WGU D684 OBJECTIVE ASSESSMENT AND PRE-ASSESSMENT
LATEST 2025/2026 TEST BANK | D684 INTRODUCTION TO
COMPUTER SCIENCE OA AND PA EXAM WITH 550 REAL EXAM
QUESTIONS AND CORRECT VERIFIED ANSWERS | ALREADY
GRADED A+ (BRAND NEW!!)]
CORE DOMAINS
• Computational Thinking and Problem Solving
• Data Representation and Digital Logic
• Programming Fundamentals and Control Structures
• Algorithms and Data Structures
• Computer Architecture and Operating Systems
• Networking and the Internet
• Software Development Lifecycle and Methodologies
• Database Systems and Data Management
• Security, Ethics, and Professional Standards
• Emerging Technologies and Societal Impact
INTRODUCTION
This comprehensive examination is designed to evaluate the candidate's mastery
of foundational computer science concepts as outlined in the WGU D684
curriculum. It assesses knowledge of computational thinking, data representation,
programming fundamentals, algorithms, computer architecture, networking,
software development, databases, security, and the ethical implications of
computing. The exam employs multiple-choice and scenario-based questions to
test critical thinking, problem-solving, and the application of theoretical
knowledge to real-world scenarios. Emphasis is placed on decision-making,
,regulatory compliance, and professional standards. This assessment prepares
students for the Objective Assessment and Pre-Assessment, ensuring readiness for
advanced study and professional practice.
SECTION ONE: QUESTIONS 1–600
1. A software development team is creating a system to manage patient records
for a large hospital network. The system must ensure that only authorized
personnel can view sensitive patient data. Which of the following best describes
the principle that requires the system to verify a user's identity before granting
access to resources?
A. Authorization
B. Authentication
C. Accounting
D. Auditing
Correct answer: B
RATIONALE: Authentication is the process of verifying the identity of a user,
device, or system before granting access to resources. While authorization
determines what an authenticated user is allowed to do, authentication is the
prerequisite step that confirms the user's identity. Accounting tracks user
activities, and auditing reviews logs for compliance.
2. A programmer is writing a function that calculates the factorial of a non-
negative integer n. The function must handle the base case where n = 0,
returning 1. Which of the following control structures is most appropriate for
implementing this recursive calculation?
A. For loop
B. While loop
C. If-else statement
D. Switch statement
Correct answer: C
RATIONALE: A recursive function requires a base case to terminate the
,recursion. An if-else statement is the appropriate control structure to check if n
equals 0 and return 1; otherwise, return n multiplied by the factorial of n-1. Loops
are iterative, not recursive, and a switch statement is not suited for this type of
conditional check.
3. A network administrator is configuring a firewall to block unauthorized access
while allowing legitimate traffic. Which of the following is the primary purpose
of a firewall?
A. To encrypt data transmitted over the network
B. To monitor and control incoming and outgoing network traffic based on
predetermined security rules
C. To assign IP addresses to devices on the network
D. To translate domain names into IP addresses
Correct answer: B
RATIONALE: A firewall's primary function is to monitor and control network
traffic based on security rules, acting as a barrier between trusted and untrusted
networks. Encryption is handled by protocols like TLS/SSL, IP address assignment
is done by DHCP, and DNS resolves domain names.
4. A data analyst is working with a dataset containing missing values in several
columns. Which of the following techniques is most appropriate for handling
missing numerical data when the data is missing at random?
A. Listwise deletion
B. Mean imputation
C. Data augmentation
D. Outlier removal
Correct answer: B
RATIONALE: Mean imputation replaces missing numerical values with the
mean of the observed values in that column, preserving the sample size and
reducing bias when data is missing at random. Listwise deletion discards
incomplete rows, potentially introducing bias, while data augmentation and
outlier removal address different issues.
, 5. In object-oriented programming, a developer wants to create a new class that
inherits properties and methods from an existing class. Which of the following
terms best describes this relationship?
A. Encapsulation
B. Polymorphism
C. Inheritance
D. Abstraction
Correct answer: C
RATIONALE: Inheritance allows a new class (subclass) to inherit attributes and
behaviors from an existing class (superclass), promoting code reuse and
hierarchical organization. Encapsulation bundles data and methods,
polymorphism allows objects to take multiple forms, and abstraction hides
complex implementation details.
6. A user is browsing an e-commerce website and adds several items to a
shopping cart. The website stores a small text file on the user's computer to
remember the cart contents. What is this text file called?
A. Cache
B. Cookie
C. Session token
D. Local storage
Correct answer: B
RATIONALE: Cookies are small text files stored on a user's device by a web
browser to remember information such as shopping cart contents, login sessions,
and preferences. Cache stores web resources for faster loading, session tokens
manage authenticated sessions, and local storage is a more persistent browser-
based storage mechanism.
7. A systems analyst is evaluating the performance of a new database. The
analyst needs to measure the time it takes for a query to return results. Which
metric is most appropriate for this measurement?
A. Throughput
B. Latency
LATEST 2025/2026 TEST BANK | D684 INTRODUCTION TO
COMPUTER SCIENCE OA AND PA EXAM WITH 550 REAL EXAM
QUESTIONS AND CORRECT VERIFIED ANSWERS | ALREADY
GRADED A+ (BRAND NEW!!)]
CORE DOMAINS
• Computational Thinking and Problem Solving
• Data Representation and Digital Logic
• Programming Fundamentals and Control Structures
• Algorithms and Data Structures
• Computer Architecture and Operating Systems
• Networking and the Internet
• Software Development Lifecycle and Methodologies
• Database Systems and Data Management
• Security, Ethics, and Professional Standards
• Emerging Technologies and Societal Impact
INTRODUCTION
This comprehensive examination is designed to evaluate the candidate's mastery
of foundational computer science concepts as outlined in the WGU D684
curriculum. It assesses knowledge of computational thinking, data representation,
programming fundamentals, algorithms, computer architecture, networking,
software development, databases, security, and the ethical implications of
computing. The exam employs multiple-choice and scenario-based questions to
test critical thinking, problem-solving, and the application of theoretical
knowledge to real-world scenarios. Emphasis is placed on decision-making,
,regulatory compliance, and professional standards. This assessment prepares
students for the Objective Assessment and Pre-Assessment, ensuring readiness for
advanced study and professional practice.
SECTION ONE: QUESTIONS 1–600
1. A software development team is creating a system to manage patient records
for a large hospital network. The system must ensure that only authorized
personnel can view sensitive patient data. Which of the following best describes
the principle that requires the system to verify a user's identity before granting
access to resources?
A. Authorization
B. Authentication
C. Accounting
D. Auditing
Correct answer: B
RATIONALE: Authentication is the process of verifying the identity of a user,
device, or system before granting access to resources. While authorization
determines what an authenticated user is allowed to do, authentication is the
prerequisite step that confirms the user's identity. Accounting tracks user
activities, and auditing reviews logs for compliance.
2. A programmer is writing a function that calculates the factorial of a non-
negative integer n. The function must handle the base case where n = 0,
returning 1. Which of the following control structures is most appropriate for
implementing this recursive calculation?
A. For loop
B. While loop
C. If-else statement
D. Switch statement
Correct answer: C
RATIONALE: A recursive function requires a base case to terminate the
,recursion. An if-else statement is the appropriate control structure to check if n
equals 0 and return 1; otherwise, return n multiplied by the factorial of n-1. Loops
are iterative, not recursive, and a switch statement is not suited for this type of
conditional check.
3. A network administrator is configuring a firewall to block unauthorized access
while allowing legitimate traffic. Which of the following is the primary purpose
of a firewall?
A. To encrypt data transmitted over the network
B. To monitor and control incoming and outgoing network traffic based on
predetermined security rules
C. To assign IP addresses to devices on the network
D. To translate domain names into IP addresses
Correct answer: B
RATIONALE: A firewall's primary function is to monitor and control network
traffic based on security rules, acting as a barrier between trusted and untrusted
networks. Encryption is handled by protocols like TLS/SSL, IP address assignment
is done by DHCP, and DNS resolves domain names.
4. A data analyst is working with a dataset containing missing values in several
columns. Which of the following techniques is most appropriate for handling
missing numerical data when the data is missing at random?
A. Listwise deletion
B. Mean imputation
C. Data augmentation
D. Outlier removal
Correct answer: B
RATIONALE: Mean imputation replaces missing numerical values with the
mean of the observed values in that column, preserving the sample size and
reducing bias when data is missing at random. Listwise deletion discards
incomplete rows, potentially introducing bias, while data augmentation and
outlier removal address different issues.
, 5. In object-oriented programming, a developer wants to create a new class that
inherits properties and methods from an existing class. Which of the following
terms best describes this relationship?
A. Encapsulation
B. Polymorphism
C. Inheritance
D. Abstraction
Correct answer: C
RATIONALE: Inheritance allows a new class (subclass) to inherit attributes and
behaviors from an existing class (superclass), promoting code reuse and
hierarchical organization. Encapsulation bundles data and methods,
polymorphism allows objects to take multiple forms, and abstraction hides
complex implementation details.
6. A user is browsing an e-commerce website and adds several items to a
shopping cart. The website stores a small text file on the user's computer to
remember the cart contents. What is this text file called?
A. Cache
B. Cookie
C. Session token
D. Local storage
Correct answer: B
RATIONALE: Cookies are small text files stored on a user's device by a web
browser to remember information such as shopping cart contents, login sessions,
and preferences. Cache stores web resources for faster loading, session tokens
manage authenticated sessions, and local storage is a more persistent browser-
based storage mechanism.
7. A systems analyst is evaluating the performance of a new database. The
analyst needs to measure the time it takes for a query to return results. Which
metric is most appropriate for this measurement?
A. Throughput
B. Latency
