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Reliability and Business Continuity →hardMultiple ChoiceObjective-mapped

SOA-C02 Reliability and Business Continuity Practice Question

This SOA-C02 practice question tests your understanding of reliability and business continuity. 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.

A company has a production AWS account with multiple VPCs connected via a transit gateway. The security team requires that all cross-VPC traffic be inspected by a centralized network firewall appliance. The firewall is deployed in a dedicated inspection VPC. The SysOps administrator must ensure that traffic from VPC A to VPC B is routed through the inspection VPC. Which configuration achieves this?

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

✓

Configure the transit gateway route tables to propagate a blackhole route for VPC A and VPC B CIDRs to the inspection VPC attachment, then have the firewall forward traffic.

Option B is correct because transit gateway route tables can be configured to force all inter-VPC traffic through a centralized inspection VPC. By propagating a blackhole route for the CIDRs of VPC A and VPC B to the inspection VPC attachment, the transit gateway drops traffic that is not explicitly routed through the inspection VPC. The firewall in the inspection VPC then forwards the inspected traffic back to the transit gateway, which uses separate route tables to direct the traffic to the destination VPC. This ensures that all cross-VPC traffic is inspected without requiring VPC peering or NAT gateways.

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.

  • ✗

    Create a VPC peering connection between VPC A and VPC B, and use route tables to send traffic through the inspection VPC.

    Why it's wrong here

    VPC peering is direct and cannot be forced through a third VPC.

  • ✓

    Configure the transit gateway route tables to propagate a blackhole route for VPC A and VPC B CIDRs to the inspection VPC attachment, then have the firewall forward traffic.

    Why this is correct

    TGW route tables can force traffic through inspection VPC.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    Use security groups in the inspection VPC to filter traffic between VPC A and VPC B.

    Why it's wrong here

    Security groups are per-instance, not for routing.

  • ✗

    Attach a NAT gateway in the inspection VPC and configure route tables in VPC A and B to point to the NAT gateway.

    Why it's wrong here

    NAT gateway is for outbound internet, not cross-VPC.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often assume VPC peering or NAT gateways can be used for transitive routing or centralized inspection, but AWS explicitly disallows transitive routing through VPC peering, and NAT gateways are designed only for outbound internet traffic, not inter-VPC routing.

Detailed technical explanation

How to think about this question

Transit gateway route tables support route propagation and static routes, allowing you to create a hub-and-spoke topology where the inspection VPC acts as a central appliance. The blackhole route (a route with a target of 'blackhole') ensures that any traffic not explicitly routed through the inspection VPC is dropped, preventing accidental direct communication. The firewall appliance in the inspection VPC must perform asymmetric routing handling (e.g., using IP forwarding and source/destination check disabling) to properly forward traffic back to the transit gateway, which then uses separate route tables for each VPC attachment to deliver the traffic to the correct destination.

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 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.

Visual reference

Inside (Private) PC-A 10.0.0.1 PC-B 10.0.0.2 NAT Router Outside (Public) 203.0.113.1 Inside Global Server PAT: many private IPs share one public IP via unique port numbers

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this SOA-C02 question test?

Reliability and Business Continuity — This question tests Reliability and Business Continuity — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Configure the transit gateway route tables to propagate a blackhole route for VPC A and VPC B CIDRs to the inspection VPC attachment, then have the firewall forward traffic. — Option B is correct because transit gateway route tables can be configured to force all inter-VPC traffic through a centralized inspection VPC. By propagating a blackhole route for the CIDRs of VPC A and VPC B to the inspection VPC attachment, the transit gateway drops traffic that is not explicitly routed through the inspection VPC. The firewall in the inspection VPC then forwards the inspected traffic back to the transit gateway, which uses separate route tables to direct the traffic to the destination VPC. This ensures that all cross-VPC traffic is inspected without requiring VPC peering or NAT gateways.

What should I do if I get this SOA-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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This SOA-C02 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 SOA-C02 exam.