LFCS sample questions

Question 1

Given the following routing table: How would an outgoing packet to the destination 192.168.2.150 be handled?

Accepted Answer

It would be passed to the router 192.168.1.1 on ethO.

Answer

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

Answer

It would be directly transmitted on the device ethO.

Answer

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

Answer

It would be directly transmitted on the device wlanO.

Question 2

What is the effect of the egrep command when the -v option is used?

Accepted Answer

It only outputs non-matching lines.

Answer

It enables color to highlight matching parts.

Answer

It shows the command's version information.

Answer

It changes the output order showing the last matching line first.

Question 3

What is the difference between the commands test -e path and test -f path?

Accepted Answer

Both options check the existence of the path. The -f option also confirms that it is a regular file.

Answer

They are equivalent options with the same behavior.

Answer

The -f option tests for a regular file. The -e option tests for an empty file.

Answer

The -f option tests for a regular file. The -e option tests for an executable file.

Question 4

When running the command sed -e "s/a/b/" /tmp/file >/tmp/file While /tmp/file contains data, why is /tmp/file empty afterwards?

Accepted Answer

When the shell establishes the redirection it overwrites the target file before the redirected command starts and opens it for reading.

Answer

The file order is incorrect. The destination file must be mentioned before the command to ensure redirection.

Answer

The command sed did not match anything in that file therefore the output is empty.

Answer

Redirection for shell commands do not work using the > character. It only works using the | character instead.

Question 5

A script needs to process a list of files, but some filenames contain spaces. To handle this correctly, a while loop is used with read. Which of the following is the most robust way to pipe the output of find to this loop?

flowchart TD A[find /data -name '*.txt'] --> B{Pipe to Loop} B --> C[while read ...] C --> D[Process file]

Accepted Answer

find /data -name '*.txt' -print0 | while IFS= read -r -d '' filename; do ... done

Answer

find /data -name '*.txt' | while read filename; do ... done

Answer

for filename in $(find /data -name '*.txt'); do ... done

Answer

find /data -name '*.txt' | xargs -I {} sh -c '...'

Question 6

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

Accepted Answer

Start and prepare the desktop environment for the user.

Accepted Answer

Handle the login of a user.

Answer

Configure additional devices like new monitors or projectors when they are attached.

Answer

Lock the screen when the user was inactive for a configurable amount of time.

Answer

Create an X11 configuration file for the current graphic devices and monitors.

Question 7

Which of the following is a valid IPv6 address?

Accepted Answer

2001:db8:3241::1

Answer

2001::db8:4581::1

Answer

2001:db8:0g41::1

Answer

2001 %db8%9990%% 1

Answer

2001.db8.819f..1

Question 8

Which file inside the CUPS configuration directory contains the definition of the printers?

Accepted Answer

printers.conf

Answer

cups-devices.conf

Answer

snmp.conf

Answer

printcap.conf

Answer

cupsd.conf

Question 9

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

Accepted Answer

Output date and time in different formats.

Accepted Answer

Set the system clock.

Answer

Synchronize the hardware and system clocks.

Answer

Set the hardware clock.

Answer

Update the time via NTP.

Question 10

Which of the following commands can be used to display the inode number of a given file?

Accepted Answer

Is

Answer

inode

Answer

In

Answer

cp

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