- A
Switch to an agile methodology immediately and iterate on the fix without formal approval.
Why wrong: Switching methodologies mid-project is disruptive and may not be feasible; the team should follow the existing process.
- B
Submit a formal change request to the change control board to approve a redesign of the transaction module.
This follows the waterfall process and addresses the defect properly, even if it delays the project.
- C
Ignore the issue because only a few transactions exceed $10,000, and hope testers overlook it.
Why wrong: Ignoring a known critical defect is unethical and could lead to severe consequences.
- D
Continue with current implementation and patch the crash after release as a maintenance update.
Why wrong: A critical defect like a crash on large transactions could cause customer loss and legal issues; patching later is risky.
Quick Answer
The best course of action is to submit a formal change request to the change control board to approve a redesign of the transaction module. This is correct because the waterfall model change request process requires any deviation from the approved design—especially one discovered after implementation—to go through a structured review by a change control board, ensuring that schedule, cost, and quality impacts are formally evaluated before work begins. On the CompTIA ITF+ FC0-U61 exam, this scenario tests your understanding of how change control enforces the rigid, sequential nature of waterfall development, where late-stage fixes cannot be handled informally without risking scope creep or contractual penalties. A common trap is choosing to skip the board and fix the defect directly, but that violates the waterfall model change request process and exposes the team to liability for unauthorized work. Remember the mnemonic “CRB before CRASH”—always route critical defects through the Change Review Board before touching the code.
FC0-U61 Software Development Concepts Practice Question
This FC0-U61 practice question tests your understanding of software development concepts. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A software team is developing a mobile payment application using the waterfall model. They have completed the requirements, design, and implementation phases. During system testing, testers discover that the app crashes when processing transactions over $10,000. Further investigation reveals that the design specification for the transaction module did not account for large amounts, causing an overflow error. The project manager holds a meeting to decide the next steps. The team estimates that fixing the issue will require redesigning the transaction module, updating the code, and retesting, which will add two weeks to the schedule. The client's contract includes a penalty for late delivery but also a clause requiring the software to be free of critical defects. The team has already used most of the contingency time. What is the BEST course of action?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Submit a formal change request to the change control board to approve a redesign of the transaction module.
Submitting a formal change request follows the waterfall process and protects the team from blame, while addressing a critical defect.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Switch to an agile methodology immediately and iterate on the fix without formal approval.
Why it's wrong here
Switching methodologies mid-project is disruptive and may not be feasible; the team should follow the existing process.
- ✓
Submit a formal change request to the change control board to approve a redesign of the transaction module.
Why this is correct
This follows the waterfall process and addresses the defect properly, even if it delays the project.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Ignore the issue because only a few transactions exceed $10,000, and hope testers overlook it.
Why it's wrong here
Ignoring a known critical defect is unethical and could lead to severe consequences.
- ✗
Continue with current implementation and patch the crash after release as a maintenance update.
Why it's wrong here
A critical defect like a crash on large transactions could cause customer loss and legal issues; patching later is risky.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related FC0-U61 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this FC0-U61 question test?
Software Development Concepts — This question tests Software Development Concepts — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Submit a formal change request to the change control board to approve a redesign of the transaction module. — Submitting a formal change request follows the waterfall process and protects the team from blame, while addressing a critical defect.
What should I do if I get this FC0-U61 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related FC0-U61 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 24, 2026
This FC0-U61 practice question is part of Courseiva's free CompTIA 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 FC0-U61 exam.
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