Amazon Route 53 Resolver
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In this section of the AWS Certified Advanced Networking - Specialty learning path, we introduce you to the various design patterns for content distribution and DNS from an AWS networking perspective that are relevant to the ANS-C01 exam.

Learning Objectives

  • Identify how to leverage Amazon CloudFront for the usage of a content distribution network (CDN)
  • Explain how Amazon Route 53 is used to design solutions that meet public, private, and hybrid DNS requirements
  • Describe how Route 53 can be used within internet-based architectures to route end users to public-facing applications


The AWS Certified Advanced Networking - Specialty certification has been designed for anyone with experience designing, implementing, and operating complex AWS and hybrid networking architectures. Ideally, you’ll also have some exposure to the nuances of AWS networking, particularly regarding the integration of AWS services and AWS security best practices. Many exam questions will require advanced level knowledge of many AWS services, including AWS networking services. The AWS Cloud concepts introduced in this course will be explained and reinforced from the ground up.


The Route 53 resolver is the DNS service for VPCs that integrates with your data center. Connectivity needs to be established between your data center DNS and AWS using a Direct Connect (DX) or a Virtual Private Network (VPN) connection.    You configure endpoints for DNS queries into and out of VPCs. Endpoints are configured through IP address assignment in each subnet needing the Route 53 Resolver. 

Inbound queries allow DNS queries that originate in your data center to resolve AWS-hosted domains.  

Outbound DNS queries are enabled using conditional forwarding rules. Domains hosted in your data center can be configured as forwarding rules in Route 53 resolver.  Rules trigger when a query is made to one of those domains and the request is forwarded to your data center.  This recursive DNS for your VPCs controls how DNS queries are handled between your VPCs and your data center. 


Finally, the Route 53 Resolver DNS firewall is a managed firewall service for DNS queries that start in your VPCs.  You use a firewall rule group to define how Route 53 Resolver DNS firewall inspects and filters traffic coming from your VPC.  Each rule consists of a domain list to inspect in DNS queries and an action to take when a query results in a match.  You can allow a matching query to go through, allow it to go through with an alert or you can block it and respond with a default or a custom response.  To begin the filtering you associate the rule group to the VPCs you want to protect.  Route 53 resolver DNS firewall will apply your defined filtering rules to the outgoing VPC traffic.

About the Author
Jorge Negrón
AWS Content Architect
Learning Paths

Experienced in architecture and delivery of cloud-based solutions, the development, and delivery of technical training, defining requirements, use cases, and validating architectures for results. Excellent leadership, communication, and presentation skills with attention to details. Hands-on administration/development experience with the ability to mentor and train current & emerging technologies, (Cloud, ML, IoT, Microservices, Big Data & Analytics).