Quick Answer
The answer is AWS Network Firewall, as it is the only AWS-managed service purpose-built for centralized network inspection across hundreds of VPCs connected via Transit Gateway. By deploying AWS Network Firewall in a dedicated inspection VPC and routing all inter-VPC and egress traffic through it using Transit Gateway route tables, you create a single chokepoint where stateful and stateless rules can be enforced consistently. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of centralized inspection architectures versus distributed approaches like VPC security groups or NACLs; a common trap is choosing AWS WAF, which operates at the application layer (HTTP/S) and cannot inspect all IP traffic. The key distinction is that Network Firewall works at Layers 3 through 7 for any protocol, making it the correct choice for full traffic inspection. Memory tip: think "Network Firewall for network-wide firewall" — it’s the only service that gives you a central, managed firewall appliance in its own VPC.
This ANS-C01 practice question tests your understanding of network management and operations. 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 has a large AWS environment with hundreds of VPCs connected via Transit Gateway. They want to centrally manage network traffic flow and enforce security policies. Which service should they use to create a central network inspection architecture?
AWS WAF
Why wrong: AWS WAF is for web application layer, not network traffic inspection.
Security groups
Why wrong: Security groups are instance-level and not centralized.
AWS Network Firewall
Network Firewall is designed for centralized network inspection and can be integrated with Transit Gateway.
AWS Shield Advanced
Why wrong: Shield is for DDoS protection, not general network inspection.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
AWS Network Firewall
AWS Network Firewall provides managed firewall services that can be centrally deployed in a dedicated VPC and route traffic through it for inspection.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
AWS WAF
Why it's wrong here
AWS WAF is for web application layer, not network traffic inspection.
Security groups
Why it's wrong here
Security groups are instance-level and not centralized.
AWS Network Firewall
AWS Shield Advanced
Why it's wrong here
Shield is for DDoS protection, not general network inspection.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Network Management and Operations — This question tests Network Management and Operations — Read the scenario before looking for a memorised answer..
The correct answer is: AWS Network Firewall — AWS Network Firewall provides managed firewall services that can be centrally deployed in a dedicated VPC and route traffic through it for inspection.
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.
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