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Linux Foundation LFCS Linux Foundation Certified System Administrator Exam Practice Test

Demo: 39 questions
Total 260 questions
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Linux Foundation Certified System Administrator Questions and Answers

Question 1

Which of the following commands moves and resumes in the background the last stopped shell job?

Options:

A.

run

B.

bg

C.

fg

D.

back

Question 2

Which of the following commands preloads and manages keys that are used for automatic authentication while logging in to other machines using SSH?

Options:

A.

sshd

B.

ssh-agent

C.

ssh-keygen

D.

ssh-add

Question 3

The presence of what file will temporarily prevent all users except root from logging into the system? (Specify the full name of the file, including path.)

Options:

Question 4

Which of the following is observed and corrected by a NTP client?

Options:

A.

The skew in time between the system clock and the hardware clock.

B.

The skew in time between the system clock and the reference clock.

C.

Changes in the time zone of the current computer's location.

D.

Adjustments needed to support Daylight Saving Time.

Question 5

Which character, added to the end of a command, runs that command in the background as a child process of the current shell?

Options:

A.

!

B.

+

C.

&

D.

%

E.

#

Question 6

Which of the following file permissions belong to a symbolic link?

Options:

A.

-rwxrwxrwx

B.

+rwxrwxrwx

C.

lrwxrwxrwx

D.

srwxrwxrwx

Question 7

Which of the following commands changes the number of days before the ext3 filesystem on /dev/sda1 has to run through a full filesystem check while booting?

Options:

A.

tune2fs -d 200 /dev/sda1

B.

tune2fs -c 200 /dev/sda1

C.

tune2fs -i 200 /dev/sda1

D.

tune2fs -n 200/dev/sda1

E.

tune2fs --days 200 /dev/sda1

Question 8

Which of the following files, when existing, affect the behavior of the Bash shell? (Choose TWO correct answers.)

Options:

A.

~/.bashconf

B.

~/.bashrc

C.

~/.bashdefaults

D.

~/.bash_etc

E.

~/.bash_profile

Question 9

Which of the following commands prints all files and directories within the /tmp directory or its subdirectories which are also owned by the user root? (Choose TWO correct answers.)

Options:

A.

find /tmp -uid root -print

B.

find -path /tmp -uid root

C.

find /tmp -user root -print

D.

find/tmp -user root

E.

find -path /tmp -user root –print

Question 10

Which of the following fields can be found in the /etc/group file? (Choose THREE correct answers.)

Options:

A.

The list of users that belong to the group.

B.

The home directory of the group.

C.

The name of the group.

D.

The description of the group.

E.

The password of the group.

Question 11

Which of the following shell redirections will write standard output and standard error output to a file named filename?

Options:

A.

2>&1 >filename

B.

>filename 2>&1

C.

1>&2>filename

D.

>>filename

E.

1&2>filename

Question 12

Which of the following commands can be used to locate programs and their corresponding man pages and configuration files?

Options:

A.

dirname

B.

which

C.

basename

D.

query

E.

whereis

Question 13

Which of the following fields are available in both the global /etc/crontab file as well as in user-specific crontab files? (Select TWO correct answers)

Options:

A.

Year

B.

Minute

C.

Username

D.

Command

Question 14

Which of the following commands determines the type of a file by using a definition database file which contains information about all common file types?

Options:

A.

magic

B.

type

C.

file

D.

pmagic

E.

hash

Question 15

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

Options:

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

Question 16

Which of the following words is used to restrict the records that are returned from a SELECT SQL query based on a supplied criteria for the values in the records?

Options:

A.

CASE

B.

FROM

C.

WHERE

D.

IF

Question 17

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

Options:

A.

umask

B.

usermod

C.

ulimit

D.

passwd

E.

chage

Question 18

Which commands can be used to change a user's account aging information? (Choose THREE correct answers.)

Options:

A.

usermod

B.

passwd

C.

chattr

D.

chage

E.

chsh

Question 19

After modifying GNU GRUB's configuration file, which command must be run for the changes to take effect?

Options:

A.

kill -HUP $(pidof grub)

B.

grub-install

C.

grub

D.

No action is required

Question 20

Which of the following commands lists all currently installedpackages when using RPM package management?

Options:

A.

yum --query --all

B.

yum --list --installed

C.

rpm --query --all

D.

rpm --list –installed

Question 21

Which of the following commands will help identify a broken router between the local and the remote machine?

Options:

A.

ps

B.

netstat

C.

nslookup

D.

ifconfig

E.

traceroute

Question 22

Given the following routing table:

How would an outgoing packet to the destination 192.168.2.150 be handled?

Options:

A.

It would be passed to the default router 192.168.178.1 on wlan0.

B.

It would be directly transmitted on the device eth0.

C.

It would be passed to the default router 255.255.255.0 on eth0.

D.

It would be directly transmitted on the device wlan0.

E.

It would be passed to the router 192.168.1.1 on eth0.

Question 23

What is the maximum niceness value that a regular user can assign to a process with the nice command when executinga new process?

Options:

A.

9

B.

19

C.

49

D.

99

Question 24

How can the existing environment variable FOOBAR be suppressedfor the execution of the script./myscript only?

Options:

A.

unset -v FOOBAR;./myscript

B.

set -a FOOBAR="";./myscript

C.

env -u FOOBAR./myscript

D.

env -i FOOBAR./myscript

Question 25

Which command displays a list of allbackground tasks running in the current shell? (Specify ONLY the command without any path or parameters.)

Options:

Question 26

In a nested directory structure, which find command line option would be used to restrict the command to searching down a particular number of subdirectories?

Options:

A.

-dirmax

B.

-maxdepth

C.

-maxlevels

D.

-n

E.

-s

Question 27

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?

Options:

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 detection mechanism (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.

Question 28

What information can the lspci command display about the system hardware? (Choose THREE correct answers.)

Options:

A.

Device IRQ settings

B.

PCI bus speed

C.

System battery type

D.

Device vendor identification

E.

Ethernet MAC address

Question 29

Which configuration file would be edited to change default options for the OpenSSH server?

Options:

A.

/etc/ssh/sshd_config

B.

/etc/ssh/ssh

C.

/etc/ssh/server

D.

/etc/ssh/ssh_config

E.

/etc/ssh/ssh_server

Question 30

Which command will disable swapping on a device? (Specify ONLY the command without any path or parameters.)

Options:

Question 31

What is the purpose of the command mailq?

Options:

A.

It fetches new emails from a remote server using POP3 or IMAP.

B.

It is a multi-user mailing list manager.

C.

It is a proprietary tool contained only in the qmail MTA.

D.

It queries the mail queue of the local MTA.

E.

It is a command-line based tool for reading and writing emails.

Question 32

Which of the following are tasks handled by a display manager like XDM or KDM? (Choose TWO correct answers.)

Options:

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.

Question 33

On a Linux system with shadow passwords enabled, which file in the file system contains the password hashes of all local users? (Specify the full name of the file, including path.)

Options:

Question 34

Which of the following commands changes the ownership of file.txt to the user dan and the group staff?

Options:

A.

chown dan/staff file.txt

B.

chown dan:staff file.txt

C.

chown -u dan -g staff file.txt

D.

chown dan -g staff file.txt

Question 35

Each entry in a crontab must end with what character?

Options:

A.

Tab

B.

Space

C.

Backslash

D.

Newline

Question 36

Which of the following commands is used to rotate, compress, and mail system logs?

Options:

A.

rotatelog

B.

striplog

C.

syslogd --rotate

D.

logrotate

E.

logger

Question 37

Which of the following are commonly used Mail Transfer Agent (MTA) applications? (Choose THREE correct answers.)

Options:

A.

Postfix

B.

Procmail

C.

Sendmail

D.

Exim

E.

SMTPd

Question 38

Which type of filesystem is created by mkfs when it is executed with the block device name only and without any additional parameters?

Options:

A.

ext2

B.

ext3

C.

ext4

D.

XFS

E.

VFAT

Question 39

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

Options:

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.

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Demo: 39 questions
Total 260 questions
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