- A
VPC Peering with route table customization
Why wrong: VPC Peering for hub-and-spoke works at small scale but doesn't scale well — each spoke needs a peering connection to the hub, and adding routes between many spokes becomes complex.
- B
AWS Transit Gateway with route tables
Transit Gateway supports multiple route tables that control which VPCs can communicate with which. Spoke VPCs route only to the hub's route table, isolating them from each other while allowing shared services access.
- C
Internet Gateway with security groups
Why wrong: Internet Gateways provide internet access — they don't route traffic between VPCs.
- D
VPC Endpoints
Why wrong: VPC Endpoints provide private access to AWS services without going through the internet — they don't route traffic between customer VPCs.
Quick Answer
The answer is AWS Transit Gateway with route tables. This is the correct choice because Transit Gateway acts as a central hub in a hub-and-spoke VPC architecture, allowing you to connect multiple VPCs to a shared services VPC while using separate route tables to control traffic flow. By configuring the route tables to only propagate routes to and from the shared services VPC, you enable centralized connectivity for DNS, monitoring, and security tools while preventing any direct communication between the spoke VPCs, enforcing the desired isolation. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your understanding of how Transit Gateway solves complex VPC peering challenges without requiring a full mesh of connections. A common trap is choosing VPC peering, which creates point-to-point links and cannot enforce spoke isolation without cumbersome manual routing. Remember the memory tip: "Transit Gateway is the hub that lets spokes talk to center, but not to each other—think of a wagon wheel where only the hub connects the spokes."
CLF-C02 Cloud Technology and Services Practice Question
This CLF-C02 practice question tests your understanding of cloud technology and services. 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 wants to implement a hub-and-spoke network architecture where multiple VPCs can communicate with a shared services VPC (containing DNS, monitoring, and security tools) but not with each other. Which AWS networking feature enables 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
AWS Transit Gateway with route tables
AWS Transit Gateway with route tables is the correct choice because it acts as a central hub that connects multiple VPCs (spokes) to a shared services VPC, while using separate route tables to prevent inter-spoke communication. This allows the shared services VPC to be reachable from all other VPCs, but the route tables can be configured to not propagate routes between the spoke VPCs, enforcing the desired isolation.
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.
- ✗
VPC Peering with route table customization
Why it's wrong here
VPC Peering for hub-and-spoke works at small scale but doesn't scale well — each spoke needs a peering connection to the hub, and adding routes between many spokes becomes complex.
- ✓
AWS Transit Gateway with route tables
Why this is correct
Transit Gateway supports multiple route tables that control which VPCs can communicate with which. Spoke VPCs route only to the hub's route table, isolating them from each other while allowing shared services access.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Internet Gateway with security groups
Why it's wrong here
Internet Gateways provide internet access — they don't route traffic between VPCs.
- ✗
VPC Endpoints
Why it's wrong here
VPC Endpoints provide private access to AWS services without going through the internet — they don't route traffic between customer VPCs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse VPC Peering with Transit Gateway, assuming that route table customization in peering can achieve transitive routing, but VPC Peering does not support transitive routing (e.g., if VPC A is peered with VPC B and VPC B is peered with VPC C, VPC A cannot reach VPC C through VPC B).
Detailed technical explanation
How to think about this question
AWS Transit Gateway uses a hub-and-spoke model where each VPC attachment is associated with a route table; by default, all attachments in the same route table can communicate, but you can create separate route tables for spoke VPCs and only associate the shared services VPC with each spoke route table, effectively blocking inter-spoke traffic. Under the hood, Transit Gateway leverages the AWS global network and supports up to 5000 VPC attachments per gateway, making it ideal for large-scale, isolated multi-VPC architectures. In a real-world scenario, this is commonly used in enterprises where each business unit has its own VPC but must access centralized logging, DNS, or security scanning tools without lateral movement between units.
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.
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 CLF-C02 question test?
Cloud Technology and Services — This question tests Cloud Technology and Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: AWS Transit Gateway with route tables — AWS Transit Gateway with route tables is the correct choice because it acts as a central hub that connects multiple VPCs (spokes) to a shared services VPC, while using separate route tables to prevent inter-spoke communication. This allows the shared services VPC to be reachable from all other VPCs, but the route tables can be configured to not propagate routes between the spoke VPCs, enforcing the desired isolation.
What should I do if I get this CLF-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.
About these practice questions
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Last reviewed: Jun 11, 2026
This CLF-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 CLF-C02 exam.
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