Topic 1 Question 253

AWS Certified Advanced Networking - Specialty

Topic 1 Question 253
A company has an application VPC and a networking VPC that are connected through VPC peering. The networking VPC contains a Network Load Balancer (NLB). The application VPC contains Amazon EC2 instances that run an application. The EC2 instances are part of a target group that is associated with the NLB in the networking VPC.

The company configures a third VPC and peers it to the networking VPC. The new VPC contains a new version of the existing application. The new version of the application runs on new EC2 instances in an application subnet. The new version of the application runs in a different Availability Zone than that original version of the application.

The company needs to establish connectivity between the NLB and the new version of the application.

Which combination of steps will meet this requirement?

3 つ選択
- Register the new application EC2 instances with the NLB by using the instance IDs.
- Register the new application EC2 instances with the NLB by using instance IP addresses.
- Configure the NLB in the Availability Zone where the new application EC2 instances run.
- Configure the NLB to use zonal shift.
- Configure the network ACL for the application subnet in the new VPC to allow outbound connections.
- Configure the network ACL for the application subnet in the new VPC to allow inbound connections and outbound connections.
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- 正解だと思う選択肢: BCF
  BCF: When registering targets by instance ID, instances must be in the same Amazon VPC as the Network Load Balancer. See https://docs.aws.amazon.com/elasticloadbalancing/latest/network/load-balancer-target-groups.html#target-type
  
  👍 1
  c1193d42025/01/07
- 正解だと思う選択肢: BCF
  A. Register the new application EC2 instances with the NLB by using the instance IDs:
  
  Instance ID registration is not supported across VPC peering connections because the NLB cannot resolve private DNS names or directly communicate with instances in a different VPC.
  
  D. Configure the NLB to use zonal shift:
  
  Zonal shift is a feature of AWS Elastic Disaster Recovery (DRS) for mitigating zonal outages, not for enabling communication with targets in different Availability Zones.
  
  E. Configure the network ACL for the application subnet in the new VPC to allow outbound connections:
  
  Outbound-only configuration is insufficient. Both inbound and outbound rules are required for full communication between the NLB and the EC2 instances.
  👍 1
  woorkim2025/01/12
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