
AWS Certified Advanced Networking – Specialty (ANS-C01) Certification Guide
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Route 53 Resolver provides a DNS resolution service to VPCs and on-premises resources. Through a combination of endpoints and routing rules for conditional forwarding, Route 53 Resolver integrates on-prem resources in hybrid cloud designs.
Within a VPC, Route 53 Resolver is always the +2 address of the CIDR range. The Resolver is also available at 169.254.169.253
. For example, if you have a VPC with a CIDR of 172.31.0.0/16
, Route 53 Resolver will be 172.31.0.2
.
Figure 7.16 illustrates where AWS will place the Route 53 Resolver endpoint in a VPC using the +2 rule.
Figure 7.16: Route 53 Resolver placement in a VPC
Figure 7.16 shows that resources in other subnets within the VPC will have their DNS client traffic routed to the subnet where the Route 53 Resolver endpoint exists.
As you may recall from the section on private hosted zones, if a private hosted zone is attached to the VPC, Route 53 Resolver will return records for that...