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AWS Certified Advanced Networking - Specialty · AWS
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C is right! A: CIDR block conflicts are not relevant here, as PrivateLink operates at the network interface level and is independent of the CIDR block configuration of the VPC. B: The enableDnsHostnames and enableDnsSupport attributes are required for DNS resolution of private endpoints, but their absence would not block the creation of an endpoint in a specific Availability Zone. D: The new subnets do not need a route to an internet gateway to use AWS PrivateLink, as it operates within the AWS network and does not rely on public internet routing.
this is C
AWS PrivateLink endpoints require the service to be available in the Availability Zone where the endpoint is being created. If the SaaS provider does not offer the service in the new Availability Zone and cross-zone load balancing is not configured for the NLB, the endpoint cannot be deployed in that Availability Zone. This is a likely cause of the problem because the endpoint creation depends on the service being present and accessible in the desired Availability Zone.