The correct answers are that AWS Network Firewall supports stateful inspection using Suricata-compatible rule groups and can be deployed with AWS Transit Gateway for centralized inspection. Stateful inspection allows the firewall to track the state of network connections and apply rules based on traffic context, such as protocol and session flow, rather than examining packets in isolation. On the ANS-C01 exam, this concept tests your understanding of how to architect a centralized inspection VPC model, where all inter-VPC and outbound traffic is routed through a single firewall appliance using Transit Gateway route tables. A common trap is assuming Network Firewall can decrypt SSL/TLS traffic natively—it cannot, as that requires a separate proxy or gateway appliance. For the exam, remember the key pairing: stateful inspection equals Suricata rules, and centralized deployment equals Transit Gateway.
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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.
Which TWO statements are correct regarding the use of AWS Network Firewall? (Choose 2)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It supports stateful inspection using Suricata-compatible rules
Option B is correct because Network Firewall supports stateful inspection with Suricata rules. Option C is correct because it can be deployed in a centralized inspection VPC with Transit Gateway. Option A is wrong because it is deployed in a VPC, not as a separate service. Option D is wrong because it cannot be used without a VPC. Option E is wrong because it does not provide SSL/TLS decryption natively.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
It supports stateful inspection using Suricata-compatible rules
Why this is correct
Network Firewall uses Suricata for stateful inspection.
Related concept
Static NAT maps one inside address to one outside address.
✓
It can be used with AWS Transit Gateway for centralized inspection
Why this is correct
Transit Gateway can route traffic through a Network Firewall in a central VPC.
Related concept
Static NAT maps one inside address to one outside address.
✗
It can be used to inspect traffic between on-premises and AWS without a VPC
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: It supports stateful inspection using Suricata-compatible rules — Option B is correct because Network Firewall supports stateful inspection with Suricata rules. Option C is correct because it can be deployed in a centralized inspection VPC with Transit Gateway. Option A is wrong because it is deployed in a VPC, not as a separate service. Option D is wrong because it cannot be used without a VPC. Option E is wrong because it does not provide SSL/TLS decryption natively.
What should I do if I get this ANS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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