WGU C851 Linux Foundations OBJECTIVE
ASSESSMENT ACTUAL EXAM STUDY GUIDE
2025/2026 ACCURATE QUESTIONS AND
CORRECT DETAILED ANSWERS WITH
RATIONALES || 100% GUARANTEED PASS
<LATEST VERSION>
1. Graphical user interface (GUI) - ANSWER ✓ A method of human-computer
interaction characterized by a graphical display, a mouse to move a pointer
around the screen, and the ability to perform actions by pointing at objects
on the screen and clicking a mouse button.
2. Kernel - ANSWER ✓ The core of an operating system, which provides
multitasking (process creation, interprocess protection, interprocess
communication), memory management, and basic I/O management.
3. X server - ANSWER ✓ A program that implements X for a computer;
especially the component that interacts most directly with the video
hardware.
4. X.org-X11 - ANSWER ✓ In 2004, most Linux distributions shifted from
XFree86 to _____ because of licensing changes to XFree86. _____ 6.7.0
was based on XFree86 4.3.99, but it's developed independently up to the
current version, 7.7. Because _____ is based on XFree86, the two are
virtually identical in most important respects. One significant difference is
the name of the configuration file; another is the default location for fonts.
5. TiVo - ANSWER ✓ A popular digital video recorder (DVR) that uses a
Linux kernel and a significant number of standard support programs, along
with proprietary drivers and DVR software.
,6. Binaries - ANSWER ✓ Program files that are created by programmers for a
particular processor and kernel—for each OS.
7. libc - ANSWER ✓ A library of standard functions that are used by all C
programs.
8. UNetbootin - ANSWER ✓ A tool that can copy the files from a Linux
installation disc image file to a USB flash drive.
9. Parted Magic - ANSWER ✓ A Linux distribution for PCs that's intended for
emergency recovery operations.
10.Zettabyte File System (ZFS) - ANSWER ✓ A filesystem designed to ensure
that data stored on disks cannot be lost due to any physical error or
misprocessing by the hardware or operating system.
11.Free software - ANSWER ✓ Software that is distributed under a license,
such as the GPL, that permits copying and modification under liberal terms.
See also open source.
12.General Public License (GPL) - ANSWER ✓ A common free software
license, created and favored by the Free Software Foundation.
13.Firewall - ANSWER ✓ A firewall is a computer that restricts access to other
computers or software that runs on a single computer to protect it alone.
14.Internet Protocol (IP) - ANSWER ✓ An internet-layer protocol that's an
important part of the TCP/IP network stack because it handles data packet
exchange based on low-level addressing.
15.IPv6 - ANSWER ✓ The "next-generation" Internet Protocol. This upgrade
to TCP/IP allows for a theoretical maximum of approximately 3.4 _ 1038
addresses, as opposed to the 4 billion addresses possible with the older IPv4.
Although IPv4 addresses are still available in many regions in late 2012,
future growth of the Internet will depend upon IPv6.
16.NAT - ANSWER ✓ See Network Address Translation (NAT).
,17.Transmission Control Protocol/Internet Protocol (TCP/IP) - ANSWER ✓
The protocol suite developed by the Department of Defense (DoD) in
conjunction with the Internet. It was designed as an internetworking protocol
suite that could route information around network failures. Today it's the de
facto standard for communications on the Internet.
18.iwlist - ANSWER ✓ A command that identifies nearby Wi-Fi networks.
19.Which of the following programs are web servers? (Choose two.)
A. Apache HTTPD
B. Postfix
C. Curl
D. Dovecot
E. NGINX - ANSWER ✓ AE
20.What are the differences between hard disk drives and solid state disks?
(Choose two.)
A. Hard disks have a motor and moving parts, solid state disks do not.
B. Hard disks can fail due to physical damage, while solid state disks
cannot fail.
C. Solid state disks can store many times as much data as hard disk
drives.
D. /dev/sda is a hard disk device while /dev/ssda is a solid state disk.
E. Solid state disks provide faster access to stored data than hard disks. -
ANSWER ✓ AE
21.Reverse DNS assigns hostnames to IP addresses. How is the name of the IP
address 198.51.100.165 stored on a DNS server?
A. In the A record for 165.100.51.198.ipv4.arpa.
B. In the PTR record for 165.100.51.198.in-addr.arpa.
C. In the RNAME record for 198-51-100-165.rev.arpa.
D. In the ARPA record for 165.100.51.198.rev.
E. In the REV record for arpa.in-addr.198.51.100.165. - ANSWER ✓ B
22.Which of the following examples shows the general structure of a for loop in
a shell script?
A. for *.txt as file => echo $file
B. for *.txt ( echo $i )
, C. for file in *.txt do echo $i done
D. for ls *.txt exec {} \;
E. foreach @{file} { echo $i } - ANSWER ✓ C
23.Which operator in a regular expression matches the preceding character
either zero or one time?
A. ?
B. *
C. +
D. %
E. $ - ANSWER ✓ B
24.The file script.sh in the current directory contains the following
content:#!/bin/bashecho $MYVARThe following commands are used to
execute this script:MYVAR=value -./script.shThe result is an empty line
instead of the content of the variable MYVAR. How should MYVAR be set
in order to make script.sh display the content of MYVAR?
A. !MYVAR=value
B. env MYVAR=value
C. MYVAR=value
D. $MYVAR=value
E. export MYVAR=value - ANSWER ✓ E
25.What is the return value of a shell script after successful execution?
A. 1
B. 0
C. -1
D. -255
E. 255 - ANSWER ✓ B
26.Which of the following commands creates the ZIP archive poems.zip
containing all files in the current directory whose names end in .txt?
A. zip *.txt > poems.zip
B. zcat *.txt poems.zip
C. zip poems.zip *.txt
D. zip cfz poems.zip *.txt
E. cat *.txt | zip poems.zip - ANSWER ✓ C
ASSESSMENT ACTUAL EXAM STUDY GUIDE
2025/2026 ACCURATE QUESTIONS AND
CORRECT DETAILED ANSWERS WITH
RATIONALES || 100% GUARANTEED PASS
<LATEST VERSION>
1. Graphical user interface (GUI) - ANSWER ✓ A method of human-computer
interaction characterized by a graphical display, a mouse to move a pointer
around the screen, and the ability to perform actions by pointing at objects
on the screen and clicking a mouse button.
2. Kernel - ANSWER ✓ The core of an operating system, which provides
multitasking (process creation, interprocess protection, interprocess
communication), memory management, and basic I/O management.
3. X server - ANSWER ✓ A program that implements X for a computer;
especially the component that interacts most directly with the video
hardware.
4. X.org-X11 - ANSWER ✓ In 2004, most Linux distributions shifted from
XFree86 to _____ because of licensing changes to XFree86. _____ 6.7.0
was based on XFree86 4.3.99, but it's developed independently up to the
current version, 7.7. Because _____ is based on XFree86, the two are
virtually identical in most important respects. One significant difference is
the name of the configuration file; another is the default location for fonts.
5. TiVo - ANSWER ✓ A popular digital video recorder (DVR) that uses a
Linux kernel and a significant number of standard support programs, along
with proprietary drivers and DVR software.
,6. Binaries - ANSWER ✓ Program files that are created by programmers for a
particular processor and kernel—for each OS.
7. libc - ANSWER ✓ A library of standard functions that are used by all C
programs.
8. UNetbootin - ANSWER ✓ A tool that can copy the files from a Linux
installation disc image file to a USB flash drive.
9. Parted Magic - ANSWER ✓ A Linux distribution for PCs that's intended for
emergency recovery operations.
10.Zettabyte File System (ZFS) - ANSWER ✓ A filesystem designed to ensure
that data stored on disks cannot be lost due to any physical error or
misprocessing by the hardware or operating system.
11.Free software - ANSWER ✓ Software that is distributed under a license,
such as the GPL, that permits copying and modification under liberal terms.
See also open source.
12.General Public License (GPL) - ANSWER ✓ A common free software
license, created and favored by the Free Software Foundation.
13.Firewall - ANSWER ✓ A firewall is a computer that restricts access to other
computers or software that runs on a single computer to protect it alone.
14.Internet Protocol (IP) - ANSWER ✓ An internet-layer protocol that's an
important part of the TCP/IP network stack because it handles data packet
exchange based on low-level addressing.
15.IPv6 - ANSWER ✓ The "next-generation" Internet Protocol. This upgrade
to TCP/IP allows for a theoretical maximum of approximately 3.4 _ 1038
addresses, as opposed to the 4 billion addresses possible with the older IPv4.
Although IPv4 addresses are still available in many regions in late 2012,
future growth of the Internet will depend upon IPv6.
16.NAT - ANSWER ✓ See Network Address Translation (NAT).
,17.Transmission Control Protocol/Internet Protocol (TCP/IP) - ANSWER ✓
The protocol suite developed by the Department of Defense (DoD) in
conjunction with the Internet. It was designed as an internetworking protocol
suite that could route information around network failures. Today it's the de
facto standard for communications on the Internet.
18.iwlist - ANSWER ✓ A command that identifies nearby Wi-Fi networks.
19.Which of the following programs are web servers? (Choose two.)
A. Apache HTTPD
B. Postfix
C. Curl
D. Dovecot
E. NGINX - ANSWER ✓ AE
20.What are the differences between hard disk drives and solid state disks?
(Choose two.)
A. Hard disks have a motor and moving parts, solid state disks do not.
B. Hard disks can fail due to physical damage, while solid state disks
cannot fail.
C. Solid state disks can store many times as much data as hard disk
drives.
D. /dev/sda is a hard disk device while /dev/ssda is a solid state disk.
E. Solid state disks provide faster access to stored data than hard disks. -
ANSWER ✓ AE
21.Reverse DNS assigns hostnames to IP addresses. How is the name of the IP
address 198.51.100.165 stored on a DNS server?
A. In the A record for 165.100.51.198.ipv4.arpa.
B. In the PTR record for 165.100.51.198.in-addr.arpa.
C. In the RNAME record for 198-51-100-165.rev.arpa.
D. In the ARPA record for 165.100.51.198.rev.
E. In the REV record for arpa.in-addr.198.51.100.165. - ANSWER ✓ B
22.Which of the following examples shows the general structure of a for loop in
a shell script?
A. for *.txt as file => echo $file
B. for *.txt ( echo $i )
, C. for file in *.txt do echo $i done
D. for ls *.txt exec {} \;
E. foreach @{file} { echo $i } - ANSWER ✓ C
23.Which operator in a regular expression matches the preceding character
either zero or one time?
A. ?
B. *
C. +
D. %
E. $ - ANSWER ✓ B
24.The file script.sh in the current directory contains the following
content:#!/bin/bashecho $MYVARThe following commands are used to
execute this script:MYVAR=value -./script.shThe result is an empty line
instead of the content of the variable MYVAR. How should MYVAR be set
in order to make script.sh display the content of MYVAR?
A. !MYVAR=value
B. env MYVAR=value
C. MYVAR=value
D. $MYVAR=value
E. export MYVAR=value - ANSWER ✓ E
25.What is the return value of a shell script after successful execution?
A. 1
B. 0
C. -1
D. -255
E. 255 - ANSWER ✓ B
26.Which of the following commands creates the ZIP archive poems.zip
containing all files in the current directory whose names end in .txt?
A. zip *.txt > poems.zip
B. zcat *.txt poems.zip
C. zip poems.zip *.txt
D. zip cfz poems.zip *.txt
E. cat *.txt | zip poems.zip - ANSWER ✓ C
