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Zorluk: KolayAmazon Route 53 DNS Configuration and Routing Policies

A SysOps administrator needs to configure Amazon Route 53 to route traffic for a company's apex domain (example.com) to an Application Load Balancer (ALB). Which two configurations or actions should the administrator choose? (Select TWO.)

  1. Create an Alias A record for the apex domain pointing to the DNS name of the Application Load Balancer.Cevap
  2. Use an Alias record instead of a standard CNAME record because DNS protocol specifications restrict CNAME records from being configured at the zone apex.Cevap
  3. C
    Create a standard CNAME record at the zone apex that points to the Application Load Balancer's public DNS name.
  4. D
    Create an Alias CNAME record at the zone apex to resolve the load balancer's endpoint.
  5. E
    Create a standard A record and manually enter the public IP addresses of the Application Load Balancer.

Cevap

Create an Alias A record for the apex domain pointing to the DNS name of the Application Load Balancer, and use an Alias record instead of a standard CNAME record because DNS protocol specifications restrict CNAME records from being configured at the zone apex.
The correct options are to create an Alias A record pointing to the ALB DNS name and to use Alias records to avoid DNS spec limitations that prohibit standard CNAME records at the zone apex. Route 53 Alias records resolve to the resource IP addresses directly, which complies with standard DNS rules.

Adım Adım Çözüm

1
Identify the target domain routing requirement
The target is the zone apex domain (example.com), which requires a record that resolves to the Application Load Balancer (ALB).
Traffic must be sent directly to the domain name without a 'www' prefix.
2
Determine the record type restrictions
Standard CNAME records cannot be placed at the zone apex due to DNS protocol limitations, and ALB IP addresses are dynamic.
Creating a CNAME at the apex conflicts with other required records like MX and NS, and manual A records cannot track dynamic ALB IP changes.
3
Apply Route 53 features to resolve the restriction
Create a Route 53 Alias A record pointing to the ALB.
Route 53 Alias records bypass the zone apex CNAME restriction by allowing an A record to reference an AWS resource directly.

Anahtar Kavram

Amazon Route 53 Alias records allow mapping zone apex domains to dynamic AWS resources like Application Load Balancers, satisfying DNS specs where standard CNAME records are forbidden.
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Amazon Route 53 DNS Configuration and Routing Policies

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