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Zorluk: ZorAmazon Route 53 DNS Configuration and Routing Policies

A global media company uses Amazon Route 53 to manage DNS for its streaming platform. To support a new marketing campaign, the operations team needs to route apex domain traffic (media-stream.com) to a set of resources. The primary endpoint is an Application Load Balancer (ALB) in Europe, and the fallback endpoint is a backup service in the United States. The setup must automatically redirect users to the backup service if the European ALB fails its health checks. Which of the following actions should the SysOps administrator take to configure this routing behavior? (Select TWO.)

  1. Create a primary Alias A record for the zone apex pointing to the European Application Load Balancer DNS name, choose a Failover routing policy, and set Evaluate Target Health to Yes.Cevap
  2. Create a secondary Alias A record for the zone apex pointing to the United States backup resource, and choose a Failover routing policy.Cevap
  3. C
    Create a primary CNAME record for the zone apex pointing to the European Application Load Balancer DNS name, choose a Failover routing policy, and associate it with a Route 53 health check.
  4. D
    Create a secondary CNAME record for the zone apex pointing to the United States backup resource, choose a Failover routing policy, and set the TTL to 00 seconds.
  5. E
    Create primary and secondary Alias records for the zone apex, set the routing policy to Failover, but configure them in an Active-Active configuration by disabling Evaluate Target Health on the primary record.

Cevap

The correct actions are to create a primary Alias A record for the zone apex pointing to the European Application Load Balancer DNS name using a Failover routing policy with 'Evaluate Target Health' set to 'Yes', and to create a secondary Alias A record for the zone apex pointing to the United States backup resource using a Failover routing policy.
To satisfy both the zone apex constraint and the automatic active-passive failover requirement, the SysOps administrator must configure Route 53 Alias A records. The primary record points to the European ALB with a Failover policy and 'Evaluate Target Health' enabled. The secondary record points to the United States backup resource under a Failover policy, which receives traffic only when the primary endpoint is unhealthy.

Adım Adım Çözüm

1
Analyze the domain routing target.
The requirement is to configure routing for the zone apex (media-stream.com).
DNS standards do not permit creating CNAME records at the zone apex because other record types (like SOA and NS) must exist at that level.
2
Select the correct record type.
Alias A records must be used instead of CNAME records.
Route 53 Alias records are a virtual extension of DNS that allow mapping the zone apex directly to AWS resources like Application Load Balancers.
3
Configure the active-passive failover routing policy.
Configure a primary Failover record pointing to the European ALB and set 'Evaluate Target Health' to 'Yes'.
Setting 'Evaluate Target Health' to 'Yes' configures Route 53 to automatically evaluate the health of the ALB using its registered target health status.
4
Configure the backup endpoint.
Configure a secondary Failover record pointing to the United States backup resource.
When Route 53 detects that the primary ALB is unhealthy, it shifts DNS query responses to the secondary Failover endpoint.

Anahtar Kavram

Route 53 active-passive failover at the zone apex requires Alias records with health checking enabled.
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Amazon Route 53 DNS Configuration and Routing Policies

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