- A
Code reviews may be less effective because developers are reluctant to critique tested code
Why wrong: While there may be psychological factors, the main risk is inefficiency from late defect detection.
- B
Defects may be discovered later in the development lifecycle, increasing rework costs
Detecting defects later is more expensive and time-consuming.
- C
Unit tests may mask code quality issues
Why wrong: Unit tests verify functionality, not code quality or style.
- D
The code review process may overlook security vulnerabilities
Why wrong: Security vulnerabilities can be found at any stage; the timing of review does not directly impact effectiveness.
Question 519 of 1,000
Information Systems Acquisition, Development, and Implementation →mediumMultiple ChoiceObjective-mapped
CISA Practice Question: Information Systems Acquisition, Development, and Implementation
This CISA practice question tests your understanding of information systems acquisition, development, and implementation. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
During a system development project, the IS auditor notes that code reviews are performed only after the code is unit tested. Which of the following is the MOST significant risk associated with this practice?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Defects may be discovered later in the development lifecycle, increasing rework costs
Code reviews should be performed before unit testing to catch defects early. Delaying reviews until after testing may lead to rework if issues are found, increasing costs and time.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Code reviews may be less effective because developers are reluctant to critique tested code
Why it's wrong here
While there may be psychological factors, the main risk is inefficiency from late defect detection.
- ✓
Defects may be discovered later in the development lifecycle, increasing rework costs
Why this is correct
Detecting defects later is more expensive and time-consuming.
Related concept
CIDR notation defines the prefix length.
- ✗
Unit tests may mask code quality issues
Why it's wrong here
Unit tests verify functionality, not code quality or style.
- ✗
The code review process may overlook security vulnerabilities
Why it's wrong here
Security vulnerabilities can be found at any stage; the timing of review does not directly impact effectiveness.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related CISA subnetting questions on CIDR, address ranges, and subnet selection.
- →
Information Systems Acquisition, Development, and Implementation — study guide chapter
Learn the concepts, then practise the questions
- →
Information Systems Acquisition, Development, and Implementation practice questions
Targeted practice on this topic area only
- →
All CISA questions
1,000 questions across all exam domains
- →
Certified Information Systems Auditor CISA study guide
Full concept coverage aligned to exam objectives
- →
CISA practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related CISA practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Governance and Management of IT practice questions
Practise CISA questions linked to Governance and Management of IT.
Information Systems Acquisition, Development and Implementation practice questions
Practise CISA questions linked to Information Systems Acquisition, Development and Implementation.
Information Systems Operations and Business Resilience practice questions
Practise CISA questions linked to Information Systems Operations and Business Resilience.
Information System Auditing Process practice questions
Practise CISA questions linked to Information System Auditing Process.
Information Systems Acquisition, Development, and Implementation practice questions
Practise CISA questions linked to Information Systems Acquisition, Development, and Implementation.
Protection of Information Assets practice questions
Practise CISA questions linked to Protection of Information Assets.
CISA fundamentals practice questions
Practise CISA questions linked to CISA fundamentals.
CISA scenario practice questions
Practise CISA questions linked to CISA scenario.
CISA troubleshooting practice questions
Practise CISA questions linked to CISA troubleshooting.
Practice this exam
Start a free CISA practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this CISA question test?
Information Systems Acquisition, Development, and Implementation — This question tests Information Systems Acquisition, Development, and Implementation — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Defects may be discovered later in the development lifecycle, increasing rework costs — Code reviews should be performed before unit testing to catch defects early. Delaying reviews until after testing may lead to rework if issues are found, increasing costs and time.
What should I do if I get this CISA question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related CISA subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jul 4, 2026
This CISA practice question is part of Courseiva's free ISACA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CISA exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.