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Question 226 of 1,705

Network Security, Compliance and Governance →hardMultiple SelectObjective-mapped

Quick Answer

The answer is to apply an SCP that denies the ec2:CreateInternetGateway action in all accounts except the central network account, combined with deploying a centralized egress VPC that hosts an internet gateway and firewall. This works because centralized egress VPC enforcement with SCP relies on using AWS Organizations to restrict resource creation—by blocking internet gateways in spoke accounts, you force all outbound traffic through the single, controlled egress point where inspection occurs. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of how SCPs act as a preventive guardrail for network architecture, often appearing as a distractor against options like Direct Connect or VPC endpoints, which serve private connectivity, not internet egress. A common trap is confusing SCPs with IAM policies or assuming a firewall alone enforces routing; remember, the SCP is the enforcement mechanism, not the inspection tool. Memory tip: “SCP stops the gate” to recall that the SCP blocks Internet Gateway creation in non-central accounts.

ANS-C01 Network Security, Compliance and Governance Practice Question

This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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 is designing a network security architecture for a multi-account environment using AWS Organizations. The security team needs to ensure that all internet-bound traffic from VPCs in the organization goes through a centralized egress VPC where it is inspected by a firewall. Which TWO steps are required to enforce this?

Question 1hardmulti select

Full question →

A
Create a central egress VPC with an Internet Gateway and a NAT Gateway or firewall.
Central egress VPC hosts the internet gateway.
B
Use AWS WAF to block internet access from all VPCs except the central egress VPC.
Why wrong: WAF is for web ACLs, not egress enforcement.
C
Set up an AWS Direct Connect connection to route internet traffic through the central VPC.
Why wrong: Direct Connect is for private connectivity, not internet.
D
Configure VPC endpoints for all AWS services to force traffic through the central VPC.
Why wrong: VPC endpoints are for AWS services, not internet traffic.
E
Apply an SCP that denies the ec2:CreateInternetGateway action in all accounts except the central network account.
SCP prevents creation of internet gateways in other accounts.

Full breakdown with real-world context →

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 central egress VPC with an Internet Gateway and a NAT Gateway or firewall.

Options A and D are correct. Option A: A central egress VPC with an internet gateway is required. Option D: A service control policy (SCP) can prevent creation of internet gateways in other accounts. Option B is wrong because Direct Connect is for private connectivity, not internet. Option C is wrong because VPC endpoints are for private access to AWS services. Option E is wrong because AWS WAF is for web ACLs, not egress enforcement.

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.

✓
Create a central egress VPC with an Internet Gateway and a NAT Gateway or firewall.
Why this is correct
Central egress VPC hosts the internet gateway.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use AWS WAF to block internet access from all VPCs except the central egress VPC.
Why it's wrong here
WAF is for web ACLs, not egress enforcement.
✗
Set up an AWS Direct Connect connection to route internet traffic through the central VPC.
Why it's wrong here
Direct Connect is for private connectivity, not internet.
✗
Configure VPC endpoints for all AWS services to force traffic through the central VPC.
Why it's wrong here
VPC endpoints are for AWS services, not internet traffic.
✓
Apply an SCP that denies the ec2:CreateInternetGateway action in all accounts except the central network account.
Why this is correct
SCP prevents creation of internet gateways in other accounts.
Related concept
Static NAT maps one inside address to one outside address.

Common exam traps

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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.

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.

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FAQ

Questions learners often ask

What does this ANS-C01 question test?

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: Create a central egress VPC with an Internet Gateway and a NAT Gateway or firewall. — Options A and D are correct. Option A: A central egress VPC with an internet gateway is required. Option D: A service control policy (SCP) can prevent creation of internet gateways in other accounts. Option B is wrong because Direct Connect is for private connectivity, not internet. Option C is wrong because VPC endpoints are for private access to AWS services. Option E is wrong because AWS WAF is for web ACLs, not egress enforcement.

What should I do if I get this ANS-C01 question wrong?

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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