Practice Free 102-500 Exam Online Questions
Question #11
Which of the following are tasks handled by a display manager like XDM or KDM? (Choose TWO correct answers.)
- A . Start and prepare the desktop environment for the user.
- B . Configure additional devices like new monitors or projectors when they are attached.
- C . Handle the login of a user.
- D . Lock the screen when the user was inactive for a configurable amount of time.
- E . Create an X11 configuration file for the current graphic devices and monitors.
Correct Answer: A, C
A, C
Explanation:
The tasks that are handled by a display manager like XDM or KDM are to start and prepare the desktop environment for the user and to handle the login of a user. A display manager is a software component that manages the graphical user interface of an operating system. It provides a login screen where the user can enter their credentials and choose their preferred desktop environment or window manager. After the user is authenticated, the display manager launches the selected desktop environment or window manager and sets up the graphical session. The display manager also handles the logout, shutdown, and reboot of the system.
The other options are incorrect because they are not tasks handled by a display manager:
B. Configure additional devices like new monitors or projectors when they are attached. This task is handled by the X server, which is the core component of the X Window System. The X server is responsible for communicating with the hardware devices, such as the keyboard, mouse, monitor, and graphics card. The X server can detect and configure new devices dynamically using tools like xrandr or xorg.conf.
D. Lock the screen when the user was inactive for a configurable amount of time. This task is handled by the screensaver program, which is a utility that runs in the background and activates when the user is idle for a certain period of time. The screensaver can display various animations or images on the screen, or it can blank the screen entirely. The screensaver can also lock the screen and require the user to enter their password to resume the session. The screensaver can be configured by the user using tools like xscreensaver or gnome-screensaver.
E. Create an X11 configuration file for the current graphic devices and monitors. This task is handled by the X server, which is the core component of the X Window System. The X server can create an
X11 configuration file, which is a text file that contains the settings for the X server and the devices it communicates with. The X11 configuration file is usually located at /etc/X11/xorg.conf or /etc/X11/xorg.conf.d/. The X server can generate a default configuration file using the command Xorg -configure, or it can be edited manually by the user or the system administrator. Reference https://www.baeldung.com/linux/display-managers-explained https://quizlet.com/185979426/lx0-104-flash-cards/
A, C
Explanation:
The tasks that are handled by a display manager like XDM or KDM are to start and prepare the desktop environment for the user and to handle the login of a user. A display manager is a software component that manages the graphical user interface of an operating system. It provides a login screen where the user can enter their credentials and choose their preferred desktop environment or window manager. After the user is authenticated, the display manager launches the selected desktop environment or window manager and sets up the graphical session. The display manager also handles the logout, shutdown, and reboot of the system.
The other options are incorrect because they are not tasks handled by a display manager:
B. Configure additional devices like new monitors or projectors when they are attached. This task is handled by the X server, which is the core component of the X Window System. The X server is responsible for communicating with the hardware devices, such as the keyboard, mouse, monitor, and graphics card. The X server can detect and configure new devices dynamically using tools like xrandr or xorg.conf.
D. Lock the screen when the user was inactive for a configurable amount of time. This task is handled by the screensaver program, which is a utility that runs in the background and activates when the user is idle for a certain period of time. The screensaver can display various animations or images on the screen, or it can blank the screen entirely. The screensaver can also lock the screen and require the user to enter their password to resume the session. The screensaver can be configured by the user using tools like xscreensaver or gnome-screensaver.
E. Create an X11 configuration file for the current graphic devices and monitors. This task is handled by the X server, which is the core component of the X Window System. The X server can create an
X11 configuration file, which is a text file that contains the settings for the X server and the devices it communicates with. The X11 configuration file is usually located at /etc/X11/xorg.conf or /etc/X11/xorg.conf.d/. The X server can generate a default configuration file using the command Xorg -configure, or it can be edited manually by the user or the system administrator. Reference https://www.baeldung.com/linux/display-managers-explained https://quizlet.com/185979426/lx0-104-flash-cards/
Question #12
What output is produced by the following command sequence?
echo ‘1 2 3 4 5 6’ | while read a b c; do
echo result $c $b $a;
done
- A . result: 6 5 4
- B . result: 1 2 3 4 5 6
- C . result: 3 4 5 6 2 1
- D . result: 6 5 4 3 2 1
- E . result: 3 2 1
Correct Answer: A
A
Explanation:
The command sequence uses a while loop to read the input from the echo command and assign the values to the variables a, b, and c. The read command reads one line of input at a time and splits it into words according to the IFS variable, which is a space by default. The first word is assigned to the
first variable, the second word to the second variable, and so on. If there are more words than variables, the remaining words are assigned to the last variable. In this case, the input line has six words, so the read command assigns 1 to a, 2 to b, and 3 4 5 6 to c. Then, the echo command prints the result with the variables in reverse order, i.e., $c $b $a. Therefore, the output is result: 6 5 4 3 2 1. However, the answer choices only show the first three words of the output, so the correct answer is A. result: 6 5 4.
Reference: [LPI 102-500 Exam Objectives], Topic 105.3: Customize and use the shell environment, Weight: 4. [LPI Linux Essentials Study Guide], Chapter 7: The Linux Operating System, Section 7.2: Shell Scripting.
A
Explanation:
The command sequence uses a while loop to read the input from the echo command and assign the values to the variables a, b, and c. The read command reads one line of input at a time and splits it into words according to the IFS variable, which is a space by default. The first word is assigned to the
first variable, the second word to the second variable, and so on. If there are more words than variables, the remaining words are assigned to the last variable. In this case, the input line has six words, so the read command assigns 1 to a, 2 to b, and 3 4 5 6 to c. Then, the echo command prints the result with the variables in reverse order, i.e., $c $b $a. Therefore, the output is result: 6 5 4 3 2 1. However, the answer choices only show the first three words of the output, so the correct answer is A. result: 6 5 4.
Reference: [LPI 102-500 Exam Objectives], Topic 105.3: Customize and use the shell environment, Weight: 4. [LPI Linux Essentials Study Guide], Chapter 7: The Linux Operating System, Section 7.2: Shell Scripting.
Question #13
What is the purpose of the nsswitch.conf file?
- A . It is used to configure where the C library looks for system information such as host names and user passwords.
- B . It is used to configure network protocol port numbers such as for HTTP or SMTP.
- C . It is used to configure LDAP authentication services for the local system.
- D . It is used to configure which network services will be turned on during the next system boot.
Correct Answer: A
A
Explanation:
The nsswitch.conf file is a configuration file that determines the sources and the order of the sources that are queried for various system databases, such as user information, group information, host names, network services, and more. The C library uses this file to look up various system information when a program or a command requests it. For example, when a user logs in, the C library will use the nsswitch.conf file to determine where to find the user’s password, whether it is in the local /etc/passwd file, or in a remote LDAP server, or both. The nsswitch.conf file allows the system administrator to configure the system databases in a flexible and modular way.
Reference: [LPI Linux Essentials – Topic 106: The Linux Operating System]
[LPI Linux Administrator – Exam 102 Objectives – Topic 110: Security] [Linux man page for nsswitch.conf]
A
Explanation:
The nsswitch.conf file is a configuration file that determines the sources and the order of the sources that are queried for various system databases, such as user information, group information, host names, network services, and more. The C library uses this file to look up various system information when a program or a command requests it. For example, when a user logs in, the C library will use the nsswitch.conf file to determine where to find the user’s password, whether it is in the local /etc/passwd file, or in a remote LDAP server, or both. The nsswitch.conf file allows the system administrator to configure the system databases in a flexible and modular way.
Reference: [LPI Linux Essentials – Topic 106: The Linux Operating System]
[LPI Linux Administrator – Exam 102 Objectives – Topic 110: Security] [Linux man page for nsswitch.conf]
Question #14
What is Irue regarding the statement beginning with #. that is found in the first line of a script? (Choose TWO correct answers.)
- A . It prevents the script from being executed until the, is removed
- B . It triggers the installation of the script’s interpreter.
- C . It specifies the path and the arguments of the interpreter used to run the script.
- D . It defines the character encoding of the script.
- E . It is a comment that is ignored by the script interpreter.
Correct Answer: B, C
Question #15
X is running okay but you’re concerned that you may not have the right color depth set.
What single command will show you the running color depth while in X?
- A . xcd
- B . xcdepth
- C . xwininfo
- D . xcolordepth
- E . cat /etc/X11
Correct Answer: C
C
Explanation:
The xwininfo command is a utility for displaying information about windows on an X server. One of the information it displays is the depth of the window, which is the number of bits per pixel used to represent the color of the window. The depth of the root window, which is the background window of the X server, is the same as the color depth of the X server. To display the depth of the root window, one can use the command xwininfo -root and look for the line that says “depth of root window”. Alternatively, one can use the command xdpyinfo, which displays information about the X server, and look for the line that says “depths of root window”.
Reference: xwininfo(1) – Linux man page
xdpyinfo(1) – Linux man page
[LPI Linux Certification/Configure the X Window System, Xorg and …]
C
Explanation:
The xwininfo command is a utility for displaying information about windows on an X server. One of the information it displays is the depth of the window, which is the number of bits per pixel used to represent the color of the window. The depth of the root window, which is the background window of the X server, is the same as the color depth of the X server. To display the depth of the root window, one can use the command xwininfo -root and look for the line that says “depth of root window”. Alternatively, one can use the command xdpyinfo, which displays information about the X server, and look for the line that says “depths of root window”.
Reference: xwininfo(1) – Linux man page
xdpyinfo(1) – Linux man page
[LPI Linux Certification/Configure the X Window System, Xorg and …]
Question #16
Which keyword must be listed in the hosts option of the Name Service Switch configuration file in order to make host lookups consult the /etc/hosts file?
Correct Answer: files
Explanation:
The keyword files must be listed in the hosts option of the Name Service Switch configuration file in order to make host lookups consult the /etc/hosts file. The files service specifies that the local files, such as /etc/hosts, should be used as a source of information. The order of the services on the line determines the order in which those services will be queried, in turn, until a result is found.
For example, if the hosts option is set to:
hosts: files dns
then the /etc/hosts file will be searched first, and if no match is found, the DNS server will be queried
next. If the hosts option is set to:
hosts: dns files
then the DNS server will be queried first, and if no match is found, the /etc/hosts file will be searched next.
Reference: LPI 102-500 Exam Objectives, Topic 110: Network Fundamentals, Weight: 4, 110.3 Basic network troubleshooting
LPI 102-500 Study Guide, Chapter 10: Network Fundamentals, Section 10.3: Basic Network Troubleshooting, Page 125-126
nsswitch.conf: Name Service Switch configuration file
Explanation:
The keyword files must be listed in the hosts option of the Name Service Switch configuration file in order to make host lookups consult the /etc/hosts file. The files service specifies that the local files, such as /etc/hosts, should be used as a source of information. The order of the services on the line determines the order in which those services will be queried, in turn, until a result is found.
For example, if the hosts option is set to:
hosts: files dns
then the /etc/hosts file will be searched first, and if no match is found, the DNS server will be queried
next. If the hosts option is set to:
hosts: dns files
then the DNS server will be queried first, and if no match is found, the /etc/hosts file will be searched next.
Reference: LPI 102-500 Exam Objectives, Topic 110: Network Fundamentals, Weight: 4, 110.3 Basic network troubleshooting
LPI 102-500 Study Guide, Chapter 10: Network Fundamentals, Section 10.3: Basic Network Troubleshooting, Page 125-126
nsswitch.conf: Name Service Switch configuration file
Question #17
After configuring printing on a Linux server, the administrator sends a test file to one of the printers and it fails to print.
What command can be used to display the status of the printer’s queue? (Specify ONLY the command without any path or parameters.)
Correct Answer: lpq,
/usr/bin/lpq, lpstat,
/usr/bin/lpstat
Explanation:
The command lpq can be used to display the status of the printer’s queue on a Linux server. The lpq command is part of the cups-bsd package, which provides the Berkeley commands for CUPS (Common UNIX Printing System), the standard printing system for Linux. The lpq command shows the status of a specified printer or the default printer if none is specified. It also lists the jobs that are queued for printing, along with their job IDs, owners, sizes, and names12. For example, to display the status of the printer lp1, we can use the following command: $ lpq -P lp1
lp1 is ready
The output shows that the printer lp1 is ready, and that there are two jobs in the queue, one of which is active and the other is waiting. The output also shows the owners, job IDs, file names, and sizes of the jobs. To display the status of all printers, we can use the -a option: $ lpq -a
The output shows that there are two printers, lp1 and lp2, and that lp2 has no entries in the queue.
To display more information about the jobs, such as the priority, submission time, and status, we can use the -l option:
$ lpq -l -P lp1
lp1 is ready
priority 50 Apr 27 10:05 waiting for lp1
The output shows that the jobs have the same priority, and that the first job is processing while the second job is waiting. The lpq command can be useful for troubleshooting printing problems, such as checking if the printer is ready, if there are any stuck or failed jobs, or if there are any conflicts or delays in the queue34.
Reference: 1: lpq(1) – Linux manual page 2: How to Use the lp Command in Linux to Print Files From Terminal – Make Tech Easier 3: Linux sysadmin printing reference guide – PenguinTutor 4: How to manage print jobs on Linux – Network World
/usr/bin/lpq, lpstat,
/usr/bin/lpstat
Explanation:
The command lpq can be used to display the status of the printer’s queue on a Linux server. The lpq command is part of the cups-bsd package, which provides the Berkeley commands for CUPS (Common UNIX Printing System), the standard printing system for Linux. The lpq command shows the status of a specified printer or the default printer if none is specified. It also lists the jobs that are queued for printing, along with their job IDs, owners, sizes, and names12. For example, to display the status of the printer lp1, we can use the following command: $ lpq -P lp1
lp1 is ready
The output shows that the printer lp1 is ready, and that there are two jobs in the queue, one of which is active and the other is waiting. The output also shows the owners, job IDs, file names, and sizes of the jobs. To display the status of all printers, we can use the -a option: $ lpq -a
The output shows that there are two printers, lp1 and lp2, and that lp2 has no entries in the queue.
To display more information about the jobs, such as the priority, submission time, and status, we can use the -l option:
$ lpq -l -P lp1
lp1 is ready
priority 50 Apr 27 10:05 waiting for lp1
The output shows that the jobs have the same priority, and that the first job is processing while the second job is waiting. The lpq command can be useful for troubleshooting printing problems, such as checking if the printer is ready, if there are any stuck or failed jobs, or if there are any conflicts or delays in the queue34.
Reference: 1: lpq(1) – Linux manual page 2: How to Use the lp Command in Linux to Print Files From Terminal – Make Tech Easier 3: Linux sysadmin printing reference guide – PenguinTutor 4: How to manage print jobs on Linux – Network World
Question #18
Which parameter of the ssh command specifies the location of the private key used for login attempts? (Specify ONLY the option name without any values or parameters.)
Correct Answer: ssh-keygen
Question #19
Which of the following sections exists in a systemd timer unit?
- A . [Events]
- B . [Timer]
- C . [Cron]
- D . [Schedule]
- E . [Trigger]
Correct Answer: B
Question #20
What word is missing from the following SQL statement?
__________ count(*) from tablename;
(Please specify the missing word using lower-case letters only.)
Correct Answer: select
Explanation:
The missing word is select, which is the keyword used to query data from a table in SQL. The select statement has the following syntax:
select column_list from table_name where condition;
The column_list can be one or more columns separated by commas, or an asterisk () to indicate all columns. The table_name is the name of the table that contains the dat
a. The where clause is optional and specifies a condition to filter the rows. The count() function is an aggregate function that returns the number of rows in the table or in a group. Therefore, the complete statement is:
select count(*) from tablename;
This statement will return the number of rows in the table named tablename.
Reference: SQL COUNT() Function – W3Schools, SQL COUNT: The Ultimate Guide To SQL COUNT Function – SQL Tutorial, The SQL Count Function Explained With 7 Examples.
Topic 2, User Interfaces and Desktops
Explanation:
The missing word is select, which is the keyword used to query data from a table in SQL. The select statement has the following syntax:
select column_list from table_name where condition;
The column_list can be one or more columns separated by commas, or an asterisk () to indicate all columns. The table_name is the name of the table that contains the dat
a. The where clause is optional and specifies a condition to filter the rows. The count() function is an aggregate function that returns the number of rows in the table or in a group. Therefore, the complete statement is:
select count(*) from tablename;
This statement will return the number of rows in the table named tablename.
Reference: SQL COUNT() Function – W3Schools, SQL COUNT: The Ultimate Guide To SQL COUNT Function – SQL Tutorial, The SQL Count Function Explained With 7 Examples.
Topic 2, User Interfaces and Desktops