www.example.com must resolve to an Application Load Balancer.
Do not update DNS manually when the ALB addresses change.
Which record is most appropriate?
Create a Route 53 alias A record that targets the ALB.
Detailed explanation
An alias can reference the AWS resource name and follows ALB address changes automatically.
An alias can reference the AWS resource name and follows ALB address changes automatically.
Load-balancer addresses can change, which would require manual DNS updates.
Load-balancer addresses can change, which would require manual DNS updates.
A CDN cache is not a Route 53 record-management mechanism.
A CDN cache is not a Route 53 record-management mechanism.
S3 lifecycle management does not manage DNS records.
S3 lifecycle management does not manage DNS records.
Check official documentation
Compare the following points with the official documentation.
Route 53 alias records for ELBの公式説明を確認する。
What to confirm
aliasレコードと固定IPのAレコードを区別できる。
Key points
- Route 53 alias
- ALB
- A record
Notes
- Environment: AWS公式SOA-C03試験ガイドとAWS公式ドキュメントの確認
- Confirm current AWS service behavior in the official documentation.
Foundation review
Resource reference
An alias follows the load balancer resource while a literal A record can become stale.
DNS and routing
DNS selects the load-balancer name; the ALB then distributes requests to targets.