- A
Use a Network Load Balancer (NLB) with a static IP address and Route 53 weighted routing to multiple NLBs.
Why wrong: Multiple NLBs with weighted routing adds DNS-based failover which is not instant and can cause client caching issues.
- B
Use a Network Load Balancer (NLB) with an Elastic IP per Availability Zone and front it with AWS Global Accelerator.
Global Accelerator provides two static IP addresses that act as a fixed entry point, routing traffic to the NLB endpoints in each AZ, offering high resilience and static IPs.
- C
Use a Network Load Balancer (NLB) with Elastic IP addresses attached to each subnet in each AZ.
Why wrong: NLB with Elastic IPs provides static IPs but if the NLB node fails, the Elastic IP must be remapped manually, reducing resilience.
- D
Use an Application Load Balancer (ALB) with AWS Global Accelerator.
Why wrong: ALB does not have static IPs; Global Accelerator provides static IPs but the ALB's IPs still change. This adds complexity without full static IP guarantee.
Quick Answer
The answer is to use a Network Load Balancer (NLB) with an Elastic IP per Availability Zone and front it with AWS Global Accelerator. This combination provides a static IP for the load balancer because Global Accelerator assigns two static Anycast IP addresses that remain fixed, while the NLB in each AZ uses its own Elastic IP to receive traffic, ensuring the ALB behind it is reachable via those stable endpoints. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of how to decouple IP stability from application-layer load balancing; a common trap is choosing an ALB with Global Accelerator alone, which does not give you static IPs for the ALB itself, only for the accelerator endpoints. Another pitfall is relying on Route 53 weighted records, which introduces DNS caching latency and manual failover complexity. Memory tip: think of Global Accelerator as the “front door” with fixed addresses, and the NLB’s Elastic IPs as the “room numbers” that never change, ensuring partners always have a single, resilient whitelist entry.
DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud 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 DevOps team is designing a highly available multi-tier application on AWS. The application runs on EC2 instances in an Auto Scaling group across two Availability Zones. The team uses an Application Load Balancer (ALB) to distribute traffic. The application requires the ALB to be accessible via a single, static IP address for whitelisting by third-party partners. What is the most resilient solution?
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
Use a Network Load Balancer (NLB) with an Elastic IP per Availability Zone and front it with AWS Global Accelerator.
Option D is correct because using a Network Load Balancer (NLB) with static IPs in each AZ, fronted by a Global Accelerator, provides static IP addresses while leveraging the NLB's high availability and Global Accelerator's resilience. Option A (NLB with Elastic IPs) is simpler but requires managing IP failover. Option B (ALB with Global Accelerator) does not give static IPs directly; Global Accelerator provides static IPs but ALB's IPs change. Option C (Route 53 weighted records) adds latency and complexity.
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.
- ✗
Use a Network Load Balancer (NLB) with a static IP address and Route 53 weighted routing to multiple NLBs.
Why it's wrong here
Multiple NLBs with weighted routing adds DNS-based failover which is not instant and can cause client caching issues.
- ✓
Use a Network Load Balancer (NLB) with an Elastic IP per Availability Zone and front it with AWS Global Accelerator.
- ✗
Use a Network Load Balancer (NLB) with Elastic IP addresses attached to each subnet in each AZ.
Why it's wrong here
NLB with Elastic IPs provides static IPs but if the NLB node fails, the Elastic IP must be remapped manually, reducing resilience.
- ✗
Use an Application Load Balancer (ALB) with AWS Global Accelerator.
Why it's wrong here
ALB does not have static IPs; Global Accelerator provides static IPs but the ALB's IPs still change. This adds complexity without full static IP guarantee.
Common exam traps
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
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 DOP-C02 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Use a Network Load Balancer (NLB) with an Elastic IP per Availability Zone and front it with AWS Global Accelerator. — Option D is correct because using a Network Load Balancer (NLB) with static IPs in each AZ, fronted by a Global Accelerator, provides static IP addresses while leveraging the NLB's high availability and Global Accelerator's resilience. Option A (NLB with Elastic IPs) is simpler but requires managing IP failover. Option B (ALB with Global Accelerator) does not give static IPs directly; Global Accelerator provides static IPs but ALB's IPs change. Option C (Route 53 weighted records) adds latency and complexity.
What should I do if I get this DOP-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 DOP-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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Last reviewed: Jun 20, 2026
This DOP-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 DOP-C02 exam.
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