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Resilient Cloud Solutions →mediumMultiple ChoiceObjective-mapped

DOP-C02 Resilient Cloud Solutions Practice Question

This DOP-C02 practice question tests your understanding of resilient cloud solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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?

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.

Full breakdown with real-world context →

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 B is correct because it combines a Network Load Balancer (NLB) with Elastic IPs per Availability Zone for static IP addresses, and AWS Global Accelerator provides static anycast IP addresses, improved performance via the AWS global network, and automatic failover across AZs, ensuring high resilience. Option A is incorrect because Route 53 weighted routing adds DNS-level failover latency and does not provide a single static IP. Option C is incorrect because attaching Elastic IPs to subnets is not a valid configuration; NLBs use Elastic IPs per AZ but need Global Accelerator for global static IPs and better resilience. Option D is incorrect because an ALB does not support Elastic IPs; its IPs can change, so Global Accelerator is needed for static IPs but the NLB combination is more resilient due to native static 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.

✗
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.
Why this is correct
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.
Related concept
CIDR notation defines the prefix length.
✗
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.

Visual reference

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 B is correct because it combines a Network Load Balancer (NLB) with Elastic IPs per Availability Zone for static IP addresses, and AWS Global Accelerator provides static anycast IP addresses, improved performance via the AWS global network, and automatic failover across AZs, ensuring high resilience. Option A is incorrect because Route 53 weighted routing adds DNS-level failover latency and does not provide a single static IP. Option C is incorrect because attaching Elastic IPs to subnets is not a valid configuration; NLBs use Elastic IPs per AZ but need Global Accelerator for global static IPs and better resilience. Option D is incorrect because an ALB does not support Elastic IPs; its IPs can change, so Global Accelerator is needed for static IPs but the NLB combination is more resilient due to native static IPs.

What should I do if I get this DOP-C02 question wrong?

What is the key concept behind this question?

CIDR notation defines the prefix length.

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