The correct answer is horizontal auto-scaling for the web tier and a fixed database tier. This pattern works because the web tier is stateless, allowing identical server instances to be added or removed based on CPU utilization without disrupting session data, while the database tier remains fixed to preserve ACID properties and prevent consistency issues like split-brain or replication lag from concurrent writes. On the CCSP exam, this scenario tests your understanding of how to balance scalability with security controls, specifically the principle of separating stateless from stateful components to avoid data integrity risks. A common trap is assuming both tiers must scale together, but the exam emphasizes that fixed database tiers protect consistency in multi-tier application scaling. Remember the mnemonic: “Webs scale out, databases stay put.”
CCSP Cloud Concepts, Architecture and Design Practice Question
This CCSP practice question tests your understanding of cloud concepts, architecture and design. 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.
A company is designing a multi-tier application in the cloud. The web tier must automatically scale based on CPU utilization, while the database tier should remain fixed to maintain data consistency. Which architectural pattern best meets these requirements?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Horizontal auto-scaling for the web tier and a fixed database tier
Option A is correct because it separates the stateless web tier, which can safely scale horizontally using auto-scaling groups triggered by CPU utilization thresholds, from the stateful database tier, which must remain fixed to avoid consistency issues such as split-brain or replication lag. Horizontal scaling adds or removes identical web server instances without affecting session state, while a fixed database tier preserves ACID properties and prevents conflicts from concurrent writes across multiple database nodes.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Horizontal auto-scaling for the web tier and a fixed database tier
Why this is correct
This pattern separates stateless and stateful components appropriately.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Manual scaling for both tiers
Why it's wrong here
Manual scaling does not provide the required automatic response.
✗
Vertical scaling of all tiers
Why it's wrong here
Vertical scaling limits scalability and is less cost-effective.
✗
Single-tier architecture with auto-scaling
Why it's wrong here
Single-tier mixes concerns and complicates scaling.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the misconception that auto-scaling should apply uniformly to all tiers, but the trap here is that candidates forget the database tier requires stateful consistency and cannot scale horizontally without introducing eventual consistency or complex distributed transactions.
Detailed technical explanation
How to think about this question
Under the hood, horizontal auto-scaling for the web tier relies on a load balancer (e.g., AWS ALB or Azure Load Balancer) distributing traffic across instances in an auto-scaling group, with a scaling policy based on a CloudWatch metric like Average CPUUtilization > 70% for 5 minutes. The database tier remains fixed by using a single RDS instance or a static cluster with synchronous replication; if the database were auto-scaled, it would require sharding or distributed consensus protocols (e.g., Paxos or Raft) to maintain consistency, which adds complexity and latency. In a real-world scenario, a retail site might auto-scale web servers during Black Friday while keeping the database on a fixed, provisioned Aurora cluster to ensure inventory counts remain accurate.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Cloud Concepts, Architecture and Design — This question tests Cloud Concepts, Architecture and Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Horizontal auto-scaling for the web tier and a fixed database tier — Option A is correct because it separates the stateless web tier, which can safely scale horizontally using auto-scaling groups triggered by CPU utilization thresholds, from the stateful database tier, which must remain fixed to avoid consistency issues such as split-brain or replication lag. Horizontal scaling adds or removes identical web server instances without affecting session state, while a fixed database tier preserves ACID properties and prevents conflicts from concurrent writes across multiple database nodes.
What should I do if I get this CCSP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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?
Read the scenario before looking for a memorised answer.
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Question Discussion
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