The answer is a Route 53 Resolver outbound endpoint with forwarding rules. This is correct because the outbound endpoint acts as a DNS forwarder within the VPC, allowing EC2 instances to send queries for the private domain 'corp.example.com' across the Site-to-Site VPN to the on-premises DNS servers. The forwarding rule specifies which domain (corp.example.com) should be routed to the on-premises resolvers, enabling hybrid DNS resolution without requiring any inbound traffic from the data center. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of hybrid networking and DNS integration, often appearing as a distractor against inbound endpoints or simple VPC DNS settings. A common trap is selecting an inbound endpoint, which is used for on-premises to VPC queries, not the reverse. Memory tip: think "Outbound = Out to on-premises" — the endpoint pushes queries out of the VPC.
SOA-C02 Networking and Content Delivery Practice Question
This SOA-C02 practice question tests your understanding of networking and content delivery. 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 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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Route 53 Resolver outbound endpoints with forwarding rules
Option B is correct because Route 53 Resolver outbound endpoints allow EC2 instances in a VPC to forward DNS queries for a specific domain (e.g., corp.example.com) to on-premises DNS servers via the Site-to-Site VPN connection. By creating a forwarding rule on the outbound endpoint, DNS queries for corp.example.com are sent to the on-premises DNS resolvers, enabling resolution of private DNS names without exposing the VPC to inbound traffic.
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.
✗
Route 53 Resolver inbound endpoints
Why it's wrong here
Inbound endpoints allow on-premises DNS to resolve AWS names. This scenario requires outbound resolution from AWS to on-premises.
✓
Route 53 Resolver outbound endpoints with forwarding rules
Why this is correct
Outbound endpoints forward DNS queries from the VPC to on-premises DNS servers for specified domain names.
Related concept
Read the scenario before looking for a memorised answer.
✗
VPC peering between the VPC and the on-premises network
Why it's wrong here
VPC peering is for connecting VPCs, not for DNS resolution forwarding.
✗
Route 53 private hosted zone for corp.example.com
Why it's wrong here
A private hosted zone would host DNS records in AWS, but it does not forward queries to on-premises servers.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse inbound and outbound endpoints: inbound endpoints are for on-premises to query AWS DNS, while outbound endpoints are for AWS to query on-premises DNS, and the question specifically requires EC2 instances to resolve on-premises names, which is an outbound scenario.
Trap categories for this question
Scenario analysis trap
Inbound endpoints allow on-premises DNS to resolve AWS names. This scenario requires outbound resolution from AWS to on-premises.
Detailed technical explanation
How to think about this question
Route 53 Resolver outbound endpoints use a conditional forwarding mechanism: when a VPC DNS query matches a domain defined in a forwarding rule, the outbound endpoint forwards the query over the VPN to the specified on-premises DNS IP addresses. This leverages the standard DNS protocol (RFC 1035) and requires the VPC's DHCP option set to use the VPC+2 IP address (Route 53 Resolver) as the DNS server. In a real-world scenario, this enables hybrid DNS resolution where AWS resources can resolve on-premises private hostnames without requiring a full DNS zone transfer or duplicate zone management.
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.
Networking and Content Delivery — This question tests Networking and Content Delivery — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Route 53 Resolver outbound endpoints with forwarding rules — Option B is correct because Route 53 Resolver outbound endpoints allow EC2 instances in a VPC to forward DNS queries for a specific domain (e.g., corp.example.com) to on-premises DNS servers via the Site-to-Site VPN connection. By creating a forwarding rule on the outbound endpoint, DNS queries for corp.example.com are sent to the on-premises DNS resolvers, enabling resolution of private DNS names without exposing the VPC to inbound traffic.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.