Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A company has an Amazon VPC with a CIDR block of 10.0.0.0/16 and an AWS Site-to-Site VPN connection to an on-premises data center. The on-premises DNS servers host a private domain 'corp.example.com'. The SysOps administrator needs to enable EC2 instances in the VPC to resolve DNS names for 'corp.example.com' using the on-premises DNS servers. Which Route 53 feature should be configured?
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
Route 53 Resolver inbound endpoints
Inbound endpoints allow on-premises DNS to resolve AWS names. This scenario requires outbound resolution from AWS to on-premises.
B
Best answer
Route 53 Resolver outbound endpoints with forwarding rules
Outbound endpoints forward DNS queries from the VPC to on-premises DNS servers for specified domain names.
C
Distractor review
VPC peering between the VPC and the on-premises network
VPC peering is for connecting VPCs, not for DNS resolution forwarding.
D
Distractor review
Route 53 private hosted zone for corp.example.com
A private hosted zone would host DNS records in AWS, but it does not forward queries to on-premises servers.
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: Route 53 Resolver outbound endpoints with forwarding rules — Route 53 Resolver outbound endpoints allow DNS queries from the VPC to be forwarded to on-premises DNS servers for private hosted zones. You create an outbound endpoint and associate forwarding rules to match specific domains (like corp.example.com) and forward queries to the on-premises DNS server IPs. Inbound endpoints are used for the reverse direction (on-premises to AWS). VPC peering does not forward DNS. Route53 private hosted zones are used for internal AWS domain resolution, not for forwarding to on-premises.
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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