Step-by-Step Explanation:
Understand the Problem:
There are two applications, one in an on-premises data center and the other on an Amazon EC2 instance.
DNS resolution fails when the on-premises application tries to connect to the EC2 instance.
The goal is to implement DNS resolution between on-premises and AWS resources.
Analyze the Requirements:
Need to resolve the hostname of the EC2 instance from the on-premises network.
Utilize the existing AWS Site-to-Site VPN connection for DNS queries.
Evaluate the Options:
Option A: Set up an Amazon Route 53 inbound resolver endpoint with a forwarding rule for the onprem.private hosted zone.
This allows DNS queries from on-premises to be forwarded to Route 53 for resolution.
The resolver endpoint is associated with the VPC, enabling resolution of AWS resources.
Option B: Set up an Amazon Route 53 inbound resolver endpoint without specifying the forwarding rule.
This option does not address the specific need to resolve onprem.private DNS queries.
Option C: Set up an Amazon Route 53 outbound resolver endpoint.
Outbound resolver endpoints are used for forwarding DNS queries from AWS to on-premises, not vice versa.
Option D: Set up an Amazon Route 53 outbound resolver endpoint without specifying the forwarding rule.
Similar to Option C, this does not meet the requirement of resolving on-premises queries in AWS.
Select the Best Solution:
Option A: Setting up an inbound resolver endpoint with a forwarding rule for onprem.private and associating it with the VPC ensures that DNS queries from on-premises can resolve AWS resources effectively.
Amazon Route 53 Resolver
Integrating AWS and On-Premises Networks with Route 53
Using an Amazon Route 53 inbound resolver endpoint with a forwarding rule ensures that on-premises applications can resolve EC2 instance hostnames effectively.
