The correct answer is to implement a cell-based architecture where each microservice runs in isolated cells with independent data stores. This pattern directly reduces the failure blast radius by containing faults within a single cell, preventing cascading failures across the entire system. In a cell-based architecture, each cell operates as a self-contained unit with its own compute, networking, and data tier, so if one cell fails, other cells remain unaffected. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this concept tests your ability to design for fault isolation and resilience at scale, often appearing in scenarios where a shared database or single load balancer is presented as a trap. A common mistake is choosing Auto Scaling, which handles capacity but does not isolate failures. Remember the memory tip: “Cells keep chaos in jail”—each cell is a jail cell for failures, locking them away from the rest of your system.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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 migrating from a monolithic application to microservices on AWS. They need to reduce the blast radius of failures. Which architecture pattern should they implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a cell-based architecture where each microservice runs in isolated cells with independent data stores.
Option B is correct because adopting a cell-based architecture isolates failures to individual cells, reducing blast radius. Option A is wrong because a single shared database creates a single point of failure. Option C is wrong while Auto Scaling helps with capacity, it does not isolate failures. Option D is wrong because a single Application Load Balancer can still be a bottleneck.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Implement Auto Scaling groups for each microservice without separating data stores.
Why it's wrong here
Without data isolation, failures can propagate.
✓
Use a cell-based architecture where each microservice runs in isolated cells with independent data stores.
Why this is correct
Cell-based architecture isolates failures to one cell, reducing overall impact.
Related concept
Authentication checks who the user is.
✗
Route all traffic through a single Application Load Balancer to simplify management.
Why it's wrong here
A single ALB is a single point of failure.
✗
Deploy all microservices in a single Availability Zone with a shared database.
Why it's wrong here
A single AZ and shared database increase blast radius.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related SAP-C02 questions on access control and AAA configuration.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Use a cell-based architecture where each microservice runs in isolated cells with independent data stores. — Option B is correct because adopting a cell-based architecture isolates failures to individual cells, reducing blast radius. Option A is wrong because a single shared database creates a single point of failure. Option C is wrong while Auto Scaling helps with capacity, it does not isolate failures. Option D is wrong because a single Application Load Balancer can still be a bottleneck.
What should I do if I get this SAP-C02 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related SAP-C02 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This SAP-C02 practice question is part of Courseiva's free Amazon Web Services 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 SAP-C02 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.