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24 multiple-choice questions and 17 flashcards on Core Architectural Components, about 10% of the Azure AZ-900 Fundamentals bank. Every one carries a written rationale.
Core Architectural Components is one of 7 chapters in CoStudy's Azure AZ-900 Fundamentals bank, and it holds 24 of the bank's 251 multiple-choice questions — roughly 10% of the total. That proportion is not arbitrary: chapters follow the certifying body's published exam outline, and the number of questions in each is set by that domain's published weight, so the share of your practice time this chapter takes matches the share of the real exam it accounts for.
Studying by chapter is worth doing once you have a diagnostic score. A single overall percentage tells you whether you are close; it does not tell you which domain is dragging. Working a weak chapter in isolation, and re-testing it in isolation, is the fastest way to move a score that has stalled — and it is why the mock exams in CoStudy report by domain rather than as one number.
3 questions drawn from this chapter, with the full rationale shown — the controlling principle behind the right answer, and why each wrong option tempts and fails.
Which statement about availability zones is accurate?
Answer: D — They are separated locations within a region with independent power
D) Correct — availability zones are physically separate locations inside a region, each with independent power, cooling and networking. A) That describes a geography containing multiple regions, not zones inside one. B) Logical containers for organising resources are resource groups. C) Zone support varies by region, so assuming universal availability is a common and costly mistake.
An Availability Zone is:
Answer: B — A physically separate data center within a region
A) A region contains one or more zones. B) Correct — AZs are physically distinct data centers (separate power, cooling, network) within a region. Supported regions have at least 3 AZs for high availability. C) Networking is separate. D) Not a backup concept.
What is a 'sovereign region' (e.g., Azure Government, Azure China)?
Answer: C — A physically isolated cloud built for sovereignty rules
C) Sovereign clouds are physically and logically isolated deployments that satisfy a jurisdiction's regulatory and data residency rules. A) Commercial public regions are the general-purpose offering. B) Regions are not shared across providers. D) Connectivity exists, but access boundaries are far stricter.
4 cards from the 17 in this chapter.
What is an Azure region?
A geographical area containing one or more datacenters that are networked together with low latency. You choose a region when deploying most resources, and the region determines latency to users, data residency and which services are available.
What is an Azure subscription, and what two boundaries does it provide?
A subscription is a logical container for resource groups that is tied to a billing account and a Microsoft Entra tenant. It provides a billing boundary (its own invoice and cost reporting) and an access-scale boundary (its own policies and quota limits).
What is a resource in Azure, and how does it relate to a resource group?
A resource is any manageable item you create — a virtual machine, a storage account, a virtual network. Every resource belongs to exactly one resource group, which is a logical container used for grouped deployment, management and deletion.
A workload must survive a single datacenter failure, and separately must survive the loss of an entire region. Which construct addresses each?
Availability zones address datacenter-level failure — spread instances across zones inside one region. Region pairs and cross-region replication address regional loss — replicate or fail over to a second region. Zones alone do not protect against a regional outage.
These are a sample. The full Core Architectural Components chapter runs 41 items with per-chapter progress tracking, on the web and in the iOS app.
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