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Difficulty: MediumAmazon Route 53 DNS Configuration and Routing Policies

A company hosts a web application at the zone apex (example.com). The application is deployed behind Application Load Balancers (ALBs) located in both the us-east-1 and eu-central-1 Regions. A SysOps Administrator needs to configure Amazon Route 53 to route user traffic to the region that offers the lowest network latency. Additionally, the configuration must automatically divert traffic away from a region if its ALB becomes unhealthy. Which two actions should the SysOps Administrator take to meet these requirements? (Select TWO.)

  1. Create an Alias A record at the zone apex for each region and select the Latency routing policy.Answer
  2. Configure the Evaluate Target Health setting to Yes on both Alias records.Answer
  3. C
    Create a CNAME record at the zone apex for each region pointing to the DNS name of the ALB in that region.
  4. D
    Configure a Geolocation routing policy record for each region and map them to the users' nearest geographic locations.
  5. E
    Create Route 53 active-passive Failover routing records for the ALBs and associate them with a CloudWatch alarm.

Answer

Create an Alias A record at the zone apex for each region, select the Latency routing policy, and configure the Evaluate Target Health setting to Yes on both Alias records.
To route traffic to the region offering the lowest network latency for a zone apex, Route 53 Alias A records must be created with a Latency routing policy. Additionally, to ensure high availability, the 'Evaluate Target Health' setting should be set to Yes on these Alias records so Route 53 automatically detects the health of the ALB target groups and reroutes traffic if an ALB fails.

Step-by-Step Solution

1
Determine the record type to use at the zone apex.
Identify that a CNAME record cannot be used at the zone apex due to DNS standards. An Alias A record pointing to the ALB is required.
Alias records allow routing traffic at the zone apex directly to AWS resources like Application Load Balancers.
2
Select the correct routing policy to optimize user performance.
Choose the Latency routing policy for the Alias records in both regions.
Latency routing policy routes users to the region that offers the lowest network latency, which aligns with the performance goal.
3
Configure high availability and failover mechanism.
Set 'Evaluate Target Health' to Yes on both records.
Setting 'Evaluate Target Health' to Yes enables Route 53 to check the health of the ALB (and its target groups) and automatically stop routing traffic to that region if it becomes unhealthy.

Key Concept

Configuring latency-based routing at the zone apex using Alias records and enabling target health evaluation for automatic regional failover.
Estimated Time:2m 0s
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Topics

Amazon Route 53 DNS Configuration and Routing Policies

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