A company is using custom DNS servers that run BIND for name resolution in its VPCs. The VPCs are deployed across multiple AWS accounts that are part of the same organization in AWS Organizations. All the VPCs are connected to a transit gateway. The BIND servers are running in a central VPC and are configured to forward all queries for an on-premises DNS domain to DNS servers that are hosted in an on-premises data center. To ensure that all the VPCs use the custom DNS servers, a network engineer has configured a VPC DHCP options set in all the VPCs that specifies the custom DNS servers to be used as domain name servers. Multiple development teams in the company want to use Amazon Elastic File System (Amazon EFS). A development team has created a new EFS file system but cannot mount the file system to one of its Amazon EC2 instances. The network engineer discovers that the EC2 instance cannot resolve the IP address for the EFS mount point fs-33444567d.efs.us-east-1.amazonaws.com. The network engineer needs to implement a solution so that development teams throughout the organization can mount EFS file systems. Which combination of steps will meet these requirements? (Choose two.)
Select 2 answers.
Marked answer: A
This question asks for 2 answers, but our data marks only 1. Compare with the community discussion below for the full answer.
Community Discussion
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Chose BD1
b and d is correct answer
Chose AD1
✅ Option A — CORRECT A. Configure the BIND DNS servers in the central VPC to forward queries for efs.us-east-1.amazonaws.com to the Amazon-provided DNS server (169.254.169.253). 📌 This is the recommended pattern when using custom DNS + AWS services. ✅ Option D — CORRECT 📌 It's the modern and scalable approach compared to bind-only forwarding.
Chose AD1
ambiguous question. The questions should be more clear, for example: "The company wants to eliminate the BIND servers and use AWS-managed services" in that case the answer should be B and D, or if the question says "Resolve the issue with the minimal effort", probably the answer should be only A, or A and D if we planning to remove BIND servers in the future.
