The correct answer is enabling HTTP/2 on the Application Load Balancer and using Amazon CloudFront as a content delivery network. HTTP/2 reduces latency by allowing multiplexed streams over a single connection, eliminating head-of-line blocking and enabling faster resource loading for web clients. CloudFront further reduces latency by caching static and dynamic content at edge locations closer to users, minimizing round-trip time to the origin ALB. On the AWS Certified Developer Associate DVA-C02 exam, this question tests your understanding of application-layer performance optimization versus infrastructure scaling—a common trap is assuming larger instances or more subnets fix latency, when the real bottleneck is often network overhead and connection management. Remember the mnemonic “H2 to the Edge”: HTTP/2 handles multiplexing at the ALB, while CloudFront pushes content to the edge for geographic latency reduction.
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Which TWO actions can help reduce latency for a web application hosted on EC2 instances behind an Application Load Balancer? (Select TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Amazon CloudFront as a content delivery network.
Enabling HTTP/2 on the ALB reduces latency by multiplexing requests. Using a Content Delivery Network (CloudFront) caches content at edge locations, reducing latency for users. Option B is wrong because increasing instance size may not reduce latency, especially if the bottleneck is network or I/O. Option C is wrong because multiple subnets increase availability, not latency. Option E is wrong because disabling keep-alive increases latency by requiring new connections.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 EC2 instance size to a larger type.
Why it's wrong here
Larger instances may improve throughput but not necessarily reduce latency.
✓
Use Amazon CloudFront as a content delivery network.
Why this is correct
CloudFront caches content at edge locations, reducing latency.
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.
Detailed technical explanation
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.
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.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related DVA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Use Amazon CloudFront as a content delivery network. — Enabling HTTP/2 on the ALB reduces latency by multiplexing requests. Using a Content Delivery Network (CloudFront) caches content at edge locations, reducing latency for users. Option B is wrong because increasing instance size may not reduce latency, especially if the bottleneck is network or I/O. Option C is wrong because multiple subnets increase availability, not latency. Option E is wrong because disabling keep-alive increases latency by requiring new connections.
What should I do if I get this DVA-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 DVA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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