- A
Configure security group egress rules to allow HTTPS to 0.0.0.0/0.
Why wrong: This allows all HTTPS traffic, not restricted to specific domains.
- B
Deploy an AWS Network Firewall in the VPC and configure domain filtering rules.
Network Firewall can filter outbound traffic by domain name with TLS inspection.
- C
Configure network ACL outbound rules to allow HTTPS to the IP addresses of the allowed domains.
Why wrong: IP addresses can change; NACL is stateless and harder to manage.
- D
Create a VPC endpoint for Amazon S3 and route traffic through it.
Why wrong: VPC endpoints are for AWS services, not filtering traffic to arbitrary domains.
Question 409 of 1,748
SCS-C02 Infrastructure Security Practice Question
This SCS-C02 practice question tests your understanding of infrastructure security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 security engineer needs to restrict outbound traffic from a VPC to only allow HTTPS traffic to specific domains (e.g., api.example.com). The VPC has a NAT gateway in a public subnet. What is the most secure way to implement this restriction?
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
✓
Deploy an AWS Network Firewall in the VPC and configure domain filtering rules.
AWS Network Firewall provides stateful, application-layer inspection that can filter outbound HTTPS traffic based on domain names (SNI/TLS hostnames), not just IP addresses. This allows you to restrict traffic to specific domains like api.example.com even if their IP addresses change, which is more secure and manageable than IP-based rules. Security groups and network ACLs cannot filter by domain name, and VPC endpoints are for specific AWS services, not general HTTPS domains.
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.
- ✗
Configure security group egress rules to allow HTTPS to 0.0.0.0/0.
Why it's wrong here
This allows all HTTPS traffic, not restricted to specific domains.
- ✓
Deploy an AWS Network Firewall in the VPC and configure domain filtering rules.
- ✗
Configure network ACL outbound rules to allow HTTPS to the IP addresses of the allowed domains.
Why it's wrong here
IP addresses can change; NACL is stateless and harder to manage.
- ✗
Create a VPC endpoint for Amazon S3 and route traffic through it.
Why it's wrong here
VPC endpoints are for AWS services, not filtering traffic to arbitrary domains.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume network ACLs or security groups can filter by domain name, but they operate only at Layers 3 and 4, whereas domain filtering requires Layer 7 inspection provided by AWS Network Firewall.
Detailed technical explanation
How to think about this question
AWS Network Firewall uses Suricata-compatible rules to inspect TLS handshake SNI fields and HTTP Host headers, enabling domain-based filtering even when traffic is encrypted. This is critical because many modern services use CDNs or load balancers with dynamic IP ranges, making IP-based ACLs ineffective. The firewall is deployed in a VPC with route tables directing outbound traffic through it, providing centralized control and logging.
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.
Visual reference
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this SCS-C02 question test?
Infrastructure Security — This question tests Infrastructure Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy an AWS Network Firewall in the VPC and configure domain filtering rules. — AWS Network Firewall provides stateful, application-layer inspection that can filter outbound HTTPS traffic based on domain names (SNI/TLS hostnames), not just IP addresses. This allows you to restrict traffic to specific domains like api.example.com even if their IP addresses change, which is more secure and manageable than IP-based rules. Security groups and network ACLs cannot filter by domain name, and VPC endpoints are for specific AWS services, not general HTTPS domains.
What should I do if I get this SCS-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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