Question 1

Due to security policies, a restriction was implemented that forbids direct access to the database server. The junior administrator needs to connect using SSH tunneling. Which of the following commands allows the junior administrator to connect from a desktop?
A) ssh -L dbserver.local:5432:localhost:95432 postgres@dbserver.local
B) ssh -L 5432:localhost dbserver.local:5432 postgres
C) ssh -L 95432:localhost postgres@dbserver.local
D) ssh -L 9432:localhost:5432 postgres@dbserver.local

Accepted Answer

The answer of Due to security policies, a restriction was...

Question 2

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

Accepted Answer

The 'dialout' group typically has permissions to access serial ports on many Linux systems. Adding the user to this group should resolve the permission issue.

Question 3

A Linux administrator is testing connectivity to a remote host on a shared terminal. The administrator wants to allow other users to access the terminal while the command is executing. Which of the following commands should the administrator use?
A) bg ping remotehost
B) fg ping remotehost
C) ping remotehost < results
D) ping remotehost &

Accepted Answer

The answer of A Linux administrator is testing connectivity to...

Question 4

Which of the following BEST describes build automation?
A) Automating the creation of software and related processes
B) Automatically categorizing servers in the infrastructure
C) Managing and provisioning servers via automatic templates
D) Bringing systems in line with the desired automated configuration

Accepted Answer

Build automation refers to the process of automating the creation of software, including compiling source code, packaging binaries, running tests, and deploying to production environments.

Question 5

An organization wants to consolidate its entire user information in centralized storage using an X.500-based protocol. Which of the following protocols should be used for this implementation?
A) RADIUS
B) LDAP
C) DNS
D) DHCP

Accepted Answer

The answer of An organization wants to consolidate its entire...

Question 6

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

Accepted Answer

The answer of Which of the following can be used...

Question 7

A Linux administrator has configured a Linux system to be used as a router. The administrator confirms that two network adapters are properly installed and functioning correctly. In addition, the output of the iptables -L command appears to contain a complete firewall configuration. Which of the following commands does the administrator need to issue for the router to be fully functional?
A) echo "1" > /proc/sys/net/ipv4/ip_forward
B) echo "0" > /proc/sys/net/ipv4/tcp_abort_on_overflow
C) echo "0" > /proc/sys/net/ipv4/max_connections
D) echo "1" > /proc/sys/net/ipv4/ip_default_ttl

Accepted Answer

The command "echo '1' > /proc/sys/net/ipv4/ip_forward" enables IP forwarding, which is necessary for a Linux system to function as a router by allowing it to forward packets between network interfaces.

Question 8

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 yum list www. comptia .org/contacts

Accepted Answer

The `curl` command is used to transfer data from or to a server, and it can be used to download the contents of a URL.

Question 9

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

Accepted Answer

The answer of A systems administrator has set up third-party...

Question 10

An administrator needs a bootable USB for installing a new Linux machine. The administrator downloaded the image file and named it as Linux_OS.iso in the /t mp directory. Which of the following commands will accomplish that task?
A) dd input=/tmp/Linux_OS.iso of=/dev/sda bs=512
B) dd in=/tmp/Linux_OS.iso out=/dev/sdb bs=512
C) dd if=/tmp/Linux_OS.iso of=/dev/sda bs=512
D) dd if=/tmp/Linux_OS.iso out=/dev/sdb1 bs=512

Accepted Answer

The answer of An administrator needs a bootable USB for...

Question 11

An operator finds a user is having issues with opening certain files. Which of the following commands would allow the security administrator to list and check the SELinux context?
A) ls -D
B) ls -a
C) ls -Z
D) ls -1

Accepted Answer

The command `ls -Z` is used to display SELinux security context information for files.

Question 12

A Linux administrator wants to fetch a Git repository from a remote Git server. Which of the following is the BEST command to perform this task?
A) git checkout
B) git clone
C) git merge
D) git config

Accepted Answer

The answer of A Linux administrator wants to fetch a...

Question 13

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

Accepted Answer

The 'du' command is used to estimate file space usage, which helps in determining which directories are using the most space.

Question 14

Which of the following would be the BEST solution for a systems administrator to access the graphical user environment of a Linux machine remotely?
A) VNC
B) KDE
C) X11
D) RPC

Accepted Answer

VNC (Virtual Network Computing) is a graphical desktop-sharing system that allows a user to remotely control another computer's desktop interface, making it the best solution for accessing a Linux machine's graphical user environment remotely.

Question 15

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. The filesystem is not fast enough for database files.
B) The number of files in /var is limited by the available inodes. The number of files in is limited by the available inodes.
C) Files in /var do not have strict file permissions. Files in do not have strict file permissions.
D) If log files fill up /var , it might corrupt the database. If log files fill up , it might corrupt the database.

Accepted Answer

If log files fill up the /var directory, it can lead to a lack of space, potentially causing database corruption or failure due to insufficient disk space for database operations.

Question 16

A Linux administrator needs to configure a new firewall without an existing ACL to allow incoming web traffic. The firewall must log the allowed network traffic. Which of the following command sequences would accomplish this task when they are executed in order?
A) iptables -A INPUT -p tcp --dport 80 -J LOG iptables -A INPUT -p tcp --dport 443 -J LOG iptables -I INPUT -p tcp --dport 80 -J ACCEPT iptables -I INPUT -p tcp --dport 443 -J ACCEPT
B) iptables -I INPUT -m multiport -p tcp --dports 80,443 -J LOG iptables -I INPUT -m multiport -p tcp --dports 80,443 -J ACCEPT
C) iptables -A INPUT -m multiport -p tcp --dports 80,443 -J LOG iptables -A INPUT -m multiport -p tcp --dports 80,443 -J ACCEPT
D) iptables -A INPUT -p tcp --dport 80 -J ACCEPT iptables -A INPUT -p tcp --dport 443 -J ACCEPT

Accepted Answer

The answer of A Linux administrator needs to configure a...

Question 17

Given the output below:  Which of the following commands can be used to remove MyPhoto. jpg from the current directory?
A) unlink ./MyPhoto. jpg
B) del Pictures/photo. jpg
C) rm -rf ./Pictures
D) rm -f MyPhoto. jpg
E) ln -rm ./Pictures/photo. jpg

Accepted Answer

The answer of Given the output below:  Which of...

Question 18

A junior systems administrator is configuring localization option environment variables. The administrator is given a checklist of tasks with the following requirements: View current settings of the LC_ALL environment variable only. Modify the LANG environment variable to US English Unicode. Given this scenario, which of the following should be performed to meet these requirements? (Choose two.)
A) echo $LC_ALL
B) locale
C) cat $LC_ALL
D) export LANG = en_US.UTF-8
E) export $LANG = en_US.UTF
F) stty

Accepted Answer

The answer of A junior systems administrator is configuring localization...

Question 19

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 && swapon -a
D) echo "1" > /proc/meninfo ; swapon / swapfile

Accepted Answer

The answer of A junior administrator of a physical server...

Question 20

An administrator is attempting to block SSH connections to 192.168.10.24 using the Linux firewall. After implementing a rule, a connection refused error is displayed when attempting to SSH to 192.168.10.24. Which of the following rules was MOST likely implemented?
A) iptables -A -p tcp -d 192.168.10.24 -dropt 22 -j REJECT
B) iptables -A -p tcp -d 192.168.10.24 -dropt 22 -j DROP
C) iptables -A -p tcp -d 192.168.10.24 -dropt 22 -j FORWARD
D) iptables -A -p tcp -d 192.168.10.24 -dropt 22 -j REFUSE

Accepted Answer

The REJECT target in iptables sends a connection refused message to the client, which matches the "connection refused" error described.

Exam 18: CompTIA Linux+

Due to security policies, a restriction was implemented that forbids direct access to the database server. The junior administrator needs to connect using SSH tunneling. Which of the following commands allows the junior administrator to connect from a desktop?

A Linux administrator is testing connectivity to a remote host on a shared terminal. The administrator wants to allow other users to access the terminal while the command is executing. Which of the following commands should the administrator use?

Which of the following BEST describes build automation?

An organization wants to consolidate its entire user information in centralized storage using an X.500-based protocol. Which of the following protocols should be used for this implementation?

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 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 systems 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?

An administrator needs a bootable USB for installing a new Linux machine. The administrator downloaded the image file and named it as Linux_OS.iso in the /t mp directory. Which of the following commands will accomplish that task?

An operator finds a user is having issues with opening certain files. Which of the following commands would allow the security administrator to list and check the SELinux context?

A Linux administrator wants to fetch a Git repository from a remote Git server. Which of the following is the BEST command to perform this task?

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?

Which of the following would be the BEST solution for a systems administrator to access the graphical user environment of a Linux machine remotely?

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

A Linux administrator needs to configure a new firewall without an existing ACL to allow incoming web traffic. The firewall must log the allowed network traffic. Which of the following command sequences would accomplish this task when they are executed in order?

Given the output below: Which of the following commands can be used to remove MyPhoto. jpg from the current directory?

An administrator is attempting to block SSH connections to 192.168.10.24 using the Linux firewall. After implementing a rule, a connection refused error is displayed when attempting to SSH to 192.168.10.24. Which of the following rules was MOST likely implemented?