Free Lpi 102-500 Practice Exams - Page 6 of 11

Question #51

Which of the following tasks can be accomplished using the command date? (Choose TWO correct answers.)

A . Synchronize the hardware and system clocks.
B . Output date and time in different formats.
C . Set the system clock.
D . Set the hardware clock.
E . Update the time via NTP.

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Question #52

What of the following can be done by the command ifconfig? (Choose TWO correct answers.)

A . Set a network interface active or inactive.
B . Specify the kernel module to be used with a network interface.
C . Allow regular users to change the network configuration of a network interface.
D . Change the netmask used on a network interface.
E . Specify which network services are available on a network interface.

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Question #53

Which of the following are valid host addresses for the subnet 203.0.113.64/28? (Choose TWO correct answers.)

A . 2030.113.64
B . 2030.113.78
C . 203.0.113.65
D . 203.0.113.80
E . 203.0.113.81

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Question #54

Which file, when using Sendmail or a similar MTA system, will allow a user to redirect all their mail to another address and is configurable by the user themselves?

A . /etc/alias
B . ~/.alias
C . /etc/mail/forwarders
D . ~/.forward
E . ~/.vacation

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Question #55

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

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Correct Answer: C
C

Explanation:

The ulimit command can be used to limit the amount of memory a user may use. The ulimit command is a shell builtin that allows the user to view or modify the resource limits imposed by the operating system. The resource limits can affect the maximum size of files, the maximum number of processes, the maximum amount of CPU time, and the maximum amount of virtual memory a user can access.

To limit the amount of memory a user may use, the -v option can be used with the ulimit command. The -v option sets the maximum amount of virtual memory available to the current shell and its children in kilobytes. For example, the command ulimit -v 1000000 would limit the virtual memory to 1 GB. The -m option can also be used to set the maximum resident set size, which is the amount of physical memory used by a process, but this option is not supported by all systems.

The ulimit command can be used interactively in a shell session, or it can be placed in a shell initialization file, such as .bashrc or .profile, to apply the limits to all future shell sessions. The ulimit command can also be used in conjunction with the /etc/security/limits.conf file, which allows the system administrator to set global or per-user resource limits for all users and processes. The /etc/security/limits.conf file can specify hard and soft limits for each resource, as well as the scope of the limit, such as user, group, or domain.

The other commands listed are not related to limiting the amount of memory a user may use. The umask command sets the default file permissions for newly created files and directories. The usermod command modifies the user account information, such as the home directory, the login shell, or the password expiration date. The passwd command changes the user password. The chage command changes the password aging information, such as the minimum and maximum number of days between password changes, or the number of days before the password expires.

Reference: ulimit(1) – Linux manual page

How to limit user environment with ulimit Linux command Control server access using hosts.allow and hosts.deny files

Question #56

Your senior administrator asked you to change the default background of his machine, which uses XDM.

Which file would you edit to achieve this?

A . /etc/X11/xdm/Xsetup
B . /etc/X11/xdm.conf
C . /etc/X11/xdm/Defaults
D . /etc/X11/defaults.conf

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Question #57

Which of the following parameters are used for journalctl to limit the time frame of the output? (Choose TWO correct answers.)

A . –from=
B . –since=
C . –until=
D . –upto=
E . –date=

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Question #58

What is the default name of the configuration file for the Xorg X11 server? (Specify the file name only without any path.)

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Question #59

Which of the following keywords can be used in the file /etc/resolv.conf? (Choose TWO correct answers.)

A . substitute
B . nameserver
C . search
D . lookup
E . method

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Question #60

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.

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