This 200-901 practice question tests your understanding of network fundamentals. 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.
An application developer is designing a microservice that communicates over HTTP. The service must guarantee that the request is processed exactly once. Which HTTP method should be used to ensure idempotency?
PUT
PUT is idempotent; repeating the request yields the same result.
PATCH
Why wrong: PATCH is not guaranteed to be idempotent.
GET
Why wrong: GET is idempotent but not suitable for submitting data.
DELETE
Why wrong: DELETE is idempotent but not for request processing.
POST
Why wrong: POST is not idempotent; duplicate requests may cause multiple creations.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
PUT
Idempotent methods like PUT, DELETE, GET, and HEAD can be retried without side effects. POST is not idempotent. The requirement 'exactly once' implies idempotency. PUT is the best choice for creating/updating resources.
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
For each option: why learners choose it and why it is or isn't the right answer here.
PUT
Why this is correct
PUT is idempotent; repeating the request yields the same result.
Related concept
Static NAT maps one inside address to one outside address.
PATCH
Why it's wrong here
PATCH is not guaranteed to be idempotent.
GET
Why it's wrong here
GET is idempotent but not suitable for submitting data.
DELETE
Why it's wrong here
DELETE is idempotent but not for request processing.
POST
Why it's wrong here
POST is not idempotent; duplicate requests may cause multiple creations.
Common exam traps
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
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.
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
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
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.
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FAQ
Network Fundamentals — This question tests Network Fundamentals — Static NAT maps one inside address to one outside address..
The correct answer is: PUT — Idempotent methods like PUT, DELETE, GET, and HEAD can be retried without side effects. POST is not idempotent. The requirement 'exactly once' implies idempotency. PUT is the best choice for creating/updating resources.
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.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 24, 2026
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