Leading LX0-104 Bible 2021

NEW QUESTION 1
In case neither cron.allow nor cron.deny exist in /etc/, which of the following is true?

• A. Without additional configuration, no users may have user specific crontabs.
• B. Without additional configuration, all users may have user specific crontabs.
• C. The cron daemon will refuse to start and report missing files in the system's logfile.
• D. When a user creates a user specific crontab the system administrator must approve it explicitl

Answer: A

Explanation:
Section: Administrative Tasks

NEW QUESTION 2
Which of the following is a valid IPv6 address?

• A. 2001:db8:3241::1
• B. 2001::db8:4581::1
• C. 2001:db8:0g41::1
• D. 2001%db8%9990%%1
• E. 2001.db8.819f..1

Answer: A

Explanation:
Section: Networking Fundamentals

NEW QUESTION 3
After issuing:
function myfunction { echo $1 $2 ; } in Bash, which output does: myfunction A B C Produce?

• A. A B
• B. A B C
• C. A C
• D. B C
• E. C B A

Answer: A

Explanation:
Section: Shells, Scripting and Data Management

NEW QUESTION 4
What is the purpose of the file /etc/profile?

• A. It contains the welcome message that is displayed after login.
• B. It contains security profiles defining which users are allowed to log in.
• C. It contains environment variables that are set when a user logs in.
• D. It contains default application profiles for users that run an application for the first time.

Answer: C

Explanation:
Section: Shells, Scripting and Data Management

NEW QUESTION 5
In which file, if present, must all users be listed that are allowed to use the cron scheduling system? (Specify the full name of the file, including path.)

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:
/etc/cron.allow
Section: Administrative Tasks

NEW QUESTION 6
Which of the following keywords can be used in the file /etc/nsswitch.conf to specify a source for host name lookups? (Choose TWO correct answers.)

• A. resolv
• B. dns
• C. remote
• D. files
• E. hosts

Answer: BD

Explanation:
Section: Networking Fundamentals

NEW QUESTION 7
On a regular users workstation the route command takes a long time before printing out the routing table. Which of the following errors does that indicate?

• A. The local routing information may be corrupted and must be re-validated using a routing protocol.
• B. One of the routers in the routing table is not available which causes the automatic router failure detectionmechanism (ARF-D) to wait for a timeout.
• C. There may accidentally be more than one default router in which case a default router election has to be done on the network in order to choose one router as the default.
• D. DNS resolution may not be working as route by default tries to resolve names of routers and destinations and may run into a timeout.

Answer: D

Explanation:
Section: Networking Fundamentals

NEW QUESTION 8
Which of the following commands are used to manage the environment and shell variables within a shell process? (choose two correct answers.)

• A. export
• B. init
• C. reset
• D. set
• E. tset

Answer: AD

Explanation:
Section: Shells, Scripting and Data Management

NEW QUESTION 9
Which of the following lines are valid in the file /etc/hosts? (Choose TWO correct answers.)

• A. 2001:db8::15 www.example.com www
• B. www.example.com www 203.0.13.15
• C. 203.0.113.15 www.example.com www
• D. www.example.com,www 203.0.13.15,2001:db8::15
• E. 2003.0.113.15,2001:db8::15 www.example.com www

Answer: AC

Explanation:
Section: Networking Fundamentals

NEW QUESTION 10
FILL BLANK
Instead of using specific host names or IP addresses, which string can be used in/etc/hosts.allow
entries to cover any remote host no matter of its name or address? (Specify the relevant string only without any additional options or arguments.)

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:
all
Section: Networking Fundamentals

NEW QUESTION 11
Which of the following commands can modify or set the password expiration for a user? (Choose two correct answers.)

• A. chage
• B. chexpiration
• C. shadowconfig
• D. passwd
• E. userconf

Answer: AD

Explanation:

Section: Security

NEW QUESTION 12
FILL BLANK
Which directory holds the files that configure the xinetd service when using several configuration files instead of an integrated configuration file? (Specify the full path to the directory.)

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:
/etc/xinetd.d/ -or- /etc/xinetd.d
Section: Security

NEW QUESTION 13
Which of the following commands lists all defined variables and functions within Bash?

• A. env
• B. set
• C. env -a
• D. echo $ENV

Answer: B

Explanation:
Section: Shells, Scripting and Data Management

NEW QUESTION 14
Which of the following details can be found in an entry of a user specific crontab? (Choose two correct answers.)

• A. The verbal description of the job.
• B. The syslog facility to where the output of the job should be sent.
• C. The time when the cron job should run.
• D. The command that should be started by the cron job.
• E. The name of the user which should run the job.

Answer: CD

Explanation:
Section: Administrative Tasks

NEW QUESTION 15
What of the following statements is true regarding a display manager?

• A. A display manager handles remote X11 logins only and has no purpose on a system that is not attached to a network.
• B. The display manager is configured in the X11 configuration filexorg.conf.
• C. There is only one display manager X11Dm that must be started on all systems running X11.
• D. After system startup, the display manager handles the login of a user.
• E. Without a display manager, no graphical programs can be run.

Answer: D

Explanation:
Section: User Interfaces and Desktops

NEW QUESTION 16
FILL BLANK
The system's timezone may be set by linking /etc/localtime to an appropriate file in which directory? (Provide the full path to the directory, without any country information)

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:
/usr/share/zoneinfo/
Section: Administrative Tasks

NEW QUESTION 17
Which of the following commands can be used to limit the amount of memory a user may use?

• A. umask
• B. usermod
• C. ulimit
• D. passwd
• E. chage

Answer: C

Explanation:

Section: Security

NEW QUESTION 18
Which of the following actions prevents a specific user form scheduling tasks usingatorbatch?

• A. Add the specific user to the/etc/ at.allowfile.
• B. Add the specific user to the [deny] section in the/etc/std.conffile.
• C. Add the specific user to the/etc/at.denyfile.
• D. Add the specific user to thenojobsgroup.
• E. Runatd ––denyfollowed by the name of the specific user.

Answer: C

Explanation:
Section: Shells, Scripting and Data Management

NEW QUESTION 19
What is NOT contained in the locale setting of the operating system?

• A. currency symbol
• B. language
• C. timezone
• D. thousands separator

Answer: C

Explanation:
Section: Administrative Tasks

NEW QUESTION 20
FILL BLANK
Given the following line from/etc/nsswitch.conf:
hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4
By default, which file will be queried first for hostname lookups? (Specify the full name of the file, including path.)

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:
/etc/hosts
Section: Networking Fundamentals

NEW QUESTION 21
FILL BLANK
Which command, available with all MTAs, is used to list the contents of the MTA's mail queue? (Specify ONLY the command without any path or parameters.)

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:
mailq -or- /usr/bin/mailq -or- sendmail -bp -or- /usr/sbin/sendmail -bp -or- /usr/lib/sendmail - bp -or- sendmail -or-
/usr/sbin/sendmail -or- /usr/lib/sendmail
Section: Essential System Services

NEW QUESTION 22
Which of the following steps prevents a user from obtaining an interactive login session?

• A. Run the command chsh -s /bin/false with the user name.
• B. Set the UID for the user to 0.
• C. Remove the user from the group staff.
• D. Add the user to /etc/noaccess.
• E. Create a .nologin file in the user's home directory.

Answer: A

Explanation:
Section: Administrative Tasks

NEW QUESTION 23
What is the purpose of a screen reader?

• A. It reads text displayed on the screen to blind or visually impaired people.
• B. It reads the parameters of the attached monitors and creates an appropriate X11 configuration.
• C. It displays lines and markers to help people use speed reading techniques.
• D. It manages and displays files that contain e-books.

Answer: A

Explanation:
Section: User Interfaces and Desktops

NEW QUESTION 24
Which of the following programs uses the hosts.allow file to perform its main task of checking for access control restrictions to system services?

• A. tcpd
• B. inetd
• C. fingerd
• D. mountd
• E. xinetd

Answer: A

Explanation:
Section: Security

NEW QUESTION 25
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