The correct answer is to deploy a NAT gateway in each Availability Zone and update the route tables. This improves outbound traffic reliability from ECS Fargate in private subnets by eliminating the single point of failure that a single NAT gateway creates; if that one gateway fails, all tasks lose internet access, causing the intermittent timeouts you see. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of high-availability design for outbound connectivity—a common trap is assuming one NAT gateway is sufficient because it works in a single-AZ lab, but production demands redundancy across AZs. Remember, Fargate tasks in private subnets rely entirely on the NAT path for external API calls, so a single gateway failure directly translates to application downtime. Memory tip: think “one NAT, one fail”—always pair a NAT gateway with each AZ’s route table to keep traffic flowing.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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 runs a containerized application on Amazon ECS with Fargate launch type. The application experiences intermittent timeouts when calling an external API. The ECS tasks are in a private subnet with a NAT gateway. How can the company improve the reliability of outbound traffic?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy a NAT gateway in each Availability Zone and update the route tables.
Option B is correct because a NATGateway in each AZ provides high availability; without it, a single NAT Gateway failure causes timeouts. Option A is wrong because it reduces security. Option C is wrong because it does not address NAT redundancy. Option D is wrong because it adds complexity without directly fixing NAT issues.
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.
✗
Place the tasks in a public subnet with auto-assign public IP.
Why it's wrong here
Reduces security and is not recommended for production.
✓
Deploy a NAT gateway in each Availability Zone and update the route tables.
Why this is correct
Eliminates single point of failure for outbound traffic.
Increase the NAT gateway's bandwidth by using a larger instance type.
Why it's wrong here
NATGateway is managed; no instance type selection.
✗
Use AWS Transit Gateway to route traffic through a central VPC.
Why it's wrong here
Transit Gateway is for connecting multiple networks, not for NAT redundancy.
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
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 SAP-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Deploy a NAT gateway in each Availability Zone and update the route tables. — Option B is correct because a NAT Gateway in each AZ provides high availability; without it, a single NAT Gateway failure causes timeouts. Option A is wrong because it reduces security. Option C is wrong because it does not address NAT redundancy. Option D is wrong because it adds complexity without directly fixing NAT issues.
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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Question Discussion
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