← SOA-C02·Amazon Web Services

Question 462 of 1,546

Reliability and Business Continuity →easyMultiple ChoiceObjective-mapped

First Step to Improve EC2 Availability: Multi-AZ Deployment

This SOA-C02 practice question tests your understanding of reliability and business continuity. 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 SysOps administrator is designing a disaster recovery plan for a web application. The application runs on EC2 instances in a single Availability Zone. What is the FIRST step to improve availability?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

A
Deploy EC2 instances in at least two Availability Zones.
Distributing instances across AZs ensures that if one AZ fails, traffic can be routed to healthy instances.
B
Use an Application Load Balancer to distribute traffic.
Why wrong: An ALB by itself does not provide high availability if all instances are in the same AZ.
C
Enable Multi-AZ for the RDS database.
Why wrong: This only protects the database layer, not the EC2 instances.
D
Create an Amazon CloudFront distribution for the application.
Why wrong: CloudFront caches content at edge locations but does not protect against compute failure in the origin.

Full breakdown with real-world context →

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

✓

Deploy EC2 instances in at least two Availability Zones.

The application currently runs on EC2 instances in a single Availability Zone, which creates a single point of failure. The first step to improve availability is to eliminate this zone-level failure by deploying EC2 instances in at least two Availability Zones, as this provides fault isolation against an AZ outage. This foundational change directly addresses the root cause of the availability risk before adding other components like load balancers or database replication.

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.

✓
Deploy EC2 instances in at least two Availability Zones.
Why this is correct
Distributing instances across AZs ensures that if one AZ fails, traffic can be routed to healthy instances.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use an Application Load Balancer to distribute traffic.
Why it's wrong here
An ALB by itself does not provide high availability if all instances are in the same AZ.
✗
Enable Multi-AZ for the RDS database.
Why it's wrong here
This only protects the database layer, not the EC2 instances.
✗
Create an Amazon CloudFront distribution for the application.
Why it's wrong here
CloudFront caches content at edge locations but does not protect against compute failure in the origin.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often jump to adding a load balancer or database redundancy first, overlooking that the most fundamental step to improve availability is to eliminate the single point of failure at the compute layer by distributing instances across multiple Availability Zones.

Detailed technical explanation

How to think about this question

Under the hood, an Availability Zone is a physically separate data center with independent power, cooling, and networking within an AWS Region. By deploying EC2 instances across at least two AZs, you achieve a Recovery Time Objective (RTO) and Recovery Point Objective (RPO) that can be measured in minutes or seconds using an Auto Scaling group and a load balancer, versus hours if rebuilding from snapshots after an AZ failure. In a real-world scenario, a single-AZ deployment can experience complete outage during events like a power failure or network partition in that AZ, whereas a multi-AZ architecture allows traffic to be automatically rerouted to the remaining healthy AZs.

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

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.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this SOA-C02 question test?

Reliability and Business Continuity — This question tests Reliability and Business Continuity — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Deploy EC2 instances in at least two Availability Zones. — The application currently runs on EC2 instances in a single Availability Zone, which creates a single point of failure. The first step to improve availability is to eliminate this zone-level failure by deploying EC2 instances in at least two Availability Zones, as this provides fault isolation against an AZ outage. This foundational change directly addresses the root cause of the availability risk before adding other components like load balancers or database replication.

What should I do if I get this SOA-C02 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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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