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CLF-C02 Practice Question: Running their application on EC2 instances behind…
This CLF-C02 practice question tests your understanding of running their application on ec2 instances behind…. 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 is running their application on EC2 instances behind an Application Load Balancer. They want to ensure the application remains available during an AZ outage. What is the minimum architecture configuration required?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Multiple EC2 instances in a single Availability Zone
Multiple instances in a single AZ protects against individual instance failures but not against an AZ-wide outage — all instances fail simultaneously.
B
Best answer
EC2 instances distributed across at least two Availability Zones behind an ALB
Deploying instances across multiple AZs with an ALB spanning those AZs ensures that an outage in one AZ doesn't take down the application — traffic automatically routes to the surviving AZ.
C
Distractor review
A single large EC2 instance with enhanced networking
A single instance, regardless of size, is a single point of failure — any instance or AZ failure takes down the application.
D
Distractor review
EC2 instances in a single Region across multiple subnets in the same AZ
Multiple subnets within the same AZ don't provide AZ fault tolerance — they all fail if the AZ goes down.
Common exam trap
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Technical deep dive
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A developer needs to launch a test server for a new application prototype. The developer logs into the AWS Management Console, selects an Amazon EC2 instance type, configures the security group, and starts the instance. The instance is running within two minutes, and the developer did not need to submit a formal request to the company's IT procurement team or wait for approval from a cloud administrator. Which essential characteristic of cloud computing does this scenario best demonstrate?
Question 2
A solutions architect is planning a new web application on AWS. The workload will include 3 Amazon EC2 instances (t3.medium) running 24/7, an Application Load Balancer, and an Amazon RDS for MySQL db.t3.small database. The architect needs to estimate the monthly cost for the first year, considering different purchasing options (On-Demand, 1-year All Upfront Reserved Instance, and Compute Savings Plan). Which AWS tool should the architect use to create this estimate?
Question 3
A company's development team frequently needs temporary test environments. A developer can log into the AWS Management Console, select an Amazon EC2 instance type, configure storage, and launch the instance within minutes without any interaction with the IT infrastructure team. This capability is an example of which essential characteristic of cloud computing?
Question 4
A company's finance team needs to analyze AWS spending in detail. They require a report that includes hourly cost data for each AWS service, each individual resource (e.g., a specific EC2 instance), and any cost allocation tags applied. The team plans to export this data to an Amazon S3 bucket and then import it into a custom business intelligence (BI) analytics dashboard. Which AWS tool should the finance team use to generate this level of detailed cost data?
Question 5
A company uses AWS for its development environment. The finance team wants to set a monthly budget of $10,000. They want to receive an email notification when the actual costs reach 80% of the budget ($8,000) and again when costs exceed the budget. The team needs a managed AWS service that can automatically send these alerts without requiring custom code or third-party tools. Which AWS service should the team use?
Question 6
A company uses AWS Organizations to manage multiple accounts. The security team needs to enforce a policy that restricts SSH access (port 22) from the internet (0.0.0.0/0) in all VPCs across all accounts. The team wants to centrally define the allowed rules and automatically apply them to newly created VPCs and security groups, while also automatically remediating any existing non-compliant security groups. Which AWS service should the team use?
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: EC2 instances distributed across at least two Availability Zones behind an ALB — For AZ fault tolerance, EC2 instances must be distributed across at least two Availability Zones, with the ALB also configured across those AZs. If one AZ fails, the ALB routes all traffic to instances in the remaining AZ. Running multiple instances in a single AZ provides no protection against AZ-level failures.
What should I do if I get this CLF-C02 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related CLF-C02 subnetting questions on CIDR, address ranges, and subnet selection.
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