This 200-901 practice question tests your understanding of software development and design. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 developer is designing a REST API for managing network devices. The API should support idempotent operations for updating device configuration. Which HTTP method should be used for the update operation?
DELETE
Why wrong: DELETE is idempotent but used for removing resources, not updating.
PUT
PUT replaces the resource and is idempotent, making it suitable for updates.
PATCH
Why wrong: PATCH may not be idempotent depending on the operation semantics.
POST
Why wrong: POST is not idempotent; multiple requests may create multiple resources.
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
PUT is idempotent; making the same PUT request multiple times has the same effect as one request. PATCH is not necessarily idempotent. POST is not idempotent. DELETE is idempotent but not for 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
For each option: why learners choose it and why it is or isn't the right answer here.
DELETE
Why it's wrong here
DELETE is idempotent but used for removing resources, not updating.
PUT
Why this is correct
PUT replaces the resource and is idempotent, making it suitable for updates.
Related concept
Static NAT maps one inside address to one outside address.
PATCH
Why it's wrong here
PATCH may not be idempotent depending on the operation semantics.
POST
Why it's wrong here
POST is not idempotent; multiple requests may create multiple resources.
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
Software Development and Design — This question tests Software Development and Design — Static NAT maps one inside address to one outside address..
The correct answer is: PUT — PUT is idempotent; making the same PUT request multiple times has the same effect as one request. PATCH is not necessarily idempotent. POST is not idempotent. DELETE is idempotent but not for updates.
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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