- A
Create a VPC peering connection and use the on-premises DNS IP as the DHCP option set.
Why wrong: Incorrect. VPC peering connects VPCs, not a VPC to an on-premises network. It does not provide DNS resolution to on-premises servers.
- B
Configure Route 53 Resolver outbound endpoint to forward queries to on-premises DNS.
Correct. A Route 53 Resolver outbound endpoint forwards queries from the VPC to the on-premises DNS server, enabling resolution of on-premises hostnames.
- C
Create a VPC peering connection to the on-premises network.
Why wrong: Incorrect. VPC peering is for VPC-to-VPC connections; an on-premises network requires VPN or Direct Connect, and DNS forwarding via Route 53 Resolver.
- D
Configure Route 53 Resolver inbound endpoint to forward DNS queries from on-premises to AWS.
Why wrong: Incorrect. A Route 53 Resolver inbound endpoint allows on-premises DNS to forward queries to AWS, not the other way around. For AWS-to-on-premises resolution, an outbound endpoint is needed.
SOA-C02 Route 53 Resolver outbound endpoint 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. A key principle to apply: route 53 Resolver outbound endpoint. 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 needs to resolve DNS names for on-premises servers from AWS. They have set up a DHCP options set with the on-premises DNS server IP. Which additional step is required?
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
Configure Route 53 Resolver outbound endpoint to forward queries to on-premises DNS.
Option B is correct. The DHCP options set configures VPC resources to use the on-premises DNS server IP. However, to actually forward DNS queries from the VPC to the on-premises DNS server for resolution of on-premises hostnames, you need a Route 53 Resolver outbound endpoint. This endpoint provides a forwarding path from the VPC to the on-premises network (over VPN or Direct Connect). Option D (inbound endpoint) is used for the reverse direction—allowing on-premises DNS to forward queries to AWS for resolving private hosted zones—and is not required here. Options A and C are incorrect because VPC peering does not enable DNS resolution to on-premises networks; dedicated connectivity and DNS forwarding via Route 53 Resolver are needed.
Key principle: Route 53 Resolver outbound endpoint
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a VPC peering connection and use the on-premises DNS IP as the DHCP option set.
Why it's wrong here
Incorrect. VPC peering connects VPCs, not a VPC to an on-premises network. It does not provide DNS resolution to on-premises servers.
- ✓
Configure Route 53 Resolver outbound endpoint to forward queries to on-premises DNS.
Why this is correct
Correct. A Route 53 Resolver outbound endpoint forwards queries from the VPC to the on-premises DNS server, enabling resolution of on-premises hostnames.
Related concept
Route 53 Resolver outbound endpoint
- ✗
Create a VPC peering connection to the on-premises network.
- ✗
Configure Route 53 Resolver inbound endpoint to forward DNS queries from on-premises to AWS.
Why it's wrong here
Incorrect. A Route 53 Resolver inbound endpoint allows on-premises DNS to forward queries to AWS, not the other way around. For AWS-to-on-premises resolution, an outbound endpoint is needed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is confusing the direction of DNS forwarding. Candidates often select the inbound endpoint (Option D) thinking it forwards queries from AWS to on-premises, but in reality, the inbound endpoint handles queries coming from on-premises into AWS. The correct direction for AWS-to-on-premises forwarding is the outbound endpoint (Option B).
Detailed technical explanation
How to think about this question
Route 53 Resolver inbound endpoints use Elastic Network Interfaces (ENIs) in the VPC with private IP addresses, which on-premises DNS servers can target as forwarders. The DHCP options set assigns the on-premises DNS server IP to AWS instances, but for conditional forwarding (e.g., resolving custom domain names hosted in AWS), the inbound endpoint is essential. In real-world hybrid architectures, this setup often pairs with an outbound endpoint for bidirectional resolution, but the question specifically asks for resolving on-premises names from AWS, which requires the inbound endpoint.
KKey Concepts to Remember
- Route 53 Resolver outbound endpoint
- DHCP options set
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
Route 53 Resolver outbound endpoint
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.
Visual reference
Quick reference
Common DNS Record Types
| Record | Purpose | Example |
|---|---|---|
| A | IPv4 address mapping | example.com → 93.184.216.34 |
| AAAA | IPv6 address mapping | example.com → 2606:2800::1 |
| CNAME | Alias to another hostname | www → example.com |
| MX | Mail server for domain | example.com → mail.example.com (priority 10) |
| TXT | Text data (SPF, DKIM, verification) | v=spf1 include:_spf.example.com ~all |
| NS | Authoritative name servers | example.com NS ns1.example.com |
| PTR | Reverse DNS (IP → hostname) | 34.216.184.93.in-addr.arpa → example.com |
| SOA | Zone authority record | Primary NS, admin email, serial, TTL defaults |
What to study next
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
Networking and Content Delivery — This question tests Networking and Content Delivery — Route 53 Resolver outbound endpoint.
What is the correct answer to this question?
The correct answer is: Configure Route 53 Resolver outbound endpoint to forward queries to on-premises DNS. — Option B is correct. The DHCP options set configures VPC resources to use the on-premises DNS server IP. However, to actually forward DNS queries from the VPC to the on-premises DNS server for resolution of on-premises hostnames, you need a Route 53 Resolver outbound endpoint. This endpoint provides a forwarding path from the VPC to the on-premises network (over VPN or Direct Connect). Option D (inbound endpoint) is used for the reverse direction—allowing on-premises DNS to forward queries to AWS for resolving private hosted zones—and is not required here. Options A and C are incorrect because VPC peering does not enable DNS resolution to on-premises networks; dedicated connectivity and DNS forwarding via Route 53 Resolver are needed.
What should I do if I get this SOA-C02 question wrong?
Review route 53 Resolver outbound endpoint, then practise related SOA-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Route 53 Resolver outbound endpoint
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Last reviewed: Jun 24, 2026
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