Authoritative DNSSEC signing produces authenticated records, while the parent DS record allows validating resolvers to connect those signatures to the domain's delegation chain; it changes a different aspect of the architecture rather than fulfilling the need to monitor a private endpoint for DNS failover.

Resolver validation checks cryptographic DNSSEC integrity of applicable DNS responses; it is separate from signing the organization's own authoritative hosted zones; the operational gap would remain because the question requires a way to monitor a private endpoint for DNS failover.

Alias target-health evaluation can use the health of supported AWS targets for routing decisions, reducing reliance on separate manually maintained IP-based checks; it is not the action that directly makes the system monitor a private endpoint for DNS failover.

The rule association tells the VPC Resolver which suffix to forward via the outbound endpoint; endpoint creation alone does not redirect DNS requests for that domain; it changes a different aspect of the architecture rather than fulfilling the need to select the correct overlapping forwarding rule.

The parent DNS zone must direct recursive resolvers to the child zone's authoritative name servers; changing the parent zone's registrar NS would delegate the entire parent domain instead; the operational gap would remain because the question requires a way to select the correct overlapping forwarding rule.

Sharing lets other accounts reuse the centrally managed forwarding rule, while each intended VPC still requires association to activate it; it is not the action that directly makes the system select the correct overlapping forwarding rule.

The parent DNS zone must direct recursive resolvers to the child zone's authoritative name servers; changing the parent zone's registrar NS would delegate the entire parent domain instead; the operational gap would remain because the question requires a way to avoid split-horizon fallback assumptions.

An inbound Resolver endpoint resolves using the DNS view of its VPC, so a private hosted zone available only in another VPC is not automatically available across the connection; it is not the action that directly makes the system avoid split-horizon fallback assumptions.

The hosted zone owner grants association authorization, and the VPC owner completes the association; IAM trust does not automatically establish private DNS visibility; that still would not establish the requested outcome: avoid split-horizon fallback assumptions.

Standard Route 53 endpoint health checkers test public endpoints, whereas an alarm-based health check can reflect a custom probe that runs inside private connectivity; it is not the action that directly makes the system establish authoritative DNSSEC trust.

Resolver validation checks cryptographic DNSSEC integrity of applicable DNS responses; it is separate from signing the organization's own authoritative hosted zones; that still would not establish the requested outcome: establish authoritative DNSSEC trust.

The rule association tells the VPC Resolver which suffix to forward via the outbound endpoint; endpoint creation alone does not redirect DNS requests for that domain; those conditions do not produce the required result: establish authoritative DNSSEC trust.

Flow Logs describe observed packet metadata. A path that configuration permits but that no client has used might not appear in the logs.

Reachability Analyzer is useful for analyzing a specified path, but one pair is not a scope-wide search over all paths matching a policy.

CloudTrail captures supported control-plane and data events, not a comprehensive static graph of possible network flows.

DNS response-code observations can distinguish nonexistence responses from failed or timed-out upstream resolution, guiding whether to inspect records or network paths; the scenario instead needs an action that will restore resolution for a selectively forwarded suffix.

The rule association tells the VPC Resolver which suffix to forward via the outbound endpoint; endpoint creation alone does not redirect DNS requests for that domain; it changes a different aspect of the architecture rather than fulfilling the need to restore resolution for a selectively forwarded suffix.

Resolver query information can tie source, queried name, response and time to DNS security rule behavior, helping distinguish an actual blocked lookup from application DNS failures; the operational gap would remain because the question requires a way to restore resolution for a selectively forwarded suffix.

ALB access logs contain request-level load balancer and target status fields, separating errors generated by the load balancer from application responses; those conditions do not produce the required result: ramp HTTP requests to warm-up targets.

ALB can initiate HTTPS connections to backend targets, protecting the load-balancer-to-target segment; this is distinct from configuring a viewer-side HTTPS listener; it changes a different aspect of the architecture rather than fulfilling the need to ramp HTTP requests to warm-up targets.

The deregistration delay sets how long a deregistering target can continue draining existing requests before being fully removed from service; it is not the action that directly makes the system ramp HTTP requests to warm-up targets.

A gateway timeout can occur when a backend does not respond in time; comparing request timing and target logs tests the hypothesis more directly than DNS registration changes; it changes a different aspect of the architecture rather than fulfilling the need to support legitimate long idle periods.

Server Name Indication lets the load balancer choose the appropriate configured certificate for the requested hostname without requiring one public IP per certificate; the operational gap would remain because the question requires a way to support legitimate long idle periods.

Weighted target groups divide requests at the listener forwarding decision; DNS weighted routing does not control the per-request split within one ALB; that still would not establish the requested outcome: support legitimate long idle periods.

An Application Load Balancer can transform supported HTTP requests into Lambda events and return its response as HTTP without an EC2 or IP target listener; the operational gap would remain because the question requires a way to authenticate clients during HTTPS termination.

ALB can initiate HTTPS connections to backend targets, protecting the load-balancer-to-target segment; this is distinct from configuring a viewer-side HTTPS listener; that still would not establish the requested outcome: authenticate clients during HTTPS termination.

ALB mutual TLS verification can consult configured CRLs in its trust store; relying only on an unchanged CA certificate would continue accepting a nonexpired certificate unless revocation is enforced; the scenario instead needs an action that will authenticate clients during HTTPS termination.

The 7224:9300 public-VIF scope community requests global AWS Region propagation, which exceeds the stated local-only policy.

The 7224:9200 community limits public virtual interface propagation to AWS Regions on the same continent, which is broader than the one-Region scope requested by the policy.

The 7224:7300 tag is a high local-preference community for private/transit VIF return-path preference, not the public VIF scope requested here.

TGW VPC attachment data-plane availability depends on enabled attachment AZs; a subnet without an attachment path cannot assume that another AZ's attachment automatically carries its traffic; that still would not establish the requested outcome: connect packet inspection appliances to GWLB.

GWLB uses GENEVE encapsulation to distribute traffic to inspection appliances, while GWLBe provides a private steering endpoint inside service-consumer VPCs; the scenario instead needs an action that will connect packet inspection appliances to GWLB.

TGW appliance mode helps ensure the same appliance AZ is selected for a flow in both directions, which is important for stateful inspection continuity; those conditions do not produce the required result: connect packet inspection appliances to GWLB.