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Gateway attachments are route targets; incorrect associations can blackhole return flows despite healthy tunnels. It does not directly achieve the required result: the AWS gateway receives the branch prefix and return traffic reaches the branch. The constraint is that tunnel health alone does not create a routing advertisement for an omitted customer network.

Negotiation fails when peers cannot agree on an acceptable cryptographic security association. The needed control instead targets BGP path exchange depends on explicitly advertising desired on-premises prefixes to the AWS VPN neighbor; it succeeds when the AWS gateway receives the branch prefix and return traffic reaches the branch.

Overbroad BGP originations can redirect corporate traffic beyond intended AWS destinations. That adjustment does not address the controlling condition: tunnel health alone does not create a routing advertisement for an omitted customer network. Verify the AWS gateway receives the branch prefix and return traffic reaches the branch.

A routed peer cannot distinguish duplicate destination CIDRs in separate VPCs. The decisive technical distinction is AWS PrivateLink exposes a supported service over interface endpoints without general-purpose VPC-to-VPC routing; privateLink service access is narrower than full VPC peering and can work across overlapping address spaces.

Mesh peering grows rapidly in connection and route-management complexity compared with centralized transit routing. For the stated conditions, privateLink service access is narrower than full VPC peering and can work across overlapping address spaces. The more specific mechanism is AWS PrivateLink exposes a supported service over interface endpoints without general-purpose VPC-to-VPC routing.

Each peer must route the remote CIDR explicitly; peering does not act as a universal router. The reported evidence instead concerns AWS PrivateLink exposes a supported service over interface endpoints without general-purpose VPC-to-VPC routing: privateLink service access is narrower than full VPC peering and can work across overlapping address spaces.

Forward hostname A records do not automatically create reverse PTR data for every address. In this situation, private zone visibility follows VPC associations rather than AWS organization membership alone. The proposed change does not ensure approved VPCs resolve the records while nonassociated VPCs cannot use the private zone.

An internal name pointing at a public resource does not remove public network exposure. The needed control instead targets cross-account private hosted zone associations require an authorized association workflow; it succeeds when approved VPCs resolve the records while nonassociated VPCs cannot use the private zone.

A private-only record does not prove control to external validation systems querying public DNS. In this situation, private zone visibility follows VPC associations rather than AWS organization membership alone. The proposed change does not ensure approved VPCs resolve the records while nonassociated VPCs cannot use the private zone.

Keeping stale forwarding targets can cause DNS timeouts despite healthy VPC network interfaces. The reported evidence instead concerns an ALB 504 can reflect a backend timeout even when network routes and listener rules are valid: load-balancer target timing and application processing can exceed idle or response timeout limits.

Network-layer admission can succeed even when the destination application does not accept connections. The reported evidence instead concerns an ALB 504 can reflect a backend timeout even when network routes and listener rules are valid: load-balancer target timing and application processing can exceed idle or response timeout limits.

Traffic tuples may differ before and after NAT while representing one application connection. That property alone cannot account for the reported symptom; load-balancer target timing and application processing can exceed idle or response timeout limits.

Inbound endpoints bring permitted DNS queries into the VPC resolver, unlike outbound endpoints sending them out. It does not directly achieve the required result: queries from the configured test geographies follow the expected geography mapping. The constraint is that geolocation routing is a location-matching policy, not a latency-measurement algorithm.

VPC Resolver may use associated private records while public internet resolvers use the public delegation. It does not directly achieve the required result: queries from the configured test geographies follow the expected geography mapping. The constraint is that geolocation routing is a location-matching policy, not a latency-measurement algorithm.

A parent calculated check can represent health criteria spanning several dependencies instead of testing a single IP alone. The needed control instead targets Route 53 geolocation routing can choose a record by a client's resolved geographic location; it succeeds when queries from the configured test geographies follow the expected geography mapping.

Continuous configuration assessment complements packet monitoring by measuring deployed control state. For the stated conditions, configuration history provides a time series of supported resource states beyond the current console view. The more specific mechanism is AWS Config resource configuration history can record supported configuration changes and relationships.

Packet mirroring provides payload visibility where allowed, while flow logs provide summarized metadata. The reported evidence instead concerns AWS Config resource configuration history can record supported configuration changes and relationships: configuration history provides a time series of supported resource states beyond the current console view.

A management-plane audit trail attributes configuration changes, unlike aggregated data-plane flow records. The reported evidence instead concerns AWS Config resource configuration history can record supported configuration changes and relationships: configuration history provides a time series of supported resource states beyond the current console view.

Origin error statuses can be mapped to viewer-facing responses without modifying the origin application. The decisive technical distinction is a cache key that omits identity-dependent request attributes can mix personalized responses; caching responses without segregating identity-sensitive dimensions can disclose one user's representation to another.

The accelerator uses edge entry points and the AWS global network without requiring content caching. The reported evidence instead concerns a cache key that omits identity-dependent request attributes can mix personalized responses: caching responses without segregating identity-sensitive dimensions can disclose one user's representation to another.

Viewer-request transformations are distinct from long-running application logic executed at the origin. The decisive technical distinction is a cache key that omits identity-dependent request attributes can mix personalized responses; caching responses without segregating identity-sensitive dimensions can disclose one user's representation to another.

TCP pass-through leaves the application backend responsible for certificate and TLS session handling. The reported evidence instead concerns ALB target group stickiness can route a client session to the same eligible target subject to configured conditions: sticky sessions influence load distribution but do not replace external durable session storage.

Instance running state is distinct from the health check HTTP response required by the target group. That property alone cannot account for the reported symptom; sticky sessions influence load distribution but do not replace external durable session storage.

Path-aware routing happens at HTTP layer seven before traffic is forwarded to a selected target. For the stated conditions, sticky sessions influence load distribution but do not replace external durable session storage. The more specific mechanism is ALB target group stickiness can route a client session to the same eligible target subject to configured conditions.

Sticky sessions influence load distribution but do not replace external durable session storage. The reported evidence instead concerns ALB listener rules can apply URL path-pattern conditions to select target groups: path-aware routing happens at HTTP layer seven before traffic is forwarded to a selected target.

Probes sent to a closed backend port mark targets unhealthy even when the service listens elsewhere. The reported evidence instead concerns ALB listener rules can apply URL path-pattern conditions to select target groups: path-aware routing happens at HTTP layer seven before traffic is forwarded to a selected target.

A fixed response is produced by the load balancer and does not depend on backend target availability. For the stated conditions, path-aware routing happens at HTTP layer seven before traffic is forwarded to a selected target. The more specific mechanism is ALB listener rules can apply URL path-pattern conditions to select target groups.

A successfully created flow-log resource can fail to deliver records when its sink authorization is missing. The reported evidence instead concerns cloudWatch missing-data alarm behavior can mask log delivery failures if configured inappropriately: no telemetry can indicate a broken collection pipeline rather than a perfectly healthy network.

A logging source cannot store records in a destination that rejects its service principal. For the stated conditions, no telemetry can indicate a broken collection pipeline rather than a perfectly healthy network. The more specific mechanism is cloudWatch missing-data alarm behavior can mask log delivery failures if configured inappropriately.

Lack of a log record is not definitive proof of absence of every packet event. That property alone cannot account for the reported symptom; no telemetry can indicate a broken collection pipeline rather than a perfectly healthy network.

A static routing arrangement does not automatically form BGP adjacencies or exchange advertisements. That adjustment does not address the controlling condition: tunnel redundancy supports service continuity but does not eliminate performance and routing considerations. Verify approved traffic persists over the remaining tunnel and both become healthy after repair.

A dedicated physical path reduces internet exposure but is not itself equivalent to IPsec confidentiality. The needed control instead targets AWS Site-to-Site VPN connections supply two tunnels for availability and can continue on a surviving tunnel; it succeeds when approved traffic persists over the remaining tunnel and both become healthy after repair.

Public VIF traffic uses public AWS addresses even when the physical transport is dedicated. It does not directly achieve the required result: approved traffic persists over the remaining tunnel and both become healthy after repair. The constraint is that tunnel redundancy supports service continuity but does not eliminate performance and routing considerations.