- A
Expose the NLB with an Internet Gateway route and restrict access using a security group attached to the NLB.
Why wrong: Security groups cannot be attached directly to NLBs for this purpose in the way implied, and exposing the service via the public internet violates the private-only requirement. PrivateLink is designed for private connectivity without relying on public exposure.
- B
Create a VPC endpoint (interface endpoint) in the consumer VPC that points to the service name published by the provider account, and limit allowed clients using the endpoint’s security group rules.
PrivateLink uses an interface VPC endpoint in the consumer VPC (using the provider’s published service name). Traffic stays on the AWS network, not the public internet. Security groups on the interface endpoint provide least-privilege control over which client resources can reach the endpoint, and the provider side can also restrict who can connect.
- C
Create an S3 Gateway endpoint in the consumer VPC and store the service hostname in SSM Parameter Store so clients can resolve privately.
Why wrong: S3 Gateway endpoints are unrelated to reaching an internal NLB-based application service. Using SSM for hostname resolution does not create private network connectivity to the service, nor does it implement PrivateLink.
- D
Use a bastion host in the provider VPC and allow the consumer VPC to SSH to it; from there, the consumer makes HTTP calls to the NLB.
Why wrong: Bastion hosts add operational burden and a new security boundary. PrivateLink is specifically meant to provide direct private connectivity to services without relying on SSH jumping. The described approach is more complex and less scalable.
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. 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.
Your company has an internal service hosted behind a Network Load Balancer (NLB) in VPC 10.0.0.0/16. A consumer team in a different VPC (10.1.0.0/16) must call the service without using the public internet. You want private connectivity using AWS PrivateLink. Which configuration best enables least-privilege access while keeping the traffic private?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"least"Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
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
Create a VPC endpoint (interface endpoint) in the consumer VPC that points to the service name published by the provider account, and limit allowed clients using the endpoint’s security group rules.
Option B is correct because AWS PrivateLink uses an interface VPC endpoint in the consumer VPC to connect privately to a Network Load Balancer (NLB) in the provider VPC, without traversing the public internet. The endpoint’s security group acts as a least-privilege firewall, allowing only specific clients (by source IP or security group) to access the service. This keeps traffic within the AWS network and avoids exposing the NLB to the internet.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Expose the NLB with an Internet Gateway route and restrict access using a security group attached to the NLB.
Why it's wrong here
Security groups cannot be attached directly to NLBs for this purpose in the way implied, and exposing the service via the public internet violates the private-only requirement. PrivateLink is designed for private connectivity without relying on public exposure.
When this WOULD be correct
If the question required public internet access to an Application Load Balancer (ALB) and asked for access restriction, an Internet Gateway with a security group attached to the ALB would be appropriate. For example: 'Allow external clients to access an ALB over the internet, but restrict access to a specific IP range.'
- ✓
Create a VPC endpoint (interface endpoint) in the consumer VPC that points to the service name published by the provider account, and limit allowed clients using the endpoint’s security group rules.
Why this is correct
PrivateLink uses an interface VPC endpoint in the consumer VPC (using the provider’s published service name). Traffic stays on the AWS network, not the public internet. Security groups on the interface endpoint provide least-privilege control over which client resources can reach the endpoint, and the provider side can also restrict who can connect.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create an S3 Gateway endpoint in the consumer VPC and store the service hostname in SSM Parameter Store so clients can resolve privately.
Why it's wrong here
S3 Gateway endpoints are unrelated to reaching an internal NLB-based application service. Using SSM for hostname resolution does not create private network connectivity to the service, nor does it implement PrivateLink.
When this WOULD be correct
This option would be correct if the question asked for private access to an S3 bucket from a consumer VPC, and the service hostname was stored in SSM Parameter Store for client configuration. For example: 'Your company needs to allow a consumer VPC to access an S3 bucket privately without using the internet.'
- ✗
Use a bastion host in the provider VPC and allow the consumer VPC to SSH to it; from there, the consumer makes HTTP calls to the NLB.
Why it's wrong here
Bastion hosts add operational burden and a new security boundary. PrivateLink is specifically meant to provide direct private connectivity to services without relying on SSH jumping. The described approach is more complex and less scalable.
When this WOULD be correct
A scenario where a consumer needs occasional, interactive access to a provider's internal resources (e.g., database administration) and the provider cannot expose a service via PrivateLink; a bastion host with strict security group rules and SSH key management would be appropriate.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SAA-C03 exam frequently reuses these exact scenarios with slightly different constraints.
✓Create a VPC endpoint (interface endpoint) in the consumer VPC that points to the service name published by the provider account, and limit allowed clients using the endpoint’s security group rules.Correct answer▾
Why this is correct
PrivateLink uses an interface VPC endpoint in the consumer VPC (using the provider’s published service name). Traffic stays on the AWS network, not the public internet. Security groups on the interface endpoint provide least-privilege control over which client resources can reach the endpoint, and the provider side can also restrict who can connect.
✗Expose the NLB with an Internet Gateway route and restrict access using a security group attached to the NLB.Wrong answer — click to see why▾
Why this is wrong here
NLBs do not support security groups; they rely on target group health checks and network ACLs. Additionally, routing through an Internet Gateway would expose the NLB to the public internet, violating the requirement for private connectivity.
★ When this WOULD be the correct answer
If the question required public internet access to an Application Load Balancer (ALB) and asked for access restriction, an Internet Gateway with a security group attached to the ALB would be appropriate. For example: 'Allow external clients to access an ALB over the internet, but restrict access to a specific IP range.'
Why candidates choose this
Candidates may mistakenly think security groups can be attached to any load balancer, and that an Internet Gateway is necessary for any cross-VPC communication, overlooking AWS PrivateLink as a private solution.
✗Create an S3 Gateway endpoint in the consumer VPC and store the service hostname in SSM Parameter Store so clients can resolve privately.Wrong answer — click to see why▾
Why this is wrong here
S3 Gateway endpoints only provide private access to S3 services, not to NLB-hosted services. They cannot route traffic to a Network Load Balancer or any non-S3 endpoint.
★ When this WOULD be the correct answer
This option would be correct if the question asked for private access to an S3 bucket from a consumer VPC, and the service hostname was stored in SSM Parameter Store for client configuration. For example: 'Your company needs to allow a consumer VPC to access an S3 bucket privately without using the internet.'
Why candidates choose this
Candidates may confuse 'Gateway Endpoint' with 'Interface Endpoint' or think that any VPC endpoint can provide private connectivity to any service, not realizing S3 Gateway endpoints are service-specific.
✗Use a bastion host in the provider VPC and allow the consumer VPC to SSH to it; from there, the consumer makes HTTP calls to the NLB.Wrong answer — click to see why▾
Why this is wrong here
Using a bastion host requires SSH access and does not provide private connectivity via AWS PrivateLink; it introduces a single point of failure, management overhead, and violates the least-privilege principle by granting broad network access.
★ When this WOULD be the correct answer
A scenario where a consumer needs occasional, interactive access to a provider's internal resources (e.g., database administration) and the provider cannot expose a service via PrivateLink; a bastion host with strict security group rules and SSH key management would be appropriate.
Why candidates choose this
Candidates may think a bastion host is a standard pattern for cross-VPC access and overlook that PrivateLink offers a more secure, managed, and scalable solution without requiring SSH or a jump box.
Analysis generated from the official SAA-C03blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Gateway Endpoints (which only work for S3 and DynamoDB) with Interface Endpoints (which support PrivateLink for services behind an NLB), leading them to pick Option C incorrectly.
Detailed technical explanation
How to think about this question
AWS PrivateLink uses an interface VPC endpoint powered by AWS PrivateLink, which creates an Elastic Network Interface (ENI) in the consumer VPC with a private IP address from the consumer’s subnet. The provider publishes a service name (e.g., com.amazonaws.vpce.<region>.<vpce-id>) that the consumer uses to create the endpoint; traffic is routed via the AWS backbone using VPC peering or Transit Gateway if needed, but the endpoint itself does not require peering. A subtle behavior is that the endpoint’s security group can reference the consumer’s security group as a source, enabling granular control without exposing the NLB’s IPs.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Secure Architectures — This question tests Design Secure Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a VPC endpoint (interface endpoint) in the consumer VPC that points to the service name published by the provider account, and limit allowed clients using the endpoint’s security group rules. — Option B is correct because AWS PrivateLink uses an interface VPC endpoint in the consumer VPC to connect privately to a Network Load Balancer (NLB) in the provider VPC, without traversing the public internet. The endpoint’s security group acts as a least-privilege firewall, allowing only specific clients (by source IP or security group) to access the service. This keeps traffic within the AWS network and avoids exposing the NLB to the internet.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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