DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 runs a microservices architecture on Amazon ECS with Fargate. Services communicate via an internal Application Load Balancer. Recently, one service became unavailable due to a memory leak, causing cascading failures in downstream services. What design change would MOST effectively improve resilience and limit the blast radius?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement circuit breaker patterns in the service discovery and client libraries to stop calling unhealthy services.
Option C is correct because circuit breakers prevent cascading failures by stopping calls to unhealthy services. Option A is wrong because increasing task memory may delay but not prevent the failure. Option B is wrong while helpful for scaling, it does not prevent requests from being sent to failing services. Option D is wrong because connection draining only manages in-flight connections during deregistration, not cascading failures.
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.
✗
Increase the memory limit for each ECS task to accommodate memory leaks.
Why it's wrong here
This only masks the problem and does not prevent cascading failures.
✓
Implement circuit breaker patterns in the service discovery and client libraries to stop calling unhealthy services.
Why this is correct
Circuit breakers isolate failures and prevent cascading.
Related concept
Authentication checks who the user is.
✗
Enable connection draining on the ALB to allow in-flight requests to complete.
Why it's wrong here
Connection draining is for graceful shutdown, not for preventing cascading failures.
✗
Implement automatic scaling policies for ECS services based on memory utilization.
Why it's wrong here
Scaling cannot compensate for a memory leak that eventually consumes all resources.
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
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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 DOP-C02 questions on access control and AAA configuration.
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Implement circuit breaker patterns in the service discovery and client libraries to stop calling unhealthy services. — Option C is correct because circuit breakers prevent cascading failures by stopping calls to unhealthy services. Option A is wrong because increasing task memory may delay but not prevent the failure. Option B is wrong while helpful for scaling, it does not prevent requests from being sent to failing services. Option D is wrong because connection draining only manages in-flight connections during deregistration, not cascading failures.
What should I do if I get this DOP-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 DOP-C02 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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Question Discussion
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