NETWORK AND SECURITY FOUNDATIONS WGU D315
OA COMPREHENSIVE PRACTICE EXAM LATEST
UPDATED 2026-2027 ACTUAL FINAL EXAM WITH ALL
POSSIBLE AND WELL ELABORATED 100 PRACTICE
QUESTIONS AND 100% CORRECT VERIFIED ANSWERS
FULLY SOLVED PLUS DETAILED RATIONALES
INCLUDING EXPERT ANSWER KEY (COMPLETE A+
SOLUTIONS) NEWLY UPDATED VERSION FULL
REVISED RATED A+ BRAND NEW!!!
Question 1
Which OSI layer is responsible for routing packets
across different networks?
A) Physical
B) Data Link
C) Network
D) Transport
Answer: C) Network
Rationale: The Network layer (Layer 3) handles
,logical addressing and routing decisions to forward
packets between different networks.
Question 2
What is the primary purpose of a firewall?
A) To encrypt data in transit
B) To filter incoming and outgoing traffic based on
security rules
C) To assign IP addresses to devices
D) To resolve domain names to IP addresses
Answer: B) To filter incoming and outgoing traffic
based on security rules
Rationale: Firewalls enforce access control policies
by examining packets and allowing or blocking
them according to predefined rules.
Question 3
Which protocol is used to automatically assign IP
addresses to devices on a network?
A) DNS
B) DHCP
C) ARP
D) ICMP
,Answer: B) DHCP
Rationale: Dynamic Host Configuration Protocol
(DHCP) automates IP address allocation, subnet
masks, and default gateway settings.
Question 4
What does the acronym CIA stand for in information
security?
A) Confidentiality, Integrity, Availability
B) Control, Intelligence, Authentication
C) Cryptography, Identity, Access
D) Compliance, Investigation, Auditing
Answer: A) Confidentiality, Integrity, Availability
Rationale: The CIA triad is the foundation of
security, ensuring data is kept secret, unaltered,
and accessible when needed.
Question 5
Which type of attack involves overwhelming a
server with traffic to make it unavailable?
A) Phishing
B) Man-in-the-middle
C) Denial of Service (DoS)
, D) Spoofing
Answer: C) Denial of Service (DoS)
Rationale: DoS attacks flood a target with
excessive requests, exhausting resources and
preventing legitimate users from accessing
services.
Question 6
At which OSI layer does the TCP protocol operate?
A) Application
B) Transport
C) Network
D) Data Link
Answer: B) Transport
Rationale: TCP is a Transport layer protocol that
provides reliable, connection-oriented data
delivery.
Question 7
What is the function of a subnet mask?
A) To translate domain names to IP addresses
B) To differentiate the network portion from the
host portion of an IP address
OA COMPREHENSIVE PRACTICE EXAM LATEST
UPDATED 2026-2027 ACTUAL FINAL EXAM WITH ALL
POSSIBLE AND WELL ELABORATED 100 PRACTICE
QUESTIONS AND 100% CORRECT VERIFIED ANSWERS
FULLY SOLVED PLUS DETAILED RATIONALES
INCLUDING EXPERT ANSWER KEY (COMPLETE A+
SOLUTIONS) NEWLY UPDATED VERSION FULL
REVISED RATED A+ BRAND NEW!!!
Question 1
Which OSI layer is responsible for routing packets
across different networks?
A) Physical
B) Data Link
C) Network
D) Transport
Answer: C) Network
Rationale: The Network layer (Layer 3) handles
,logical addressing and routing decisions to forward
packets between different networks.
Question 2
What is the primary purpose of a firewall?
A) To encrypt data in transit
B) To filter incoming and outgoing traffic based on
security rules
C) To assign IP addresses to devices
D) To resolve domain names to IP addresses
Answer: B) To filter incoming and outgoing traffic
based on security rules
Rationale: Firewalls enforce access control policies
by examining packets and allowing or blocking
them according to predefined rules.
Question 3
Which protocol is used to automatically assign IP
addresses to devices on a network?
A) DNS
B) DHCP
C) ARP
D) ICMP
,Answer: B) DHCP
Rationale: Dynamic Host Configuration Protocol
(DHCP) automates IP address allocation, subnet
masks, and default gateway settings.
Question 4
What does the acronym CIA stand for in information
security?
A) Confidentiality, Integrity, Availability
B) Control, Intelligence, Authentication
C) Cryptography, Identity, Access
D) Compliance, Investigation, Auditing
Answer: A) Confidentiality, Integrity, Availability
Rationale: The CIA triad is the foundation of
security, ensuring data is kept secret, unaltered,
and accessible when needed.
Question 5
Which type of attack involves overwhelming a
server with traffic to make it unavailable?
A) Phishing
B) Man-in-the-middle
C) Denial of Service (DoS)
, D) Spoofing
Answer: C) Denial of Service (DoS)
Rationale: DoS attacks flood a target with
excessive requests, exhausting resources and
preventing legitimate users from accessing
services.
Question 6
At which OSI layer does the TCP protocol operate?
A) Application
B) Transport
C) Network
D) Data Link
Answer: B) Transport
Rationale: TCP is a Transport layer protocol that
provides reliable, connection-oriented data
delivery.
Question 7
What is the function of a subnet mask?
A) To translate domain names to IP addresses
B) To differentiate the network portion from the
host portion of an IP address
