Quick Answer
The answer is to enable HTTP/2 on the Application Load Balancer’s HTTPS listener. This is the simplest and most effective method because the ALB natively supports HTTP/2 at the listener level, allowing multiplexed streams and header compression to reduce latency without any changes to the backend EC2 instances. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of load balancer protocol optimizations versus more complex solutions like CloudFront or instance-level tuning. A common trap is assuming you need a Network Load Balancer or additional services, but ALB handles HTTP/2 directly on its secure listeners. Remember the memory tip: “ALB does HTTP/2 at the listener—no backend, no CloudFront, no NLB.”
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 running a web application on Amazon EC2 instances behind an Application Load Balancer. The application experiences high latency during peak hours. The company wants to improve performance by enabling HTTP/2. What is the simplest way to achieve this?
Configure the EC2 instances to support HTTP/2.
Why wrong: This does not address the load balancer latency.
Place an Amazon CloudFront distribution in front of the ALB and enable HTTP/2.
Why wrong: This adds complexity and cost.
Enable HTTP/2 on the Application Load Balancer's HTTPS listener.
ALB supports HTTP/2 directly.
Upgrade the load balancer to a Network Load Balancer.
Why wrong: NLB does not support HTTP/2.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Enable HTTP/2 on the Application Load Balancer's HTTPS listener.
Option B is correct because ALB natively supports HTTP/2 and can be enabled in the listener settings. Option A is wrong because upgrading to a Network Load Balancer does not support HTTP/2. Option C is wrong because CloudFront with HTTP/2 is more complex than directly enabling it on ALB. Option D is wrong because configuring EC2 instances directly does not improve latency at the load balancer level.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Configure the EC2 instances to support HTTP/2.
Why it's wrong here
This does not address the load balancer latency.
Place an Amazon CloudFront distribution in front of the ALB and enable HTTP/2.
Why it's wrong here
This adds complexity and cost.
Enable HTTP/2 on the Application Load Balancer's HTTPS listener.
Upgrade the load balancer to a Network Load Balancer.
Why it's wrong here
NLB does not support HTTP/2.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SAP-C02 NAT questions on configuration and troubleshooting.
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FAQ
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Static NAT maps one inside address to one outside address..
The correct answer is: Enable HTTP/2 on the Application Load Balancer's HTTPS listener. — Option B is correct because ALB natively supports HTTP/2 and can be enabled in the listener settings. Option A is wrong because upgrading to a Network Load Balancer does not support HTTP/2. Option C is wrong because CloudFront with HTTP/2 is more complex than directly enabling it on ALB. Option D is wrong because configuring EC2 instances directly does not improve latency at the load balancer level.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SAP-C02 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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