Question 1

A new IO card has been added to the security server to log the opening and closing of the main entrance. A switch is attached, so the interface card returns a 1 when the door is opened and a 0 when the door is closed. Which of the following describes the Linux device to which this switch is attached?
A) /dev/tty0
B) /dev/port
C) /dev/gpio
D) /dev/sg0

Accepted Answer

The answer of A new IO card has been added...

Question 2

A user creates and installs a Linux VM on a local workstation. The VM can only connect to the local workstation. Which of the following BEST represents the default virtual network configuration in this instance?
A) Host-only
B) Bridged
C) NAT
D) Dual-homed

Accepted Answer

Host-only networking allows the VM to communicate only with the host machine and other VMs on the same host, but not with external networks.

Question 3

A Linux administrator needs to set permissions on an application with the following parameters: The owner of the application should be able to read, write, and execute the application. Members of the group should be able to read and execute the application. Everyone else should not have access to the application. Which of the following commands would BEST accomplish these tasks? A) chmod 710 B) chmod 730 C) chmod 750 D) chmod 760

Accepted Answer

The command `chmod 750 <application name>` sets the permissions so that the owner can read, write, and execute (7), the group can read and execute (5), and others have no access (0).

Question 4

Which of the following boot methods can a Linux administrator use to boot a Linux server remotely via a network interface card instead of a local disk?
A) NTP
B) PXE
C) NFS
D) Kickstart

Accepted Answer

PXE (Preboot Execution Environment) allows a computer to boot from a network interface independently of available data storage devices or installed operating systems.

Question 5

A systems administrator is using a Linux laptop to troubleshoot network devices. The administrator runs the following command: # screen /dev/USB0 Which of the following does this command MOST likely accomplish?
A) It copies the network traffic from the device connected to USB0 and screens out rejected traffic.
B) It logs all troubleshooting output from the monitor to external USB0 storage.
C) It monitors USB0 waiting for a network device to be connected to it as an Ethernet device.
D) It allows the administrator to interact with the character device connected to USB0.

Accepted Answer

The command "screen /dev/USB0" is used to open a terminal session to interact with a character device connected to USB0, such as a serial console for network devices.

Question 6

A systems administrator received a request to change the hostname to a new name. Which of the following file configurations should be changed to fix the hostname in the server?
A) /etc/sysconfig/network
B) /etc/hosts
C) /etc/resolv.conf
D) /etc/sysconfig/nsswitch.conf

Accepted Answer

The answer of A systems administrator received a request to...

Question 7

A junior Linux administrator needs to create 16 empty files quickly that will contain sales information for each quarter for the past four years. Which of the following commands will meet this requirement?
A) touch {2015,2016,2017,2018}.{q1,q2,q3,q4}
B) touch [2015,2016,2017,2018].[q1,q2,q3,q4]
C) touch '2015,2016,2017,2018'.'q1,q2,q3,q4'
D) touch {2015.2016.2017.2018}.{q1.q2.q3.q4}

Accepted Answer

The answer of A junior Linux administrator needs to create...

Question 8

A storage administrator in a virtualized environment has been told by a user that there is no space left on the volume to which the user can write. However, a check reveals that there is 20GB of unused space. Which of the following explains the discrepancy?
A) The drive is not formatted
B) The drive is thin provisioned
C) The drive is thick provision eager zeroed
D) The drive space is overallocated

Accepted Answer

Thin provisioning allows more storage to be allocated than is physically available, leading to situations where logical space appears full even if physical space is available.

Question 9

A server administrator notices that one of the servers cannot connect to its gateway, which has the IP 10.10.10.1. Which of the following commands should the administrator execute to determine the default gateway of the server?
A) route -n
B) ip a default-gw
C) ifconfig
D) nslookup

Accepted Answer

The "route -n" command displays the routing table, which includes the default gateway information.

Question 10

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?
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.

Accepted Answer

The answer of Ann, a user, has created a new...

Question 11

A systems administrator needs to allow the Linux server to receive HTTP connections from Internet hosts. By default, the port for HTTP connections is blocked. Which of the following rules should be added in the firewall to allow this type of connection?
A) firewall-cmd --zone=public --add-port=443/tcp --permanent
B) firewall-cmd --zone=internal --add-port=80/tcp --permanent
C) firewall-cmd --zone=public --add-port=80/tcp --permanent
D) firewall-cmd --zone=internal --add-port=443/tcp --permanent

Accepted Answer

The correct rule to allow HTTP connections is to open port 80 (the default port for HTTP) in the public zone, which is typically used for connections from the Internet.

Question 12

A systems administrator is troubleshooting an intermittent network connection at the IP address 192.168.1.23. The administrator wishes to monitor the connection at five-minute intervals for one hour. Which of the following commands will accomplish this task?
A) ping -i 5 192.168.1.23
B) ping -c 12 192.168.1.23
C) ping -c 12 -i 300 192.168.1.23
D) ping -c 60 -i 100 192.168.1.23

Accepted Answer

The answer of A systems administrator is troubleshooting an intermittent...

Question 13

A user receives an access_denied error when trying to modify a file, even though the file permissions are set to 777. Which of the following commands should be used to view additional file permissions?
A) getsebool
B) getenforce
C) ls -z
D) ps -z

Accepted Answer

The `ls -z` command is used to view SELinux context information, which can provide additional file permissions that might be causing the access_denied error.

Question 14

A junior administrator is installing kernel modules. The administrator is given a checklist that outlines the following tasks to be completed: Display currently installed module version. Display which modules loaded at startup. Which of the following commands would be used to accomplish these tasks? (Choose two.)
A) cat /etc/issue
B) insmod
C) lsmod
D) rmmod
E) depmod
F) dmesg

Accepted Answer

The answer of A junior administrator is installing kernel modules....

Question 15

An administrator needs to change the DNS domain search order of a single Linux host to localize it better. Which of the following files should the administrator edit?
A) /etc/resolv.conf
B) /etc/hosts
C) /etc/nsswitch.conf
D) /etc/dhcpd.conf

Accepted Answer

The answer of An administrator needs to change the DNS...

Question 16

A systems administrator manually added a new library to the server. The administrator wants to rebuild the library cache for immediate use. Which of the following commands should the systems administrator run to achieve this goal?
A) make install
B) ldconfig
C) make
D) ldd

Accepted Answer

The `ldconfig` command is used to rebuild the library cache on Linux systems, making newly added libraries available for immediate use.

Question 17

A Linux user uses a VPN to securely access the company's systems from a laptop. Which of the following protocols are MOST likely used to secure the VPN connection? (Choose two.)
A) IPSec
B) HTTP
C) SFTP
D) VNC
E) SSL/TLS
F) SELinux

Accepted Answer

IPSec and SSL/TLS are commonly used protocols to secure VPN connections, providing encryption and secure communication over the internet.

Question 18

A systems administrator notices several intensive tasks executing from users Joe and Ann. These processes are impacting server operations but must be allowed to continue running. Which of the following commands should the systems administrator run to reduce the impact on the server?
A) pkill -u joe ann
B) renice 11 -u joe ann
C) nohup -u joe ann
D) strace -u joe ann

Accepted Answer

The 'renice' command is used to change the priority of running processes. By increasing the nice value (e.g., to 11), the processes will have lower priority, reducing their impact on server operations while allowing them to continue running.

Question 19

Which of the following Linux server roles should be installed to monitor and log local web traffic?
A) Proxy server
B) AAA server
C) SSH server
D) HTTP server
E) Name server

Accepted Answer

A proxy server can be used to monitor and log web traffic by acting as an intermediary between clients and the internet, allowing it to capture and log requests and responses.

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 --dport 22 -j REJECT
B) iptables -A -p tcp -d 192.168.10.24 --dport 22 -j DROP
C) iptables -A -p tcp -d 192.168.10.24 --dport 22 -j FORWARD
D) iptables -A -p tcp -d 192.168.10.24 --dport 22 -j REFUSE

Accepted Answer

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

Exam 18: CompTIA Linux+

A user creates and installs a Linux VM on a local workstation. The VM can only connect to the local workstation. Which of the following BEST represents the default virtual network configuration in this instance?

Which of the following boot methods can a Linux administrator use to boot a Linux server remotely via a network interface card instead of a local disk?

A systems administrator is using a Linux laptop to troubleshoot network devices. The administrator runs the following command: # screen /dev/USB0 Which of the following does this command MOST likely accomplish?

A systems administrator received a request to change the hostname to a new name. Which of the following file configurations should be changed to fix the hostname in the server?

A junior Linux administrator needs to create 16 empty files quickly that will contain sales information for each quarter for the past four years. Which of the following commands will meet this requirement?

A storage administrator in a virtualized environment has been told by a user that there is no space left on the volume to which the user can write. However, a check reveals that there is 20GB of unused space. Which of the following explains the discrepancy?

A server administrator notices that one of the servers cannot connect to its gateway, which has the IP 10.10.10.1. Which of the following commands should the administrator execute to determine the default gateway of the server?

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?

A systems administrator needs to allow the Linux server to receive HTTP connections from Internet hosts. By default, the port for HTTP connections is blocked. Which of the following rules should be added in the firewall to allow this type of connection?

A systems administrator is troubleshooting an intermittent network connection at the IP address 192.168.1.23. The administrator wishes to monitor the connection at five-minute intervals for one hour. Which of the following commands will accomplish this task?

A user receives an access_denied error when trying to modify a file, even though the file permissions are set to 777. Which of the following commands should be used to view additional file permissions?

An administrator needs to change the DNS domain search order of a single Linux host to localize it better. Which of the following files should the administrator edit?

A systems administrator manually added a new library to the server. The administrator wants to rebuild the library cache for immediate use. Which of the following commands should the systems administrator run to achieve this goal?

A Linux user uses a VPN to securely access the company's systems from a laptop. Which of the following protocols are MOST likely used to secure the VPN connection? (Choose two.)

A systems administrator notices several intensive tasks executing from users Joe and Ann. These processes are impacting server operations but must be allowed to continue running. Which of the following commands should the systems administrator run to reduce the impact on the server?

Which of the following Linux server roles should be installed to monitor and log local web traffic?

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?