LPI 102-500 Exam Practice Test Instant Access

Question 1

What is Irue regarding the statement beginning with #. that is found in the first line of a script? (Choose TWO correct answers.)

AIt prevents the script from being executed until the, is removed

BIt triggers the installation of the script's interpreter.

CIt specifies the path and the arguments of the interpreter used to run the script.

DIt defines the character encoding of the script.

EIt is a comment that is ignored by the script interpreter.

Answer : B, C

Question 2

Of the ways listed, which is the best method to temporarily suspend a user's ability to interactively login?

AUse passwd -d username to give the user an empty password.

BUse chage to expire the user account.

CChange the user's password.

DAdd the command exit to the user's .login file.

Answer : B

The chage command can be used to change the expiration date of a user account. By setting the expiration date to a past date, the user account will be disabled and the user will not be able to login interactively. This is a temporary method, as the expiration date can be changed back to a future date or removed to re-enable the user account. The other options are either permanent, insecure, or ineffective. Option A is insecure, as it allows anyone to login as the user without a password. Option C is permanent, as it changes the user's password without saving the original one. Option D is ineffective, as it only affects the user's .login file, which is used by the csh and tcsh shells, and not by other shells such as bash or zsh. Therefore, option B is the best method to temporarily suspend a user's ability to interactively login.Reference: https://linuxconfig.org/disabling-user-logins-to-linux-system

https://askubuntu.com/questions/282806/how-to-enable-or-disable-a-user

Question 3

What is true about the ntpdate command?

AIt is the primary management command for the NTP time server.

BIt updates the local system's date (i.e. day, month and year) but not the time (i.e. hours, minutes, seconds).

CIt queries one or more NTP time servers and adjusts the system time accordingly.

DIt sends the local system time to one or many remote NTP time servers for redistribution.

EIt can be used by any user to set the user clock independently of the system clock.

Answer : C

The ntpdate command is a tool used to synchronize the system date and time with the NTP (Network Time Protocol) server(s) specified as arguments. It can be run manually as necessary to set the system clock, or it can be run from a cron script to periodically update the system clock. The ntpdate command has the following syntax:

ntpdate [options] server [server ...]

The ntpdate command obtains a number of samples from each server and applies a subset of the NTP clock filter and selection algorithms to select the best one. It then adjusts the system clock either by stepping it (if the offset is larger than 0.5 seconds) or by slewing it (if the offset is smaller than 0.5 seconds). The ntpdate command can also be used to query the date and time from a server without setting the system clock by using the -q option.

The other statements are false because:

It is not the primary management command for the NTP time server. The primary management command for the NTP time server is ntpd, which is a daemon that runs continuously and disciplines the system clock using sophisticated algorithms.

It updates both the local system's date and time, not just the date. The ntpdate command sets the system date and time according to the configured timezone information.

It does not send the local system time to any remote NTP time servers. The ntpdate command only queries the time from the servers and does not transmit any time information to them.

It cannot be used by any user to set the user clock independently of the system clock. The ntpdate command must be run as root on the local host and it affects the system clock for all users.

Linux ntpdate Command Tutorial -- LinuxTect

ntpdate - set the date and time via NTP

How to Use NTPDATE to Sync Time in Ubuntu Linux? -- TheITBros

Question 4

Which option in the chrony configuration file changes the initial interval of polls to a NTP server in order to speed up the initial synchronization?

Aiburst

Bquickstart

Cfast

DD. fsync

Eflood

Answer : A

The option in the chrony configuration file that changes the initial interval of polls to a NTP server in order to speed up the initial synchronization isiburst. The iburst option allows chronyd to send four requests to the server at intervals of 2 seconds or less, instead of the interval specified by the minpoll option, which is usually 64 seconds.This way, chronyd can make the first update of the clock shortly after start1.The iburst option is recommended for all servers, especially if the network connectivity is not reliable1.

The other options are not valid or do not have the same effect as iburst. The quickstart option does not exist in the chrony configuration file.The fast option is used to specify a fast initial correction of the system clock, but it does not change the polling interval1.The fsync option is used to enable or disable synchronization of the system clock to the real-time clock (RTC) every 11 minutes1.The flood option is used to enable a mode of operation where chronyd sends a burst of requests to the server at a high rate, which can be useful for testing or initial synchronization of a very inaccurate clock1.

LPI Linux Essentials: 1.4. Using sudo

LPI Linux Administrator: 102.5. Use Debian package management

LPI Linux Engineer: 201.1. Measure and Troubleshoot Resource Usage

LPI Linux Professional Certification Program

Question 5

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?

Afiles

Answer : A

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

Topic 6, Security

Question 6

Which of the following SQL statements will select the fields name and address from the contacts table?

ASELECT (name, address) FROM contacts;

BSELECT (name address) FROM contacts;

CSELECT name, address FROM contacts;

DSELECT name address FROM contacts;

Answer : C

The correct syntax for selecting specific columns from a table in SQL is to use the SELECT keyword followed by a comma-separated list of column names and then the FROM keyword followed by the table name. Therefore, the only option that follows this syntax is C. SELECT name, address FROM contacts; The other options are incorrect because they either use parentheses around the column names, which are not needed, or they omit the comma between the column names, which causes a syntax error.Reference: https://www.sqltutorial.org/sql-select/

https://www.w3schools.com/mysql/mysql_select.asp

Question 7

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)

Ausrsharezoneinfo

Answer : A

The /usr/share/zoneinfo directory contains the binary time zone files that are used by the system to determine the local time for any region. The files are organized in subdirectories by continent, country, or ocean. Some files represent the standard time zones, while others may have historical or political variations. To set the system's timezone, one can create a symbolic link from /etc/localtime to the appropriate file in the /usr/share/zoneinfo directory. For example, to set the timezone to America/New_York, one can use the command sudo ln -sf /usr/share/zoneinfo/America/New_York /etc/localtime. Alternatively, one can use the timedatectl command to set the timezone without creating the link manually.Reference:

How to Set or Change the Time Zone in Linux | Linuxize

4 Ways to Change the Timezone in Linux - wikiHow

LPIC-1 System Administrator Exam 102, Part 2 of 2, version 5.0 102-500 Exam Practice Test