DVA-C02 Practice Question: Elastic Beanstalk Rolling with additional batch
A developer is using AWS Elastic Beanstalk to deploy a web application. The application requires a highly available environment across multiple Availability Zones. The developer wants to update the application without any downtime while minimizing the number of new instances launched. Which deployment policy should the developer use?
⚠ Common exam trap
Candidates often confuse 'Rolling' with 'Rolling with additional batch', assuming both provide zero downtime, but only the latter guarantees full capacity throughout the update by adding an extra batch to absorb traffic.
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
✓
Rolling with additional batch
(Rolling with additional batch) is correct because it launches a new batch of instances before taking the old ones out of service, ensuring full capacity is maintained during the deployment. This provides high availability across multiple Availability Zones while minimizing the number of new instances compared to an immutable deployment, which would double the instance count. The additional batch absorbs the traffic during the rolling update, preventing any downtime.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
All at once
Why it's wrong here
All at once replaces every instance simultaneously, so the environment serves no traffic during the update, breaching the no-downtime requirement. It is tempting because it launches zero additional instances, and would be correct for development environments where brief outages are acceptable.
- ✗
Rolling
Why it's wrong here
Rolling updates instances in place in batches, reducing capacity during each batch, so the environment cannot guarantee full availability throughout. It is tempting because it adds no new instances, and would be correct when cost matters and brief reduced-capacity windows are tolerated.
- ✓
Rolling with additional batch
Why this is correct
Rolling with additional batch maintains full capacity by launching a new batch before terminating old instances, keeping the environment highly available across Availability Zones. It updates without downtime while launching fewer extra instances than immutable or blue/green.
- ✗
Immutable
Why it's wrong here
Immutable launches a full new set of instances before terminating the old ones, which conflicts with minimising the number of new instances launched. It is tempting because it delivers zero-downtime updates, and would be correct when rollback speed and safety outweigh instance cost.
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Same concept, more angles
1 more way this is tested on DVA-C02
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A developer is deploying a web application on AWS Elastic Beanstalk. The application needs to run on multiple instances behind a load balancer. Which deployment policy will cause the LEAST downtime?
easy- A.All at once
- B.Rolling
- ✓ C.Rolling with additional batch
- D.Immutable
Why C: Rolling with additional batch (C) is the correct deployment policy for minimizing downtime because it first launches a full new batch of instances in addition to the existing ones, then shifts traffic to the new instances before terminating the old ones. This ensures that the full capacity remains available throughout the deployment, unlike other policies that temporarily reduce capacity or require a full replacement.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DVA-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 DVA-C02 exam.