MS-900 Describe cloud concepts Practice Question
A cloud user can access their files from a work desktop, a personal laptop at home, and a mobile phone while traveling. Which essential characteristic of cloud computing does this scenario best illustrate?
⚠ Common exam trap
It's easy for candidates to confuse 'access from multiple devices' with 'on-demand self-service' because both involve user-initiated actions, but on-demand self-service specifically means provisioning resources without provider intervention, not multi-device connectivity.
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
✓
Broad network access
Broad network access is the correct answer because it describes the ability to access cloud resources from diverse client platforms (work desktop, personal laptop, mobile phone) over the network using standard protocols such as HTTPS, SSH, or VPN. This characteristic ensures that services are available from any location with internet connectivity, not just from a single device or network.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
On-demand self-service
Why it's wrong here
On-demand self-service refers to a consumer's ability to unilaterally provision computing capabilities—such as server time, storage, or applications—through a web portal or API without requiring human interaction with the provider. It addresses how resources are requested and managed, not how or from which endpoints they are subsequently accessed. Therefore, accessing files from multiple devices says nothing about automatic provisioning, making this choice incorrect.
- ✓
Broad network access
Why this is correct
Broad network access means cloud capabilities are available over the network through standard protocols and can be used by a diverse range of client platforms, including work desktops, laptops, tablets, and smartphones. The NIST definition of cloud computing highlights that access is via standard mechanisms, which is exactly the scenario in the question: a user can reach the same stored files from a work desktop and other network-connected devices. This is the distinguishing characteristic that makes this option correct.
- ✗
Resource pooling
Why it's wrong here
Resource pooling describes the provider's computing resources being aggregated in a multi-tenant model to serve many customers, with physical and virtual resources dynamically assigned and reassigned based on demand. The customer generally has no control or knowledge of the exact underlying resource location, such as which datacenter or server holds the data. It concerns shared infrastructure efficiency, not the range of devices a user can employ to access files, so it does not explain multi-device access from a work desktop.
- ✗
Rapid elasticity
Why it's wrong here
Rapid elasticity focuses on the ability to scale computing resources outward or inward dynamically—often automatically—so capacity can match fluctuating demand, such as adding more virtual machines during a traffic spike. Although this may give the appearance of unlimited resources, it has no relationship to where or from what type of device a user accesses files. The scenario of using a work desktop and other endpoints is about connectivity and client diversity, not about resource scaling, making this option incorrect.
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This MS-900 practice question is part of Courseiva's free Microsoft 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 MS-900 exam.