200-901 Software Development and Design Practice Question
This 200-901 practice question tests your understanding of software development and design. 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.
In a microservices architecture, a REST API must support idempotent updates. Which HTTP method and design practice should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
PUT with the full resource representation
Option B is correct because PUT is inherently idempotent—making the same request multiple times results in the same resource state. Option A (POST) is not idempotent unless combined with a unique transaction ID, but this is not standard and can lead to complexity. Option C (PATCH) may be idempotent if using a conditional header like If-Match, but the method itself is not guaranteed idempotent. Option D (DELETE) is idempotent but not for updates. Therefore, PUT with the full resource representation is the best practice for idempotent updates.
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.
✓
PUT with the full resource representation
Why this is correct
PUT is idempotent by definition; replacing the entire resource ensures the same result regardless of request count.
Related concept
Static NAT maps one inside address to one outside address.
✗
POST with a unique transaction ID
Why it's wrong here
POST is not inherently idempotent; using a transaction ID can make it idempotent but adds complexity and is not a standard REST practice.
✗
DELETE with a resource version
Why it's wrong here
DELETE is idempotent but is used for deletion, not updates.
✗
PATCH with a conditional header
Why it's wrong here
PATCH can be idempotent with conditional headers, but the method itself is not guaranteed idempotent; it is not the standard approach.
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 200-901 NAT questions on configuration and troubleshooting.
Software Development and Design — This question tests Software Development and Design — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: PUT with the full resource representation — Option B is correct because PUT is inherently idempotent—making the same request multiple times results in the same resource state. Option A (POST) is not idempotent unless combined with a unique transaction ID, but this is not standard and can lead to complexity. Option C (PATCH) may be idempotent if using a conditional header like If-Match, but the method itself is not guaranteed idempotent. Option D (DELETE) is idempotent but not for updates. Therefore, PUT with the full resource representation is the best practice for idempotent updates.
What should I do if I get this 200-901 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 200-901 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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