Question 882 of 985

Describe cloud concepts →easyMultiple ChoiceObjective-mapped

MS-900 Describe cloud concepts Practice Question

This MS-900 practice question tests your understanding of describe cloud concepts. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 company uses a cloud service where administrators can add or remove virtual machine instances through a web portal without contacting the provider. The provider bills only for the exact resources consumed. Which cloud computing characteristic does this scenario best demonstrate?

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.

Question 1easymultiple choice

Full question →

A
Rapid elasticity
Why wrong: Rapid elasticity refers to the ability to scale resources up or down automatically. While the scenario mentions adding/removing VMs, the key aspect is self-provisioning without provider contact, not automatic scaling.
B
On-demand self-service
The ability to provision and de-provision VMs via a web portal without interacting with the provider exemplifies on-demand self-service. Combined with consumption-based billing, this is the primary characteristic demonstrated.
C
Measured service
Why wrong: Measured service is about metering and billing based on usage, which is present, but the scenario focuses on the self-provisioning capability. Measured service alone does not imply self-service.
D
Resource pooling
Why wrong: Resource pooling means the provider’s resources are shared among multiple customers. The scenario does not mention multi-tenancy or physical resource sharing.

Full breakdown with real-world context →

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

✓

On-demand self-service

On-demand self-service allows users to provision compute capabilities without requiring human interaction with the service provider. Measured service refers to metering resource usage; rapid elasticity is about scaling; resource pooling is about multi-tenancy. The combination of self-provisioning and usage-based billing points primarily to on-demand self-service.

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.

✗
Rapid elasticity
Why it's wrong here
Rapid elasticity refers to the ability to scale resources up or down automatically. While the scenario mentions adding/removing VMs, the key aspect is self-provisioning without provider contact, not automatic scaling.
✓
On-demand self-service
Why this is correct
The ability to provision and de-provision VMs via a web portal without interacting with the provider exemplifies on-demand self-service. Combined with consumption-based billing, this is the primary characteristic demonstrated.
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.
✗
Measured service
Why it's wrong here
Measured service is about metering and billing based on usage, which is present, but the scenario focuses on the self-provisioning capability. Measured service alone does not imply self-service.
✗
Resource pooling
Why it's wrong here
Resource pooling means the provider’s resources are shared among multiple customers. The scenario does not mention multi-tenancy or physical resource sharing.

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.

Trap categories for this question

Scenario analysis trap
Rapid elasticity refers to the ability to scale resources up or down automatically. While the scenario mentions adding/removing VMs, the key aspect is self-provisioning without provider contact, not automatic scaling.

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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.

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 MS-900 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this MS-900 question test?

Describe cloud concepts — This question tests Describe cloud concepts — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: On-demand self-service — On-demand self-service allows users to provision compute capabilities without requiring human interaction with the service provider. Measured service refers to metering resource usage; rapid elasticity is about scaling; resource pooling is about multi-tenancy. The combination of self-provisioning and usage-based billing points primarily to on-demand self-service.

What should I do if I get this MS-900 question wrong?

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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