting unusual slowness when trying to transfer a large file to an NFS server from a workstation. The administrator runs tracepath and gets the following output: Which of the following BEST describes the issue and a possible solution?

A company requires all servers to be configured with the BIOS on Coordinated Universal Time and the OS on Central Standard Time. Which of the following can be used to change the time according to these requirements? (Choose two.)

A Linux administrator needs to add some files in a directory to the Git repository but must exclude some local .tmp files that are occasionally created by the scripts. Which of the following is the BEST way to accomplish this task?

Which of the following can be used to check the status of wireless devices that are connected to the system?

A systems administrator needs to connect to a remote Linux machine to run system updates from within a graphical interface. Which of the following should the administrator use?

A systems administrator needs to conduct maintenance on a server. Which of the following commands will place the administrator in the appropriate runlevel?

An administrator receives an alarm because the disk of one of the sewers is running out of space. Which of the following commands can be used to see the space that each partition is using?