Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A company has multiple VPCs in the same AWS account and Region, each with overlapping CIDR blocks (10.0.0.0/16). The SysOps administrator needs to establish connectivity between all VPCs and the on-premises network via AWS Transit Gateway. Additionally, certain VPCs must be isolated from each other while still reaching on-premises. How should the administrator configure the Transit Gateway to meet these requirements?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Create a single Transit Gateway route table and add routes for all VPCs and the on-premises network.
Incorrect. Overlapping CIDRs would cause routing conflicts, and a single route table cannot isolate traffic between VPCs.
B
Best answer
Create multiple Transit Gateway route tables: one for each group of VPCs that need to communicate, and associate each VPC attachment with the appropriate route table. Add static routes to the on-premises network in each route table.
Correct. This allows isolation by route table, and overlapping CIDRs are handled by attaching VPCs to separate route tables. On-premises routes can be added to each.
C
Distractor review
Use VPC peering instead of Transit Gateway to connect VPCs, and use Direct Connect Gateway for on-premises connectivity.
Incorrect. VPC peering does not support overlapping CIDRs, and it does not provide a hub-and-spoke architecture with isolation.
D
Distractor review
Configure VPN connections between each VPC and the on-premises network, bypassing Transit Gateway.
Incorrect. This adds complexity and does not solve inter-VPC isolation or overlapping CIDR issues.
Common exam trap
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Technical deep dive
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Related practice questions
Related SOA-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A company uses Amazon CloudFront to deliver content to a global audience. The origin is an Application Load Balancer in us-east-1. The SysOps administrator wants to reduce costs by minimizing the number of requests that reach the origin server. Which action should the administrator take?
Question 2
A company runs a batch processing application on Amazon EC2 that runs for 2 hours every night. The workload can tolerate interruptions. Which EC2 purchasing option provides the lowest cost for this use case?
Question 3
A SysOps administrator needs to monitor the CPU utilization of an Amazon RDS DB instance and receive an alarm when CPU utilization exceeds 80% for 5 consecutive minutes. Which AWS service should be used to create this alarm?
Question 4
A company runs a critical web application on Amazon EC2 instances in an Auto Scaling group behind an Application Load Balancer (ALB). The application uses session stickiness (sticky sessions) to maintain user sessions. The SysOps administrator notices that when instances are replaced during a scale-in or failure event, users lose their session data. The administrator needs to preserve session data across instance failures without losing stickiness benefits. What should the administrator do?
Question 5
A company runs a production web application on a single Amazon EC2 instance. The application experiences a predictable and steady workload 24/7. The SysOps administrator wants to minimize compute costs for this instance while ensuring it remains available during the expected workload. Which EC2 purchasing option should the administrator use?
Question 6
A company has a VPC with public and private subnets. The private subnets host application servers that need to make outbound HTTPS connections to the internet. The SysOps administrator must implement a solution that provides outbound internet connectivity while preventing inbound connections from the internet. Additionally, the solution must allow the company to control which domains the application servers can access. Which solution should the administrator implement?
FAQ
Questions learners often ask
What does this SOA-C02 question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: Create multiple Transit Gateway route tables: one for each group of VPCs that need to communicate, and associate each VPC attachment with the appropriate route table. Add static routes to the on-premises network in each route table. — AWS Transit Gateway supports separate route tables. By attaching each VPC to a specific route table, you can control which VPCs can communicate. Overlapping CIDRs require route tables to be isolated to avoid conflicts, and VPCs that need isolation should not share the same route table.
What should I do if I get this SOA-C02 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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