Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company has two VPCs in the same AWS account and Region: VPC-A (10.0.0.0/16) and VPC-B (10.1.0.0/16). The SysOps administrator needs to establish connectivity between these VPCs so that resources in VPC-A can reach resources in VPC-B using private IP addresses. The solution must be highly available and not involve a third-party appliance. Which solution should the administrator implement?
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 an AWS Transit Gateway and attach both VPCs to it. Configure route tables to allow communication.
Transit Gateway solves the problem but introduces additional complexity and cost (hourly charge per attachment). For only two VPCs, VPC Peering is simpler and more cost-effective.
B
Best answer
Create a VPC Peering connection between VPC-A and VPC-B. Update the route tables in each VPC to add routes to the other VPC's CIDR.
VPC Peering provides direct, private connectivity between two VPCs. It is highly available by nature and supports cross-account connections. Route tables must be updated to enable traffic flow.
C
Distractor review
Attach an internet gateway to each VPC and use Amazon Route 53 to resolve private DNS names over the internet.
Using internet gateways routes traffic over the public internet, not private IP addresses. This would expose traffic to the internet and incur data transfer costs, violating the requirement for private IP communication.
D
Distractor review
Set up a site-to-site VPN connection between the two VPCs using AWS Virtual Private Gateway.
Site-to-site VPN connections require a VPN endpoint in each VPC and are designed for on-premises connectivity. Using it for VPC-to-VPC is overly complex and not as reliable as VPC Peering.
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 a VPC Peering connection between VPC-A and VPC-B. Update the route tables in each VPC to add routes to the other VPC's CIDR. — A VPC Peering connection is a networking connection between two VPCs that enables routing using private IP addresses. It is highly available (no single point of failure) and does not require a third-party appliance. The administrator simply creates a peering connection between the two VPCs and updates the route tables. An internet gateway is for internet access, not VPC-to-VPC. Transit Gateway is also a solution but more complex and costly for just two VPCs; peering is simpler and sufficient. VPN connection is for on-premises connectivity.
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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