WGU C851 (Linux Foundations)- EXAM
LATEST 2026 ACTUAL EXAM WITH
COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS (100% VERIFIED
ANSWERS) |ALREADY GRADED A+|
||PROFESSOR VERIFIED||
||BRANDNEW!!!|| WITH RATIONALE
Which of the following programs are web servers? (Choose two.)
A. Apache HTTPD
B. Postfix
C. Curl
D. Dovecot
E. NGINX
Correct answer: AE
EXPERT RATIONALE
Web servers are software systems designed to handle HTTP/HTTPS
requests and deliver web content (such as HTML pages, images, and
APIs) to clients, typically web browsers. Among the options provided,
Apache HTTPD and NGINX are both widely used web server platforms.
Apache HTTPD is one of the most established open-source web servers
and is known for its flexibility and extensive module support for serving
,dynamic and static web content. NGINX is another high-performance
web server that is commonly used for handling high traffic loads,
reverse proxying, and load balancing while efficiently serving static and
dynamic web applications. In contrast, Postfix is a mail transfer agent
used for email routing, Dovecot is an IMAP/POP3 server used for email
retrieval, and Curl is a command-line tool used for transferring data
using various network protocols rather than serving web content.
Therefore, the correct answers are A (Apache HTTPD) and E (NGINX).
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.
Correct answer: AE
EXPERT RATIONALE
Hard disk drives (HDDs) and solid-state drives (SSDs) differ primarily in
their underlying storage technology and performance characteristics.
HDDs use mechanical components, including spinning magnetic platters
and a moving read/write head, which means they contain physical
moving parts. In contrast, SSDs use flash memory with no moving
components, making them more durable and less prone to mechanical
,failure. This makes option A correct, as it accurately distinguishes the
mechanical nature of HDDs versus the electronic architecture of SSDs.
Additionally, SSDs provide significantly faster data access speeds
compared to HDDs because they do not rely on mechanical movement,
allowing near-instant access to stored data. This makes option E correct.
Option B is incorrect because SSDs can still fail due to electronic or
firmware issues. Option C is incorrect because capacity varies widely
and HDDs often provide equal or larger storage capacities at lower cost.
Option D is incorrect because device naming conventions like /dev/sda
and /dev/sda-style identifiers do not inherently distinguish HDDs from
SSDs. Therefore, the correct answers are A and E.
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.
Correct answer: B
EXPERT RATIONALE
Reverse DNS is used to map an IP address back to a hostname, and this
is accomplished using a PTR (Pointer) record. Unlike forward DNS,
which maps domain names to IP addresses using A or AAAA records,
reverse DNS stores the reversed IP address within the special in-
, addr.arpa domain for IPv4 addresses. The IP address 198.51.100.165 is
reversed in octet order to become 165.100.51.198, and then appended
to the reverse DNS namespace, forming 165.100.51.198.in-addr.arpa.
This structure is then associated with a PTR record that points to the
corresponding hostname. Therefore, option B is correct, as it correctly
identifies both the PTR record type and the proper reverse DNS format
used to store the mapping.
Which of the following types of bus can connect hard disk drives with
the motherboard?
A. The RAM bus
B. The NUMA bus
C. The CPU bus
D. The SATA bus
E. The Auto bus
Correct answer: D
EXPERT RATIONALE
A bus in computer architecture refers to a communication system that
transfers data between components inside a computer. Hard disk drives
(HDDs) and solid-state drives (SSDs) connect to the motherboard using
specialized storage interfaces. Among these, the Serial ATA (SATA) bus
is the most common standard used to connect storage drives to the
motherboard, allowing high-speed data transfer between the drive and
system memory/processor. SATA replaced older standards like IDE/PATA
and is widely used for internal HDDs and SSDs in modern systems.
Therefore, option D is correct.
LATEST 2026 ACTUAL EXAM WITH
COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS (100% VERIFIED
ANSWERS) |ALREADY GRADED A+|
||PROFESSOR VERIFIED||
||BRANDNEW!!!|| WITH RATIONALE
Which of the following programs are web servers? (Choose two.)
A. Apache HTTPD
B. Postfix
C. Curl
D. Dovecot
E. NGINX
Correct answer: AE
EXPERT RATIONALE
Web servers are software systems designed to handle HTTP/HTTPS
requests and deliver web content (such as HTML pages, images, and
APIs) to clients, typically web browsers. Among the options provided,
Apache HTTPD and NGINX are both widely used web server platforms.
Apache HTTPD is one of the most established open-source web servers
and is known for its flexibility and extensive module support for serving
,dynamic and static web content. NGINX is another high-performance
web server that is commonly used for handling high traffic loads,
reverse proxying, and load balancing while efficiently serving static and
dynamic web applications. In contrast, Postfix is a mail transfer agent
used for email routing, Dovecot is an IMAP/POP3 server used for email
retrieval, and Curl is a command-line tool used for transferring data
using various network protocols rather than serving web content.
Therefore, the correct answers are A (Apache HTTPD) and E (NGINX).
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.
Correct answer: AE
EXPERT RATIONALE
Hard disk drives (HDDs) and solid-state drives (SSDs) differ primarily in
their underlying storage technology and performance characteristics.
HDDs use mechanical components, including spinning magnetic platters
and a moving read/write head, which means they contain physical
moving parts. In contrast, SSDs use flash memory with no moving
components, making them more durable and less prone to mechanical
,failure. This makes option A correct, as it accurately distinguishes the
mechanical nature of HDDs versus the electronic architecture of SSDs.
Additionally, SSDs provide significantly faster data access speeds
compared to HDDs because they do not rely on mechanical movement,
allowing near-instant access to stored data. This makes option E correct.
Option B is incorrect because SSDs can still fail due to electronic or
firmware issues. Option C is incorrect because capacity varies widely
and HDDs often provide equal or larger storage capacities at lower cost.
Option D is incorrect because device naming conventions like /dev/sda
and /dev/sda-style identifiers do not inherently distinguish HDDs from
SSDs. Therefore, the correct answers are A and E.
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.
Correct answer: B
EXPERT RATIONALE
Reverse DNS is used to map an IP address back to a hostname, and this
is accomplished using a PTR (Pointer) record. Unlike forward DNS,
which maps domain names to IP addresses using A or AAAA records,
reverse DNS stores the reversed IP address within the special in-
, addr.arpa domain for IPv4 addresses. The IP address 198.51.100.165 is
reversed in octet order to become 165.100.51.198, and then appended
to the reverse DNS namespace, forming 165.100.51.198.in-addr.arpa.
This structure is then associated with a PTR record that points to the
corresponding hostname. Therefore, option B is correct, as it correctly
identifies both the PTR record type and the proper reverse DNS format
used to store the mapping.
Which of the following types of bus can connect hard disk drives with
the motherboard?
A. The RAM bus
B. The NUMA bus
C. The CPU bus
D. The SATA bus
E. The Auto bus
Correct answer: D
EXPERT RATIONALE
A bus in computer architecture refers to a communication system that
transfers data between components inside a computer. Hard disk drives
(HDDs) and solid-state drives (SSDs) connect to the motherboard using
specialized storage interfaces. Among these, the Serial ATA (SATA) bus
is the most common standard used to connect storage drives to the
motherboard, allowing high-speed data transfer between the drive and
system memory/processor. SATA replaced older standards like IDE/PATA
and is widely used for internal HDDs and SSDs in modern systems.
Therefore, option D is correct.
