- A
AWS Global Accelerator with Application Load Balancer
Why wrong: AWS Global Accelerator provides static IP addresses, but when combined with an Application Load Balancer, the ALB still uses a DNS name internally, adding complexity and cost. NLB with Elastic IPs is more straightforward and cost-effective for fixed IP whitelisting.
- B
Network Load Balancer (NLB) with Elastic IPs attached to each subnet
Network Load Balancer supports attaching Elastic IPs per subnet, providing static IP addresses for each AZ. This satisfies the fixed IP requirement and enables high availability across AZs.
- C
Classic Load Balancer with Elastic IPs
Why wrong: Classic Load Balancer does not support Elastic IPs per Availability Zone. It uses a DNS name and is not suitable for providing fixed IPs for whitelisting.
- D
Application Load Balancer (ALB) with EC2 instances
Why wrong: Application Load Balancer provides a DNS name, not static IP addresses. It cannot meet the fixed IP requirement needed for client whitelisting.
SAP-C02 Practice Question: Accelerate Workload Migration and Modernization
This SAP-C02 practice question tests your understanding of accelerate workload migration and modernization. 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.
A company is planning to migrate a legacy application to AWS. The application requires a fixed IP address that clients whitelist. The company wants to achieve high availability across two Availability Zones. Which architecture should they use?
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
Network Load Balancer (NLB) with Elastic IPs attached to each subnet
Option B (NLB with Elastic IPs) is correct because NLB supports static IP addresses via Elastic IPs attached per subnet, enabling fixed IP whitelisting across AZs. Option A (AWS Global Accelerator with ALB) provides two static IPs from Global Accelerator but adds complexity and cost; the ALB itself uses a DNS name. Option C (Classic Load Balancer) does not support Elastic IPs per AZ effectively, using a DNS name instead. Option D (ALB) provides only a DNS name, not fixed IPs.
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.
- ✗
AWS Global Accelerator with Application Load Balancer
Why it's wrong here
AWS Global Accelerator provides static IP addresses, but when combined with an Application Load Balancer, the ALB still uses a DNS name internally, adding complexity and cost. NLB with Elastic IPs is more straightforward and cost-effective for fixed IP whitelisting.
- ✓
Network Load Balancer (NLB) with Elastic IPs attached to each subnet
Why this is correct
Network Load Balancer supports attaching Elastic IPs per subnet, providing static IP addresses for each AZ. This satisfies the fixed IP requirement and enables high availability across AZs.
Related concept
CIDR notation defines the prefix length.
- ✗
Classic Load Balancer with Elastic IPs
Why it's wrong here
Classic Load Balancer does not support Elastic IPs per Availability Zone. It uses a DNS name and is not suitable for providing fixed IPs for whitelisting.
- ✗
Application Load Balancer (ALB) with EC2 instances
Why it's wrong here
Application Load Balancer provides a DNS name, not static IP addresses. It cannot meet the fixed IP requirement needed for client whitelisting.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Visual reference
Quick reference
IPv4 Address Class Summary
| Class | First Octet Range | Default Mask | Networks | Hosts per Network |
|---|---|---|---|---|
| A | 1–126 | /8 (255.0.0.0) | 126 | 16,777,214 |
| B | 128–191 | /16 (255.255.0.0) | 16,384 | 65,534 |
| C | 192–223 | /24 (255.255.255.0) | 2,097,152 | 254 |
| D | 224–239 | N/A | Multicast groups | — |
| E | 240–255 | N/A | Reserved / experimental | — |
127.x.x.x is reserved for loopback. Modern networks use CIDR (classless) rather than classful addressing.
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 SAP-C02 subnetting questions on CIDR, address ranges, and subnet selection.
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Accelerate Workload Migration and Modernization — study guide chapter
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
Accelerate Workload Migration and Modernization — This question tests Accelerate Workload Migration and Modernization — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Network Load Balancer (NLB) with Elastic IPs attached to each subnet — Option B (NLB with Elastic IPs) is correct because NLB supports static IP addresses via Elastic IPs attached per subnet, enabling fixed IP whitelisting across AZs. Option A (AWS Global Accelerator with ALB) provides two static IPs from Global Accelerator but adds complexity and cost; the ALB itself uses a DNS name. Option C (Classic Load Balancer) does not support Elastic IPs per AZ effectively, using a DNS name instead. Option D (ALB) provides only a DNS name, not fixed IPs.
What should I do if I get this SAP-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 SAP-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
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