Which of the following programs are web servers? (Choose two.)
A. Apache HTTPD
B. Postfix
C. Curl
D. Dovecot
E. NGINX
Correct Answer: A, E
Expert Rationale:
Web servers are software applications that process HTTP/HTTPS requests and deliver web
content to clients such as web browsers.
Apache HTTPD (Option A) is a widely used open-source web server that hosts websites and
serves web pages over HTTP and HTTPS protocols.
NGINX (Option E) is also a popular web server known for high performance, load balancing,
and reverse proxy capabilities.
Option B is incorrect because Postfix is a mail transfer agent (MTA) used for sending and
routing email, not hosting websites.
Option C is incorrect because Curl is a command-line tool used to transfer data using URLs and
various protocols; it is a client utility rather than a server.
Option D is incorrect because Dovecot is an email server application that provides IMAP and
POP3 services for receiving email.
DIF: Knowledge
REF: Linux Networking / Web Services
,OBJ: Identify common web server applications
TOP: System Services and Server Administration
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: A, E
Expert Rationale:
Hard disk drives (HDDs) use spinning magnetic platters and mechanical moving parts to read
and write data, whereas solid state drives (SSDs) use flash memory with no moving components.
Therefore, Option A is correct.
Solid state disks generally provide significantly faster data access, quicker boot times, and
improved application performance compared with traditional hard disks because SSDs do not
rely on mechanical movement. Therefore, Option E is correct.
Option B is incorrect because SSDs can still fail due to wear, electrical issues, or controller
malfunction, although they are less vulnerable to mechanical damage than HDDs.
Option C is incorrect because SSDs do not inherently store “many times” more data than HDDs.
In many cases, HDDs may offer larger storage capacities at lower cost.
Option D is incorrect because device names such as /dev/sda are used for both HDDs and SSDs
in Linux systems and do not indicate the storage type.
DIF: Knowledge
REF: Computer Hardware / Storage Devices
OBJ: Differentiate between HDD and SSD technologies
TOP: Hardware Components and Storage
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 mapping associates an IP address with a hostname using PTR (Pointer) records.
For IPv4 addresses, the octets are reversed and appended with .in-addr.arpa.
The IP address 198.51.100.165 is therefore represented as 165.100.51.198.in-addr.arpa,
making Option B correct.
Option A is incorrect because reverse DNS does not use A records. A records map hostnames to
IP addresses, not the reverse.
Options C, D, and E are incorrect because the record types and domain structures listed are not
valid standards used in DNS reverse lookups.
DIF: Application
REF: DNS Configuration / Reverse DNS
OBJ: Identify the structure of reverse DNS records
TOP: Network Services and Name Resolution
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:
The SATA (Serial ATA) bus is a hardware interface standard commonly used to connect hard
drives and solid state drives to a computer motherboard. SATA supports data transfer between
storage devices and the system.
Option A is incorrect because the RAM bus is used for communication between system memory
and the processor.
, Option B is incorrect because NUMA (Non-Uniform Memory Access) is a memory architecture
design rather than a storage connection bus.
Option C is incorrect because the CPU bus facilitates communication involving the processor
and not direct hard drive connectivity.
Option E is incorrect because there is no standard hardware interface known as the “Auto bus”
for storage devices.
DIF: Knowledge
REF: Computer Hardware / Storage Interfaces
OBJ: Identify motherboard interfaces used for storage devices
TOP: Hardware Architecture and Components
Members of a team already have experience using Red Hat Enterprise Linux. For a small
hobby project, the team wants to set up a Linux server without paying for a subscription.
Which of the following Linux distributions allows the team members to apply as much of
their Red Hat Enterprise Linux knowledge as possible?
A. Ubuntu Linux LTS
B. Raspbian
C. Debian GNU/Linux
D. CentOS
E. openSUSE
Correct Answer: D
Expert Rationale:
CentOS is a Linux distribution historically built from Red Hat Enterprise Linux (RHEL) source
packages and is designed to be highly compatible with RHEL environments. Team members
familiar with Red Hat Enterprise Linux can therefore apply nearly the same administration skills,
package management commands, filesystem structure, and service configuration methods when
using CentOS.
Options A and C are incorrect because Ubuntu and Debian are Debian-based distributions that
use different package management systems and administrative tools compared with RHEL.
Option B is incorrect because Raspbian is optimized for Raspberry Pi devices and is also
Debian-based.
Option E is incorrect because openSUSE uses different administration utilities and package
management systems that differ from Red Hat Enterprise Linux.
DIF: Knowledge
REF: Linux Distributions / Enterprise Linux
A. Apache HTTPD
B. Postfix
C. Curl
D. Dovecot
E. NGINX
Correct Answer: A, E
Expert Rationale:
Web servers are software applications that process HTTP/HTTPS requests and deliver web
content to clients such as web browsers.
Apache HTTPD (Option A) is a widely used open-source web server that hosts websites and
serves web pages over HTTP and HTTPS protocols.
NGINX (Option E) is also a popular web server known for high performance, load balancing,
and reverse proxy capabilities.
Option B is incorrect because Postfix is a mail transfer agent (MTA) used for sending and
routing email, not hosting websites.
Option C is incorrect because Curl is a command-line tool used to transfer data using URLs and
various protocols; it is a client utility rather than a server.
Option D is incorrect because Dovecot is an email server application that provides IMAP and
POP3 services for receiving email.
DIF: Knowledge
REF: Linux Networking / Web Services
,OBJ: Identify common web server applications
TOP: System Services and Server Administration
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: A, E
Expert Rationale:
Hard disk drives (HDDs) use spinning magnetic platters and mechanical moving parts to read
and write data, whereas solid state drives (SSDs) use flash memory with no moving components.
Therefore, Option A is correct.
Solid state disks generally provide significantly faster data access, quicker boot times, and
improved application performance compared with traditional hard disks because SSDs do not
rely on mechanical movement. Therefore, Option E is correct.
Option B is incorrect because SSDs can still fail due to wear, electrical issues, or controller
malfunction, although they are less vulnerable to mechanical damage than HDDs.
Option C is incorrect because SSDs do not inherently store “many times” more data than HDDs.
In many cases, HDDs may offer larger storage capacities at lower cost.
Option D is incorrect because device names such as /dev/sda are used for both HDDs and SSDs
in Linux systems and do not indicate the storage type.
DIF: Knowledge
REF: Computer Hardware / Storage Devices
OBJ: Differentiate between HDD and SSD technologies
TOP: Hardware Components and Storage
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 mapping associates an IP address with a hostname using PTR (Pointer) records.
For IPv4 addresses, the octets are reversed and appended with .in-addr.arpa.
The IP address 198.51.100.165 is therefore represented as 165.100.51.198.in-addr.arpa,
making Option B correct.
Option A is incorrect because reverse DNS does not use A records. A records map hostnames to
IP addresses, not the reverse.
Options C, D, and E are incorrect because the record types and domain structures listed are not
valid standards used in DNS reverse lookups.
DIF: Application
REF: DNS Configuration / Reverse DNS
OBJ: Identify the structure of reverse DNS records
TOP: Network Services and Name Resolution
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:
The SATA (Serial ATA) bus is a hardware interface standard commonly used to connect hard
drives and solid state drives to a computer motherboard. SATA supports data transfer between
storage devices and the system.
Option A is incorrect because the RAM bus is used for communication between system memory
and the processor.
, Option B is incorrect because NUMA (Non-Uniform Memory Access) is a memory architecture
design rather than a storage connection bus.
Option C is incorrect because the CPU bus facilitates communication involving the processor
and not direct hard drive connectivity.
Option E is incorrect because there is no standard hardware interface known as the “Auto bus”
for storage devices.
DIF: Knowledge
REF: Computer Hardware / Storage Interfaces
OBJ: Identify motherboard interfaces used for storage devices
TOP: Hardware Architecture and Components
Members of a team already have experience using Red Hat Enterprise Linux. For a small
hobby project, the team wants to set up a Linux server without paying for a subscription.
Which of the following Linux distributions allows the team members to apply as much of
their Red Hat Enterprise Linux knowledge as possible?
A. Ubuntu Linux LTS
B. Raspbian
C. Debian GNU/Linux
D. CentOS
E. openSUSE
Correct Answer: D
Expert Rationale:
CentOS is a Linux distribution historically built from Red Hat Enterprise Linux (RHEL) source
packages and is designed to be highly compatible with RHEL environments. Team members
familiar with Red Hat Enterprise Linux can therefore apply nearly the same administration skills,
package management commands, filesystem structure, and service configuration methods when
using CentOS.
Options A and C are incorrect because Ubuntu and Debian are Debian-based distributions that
use different package management systems and administrative tools compared with RHEL.
Option B is incorrect because Raspbian is optimized for Raspberry Pi devices and is also
Debian-based.
Option E is incorrect because openSUSE uses different administration utilities and package
management systems that differ from Red Hat Enterprise Linux.
DIF: Knowledge
REF: Linux Distributions / Enterprise Linux
