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Owning the Transit Gateway does not automatically grant authority to attach another account's Direct Connect gateway. That property alone cannot account for the reported symptom; vGW allowed-prefix filters cannot force unsupported more-specific VPC routes to appear in BGP.

Transit VIF connectivity targets Transit Gateway associations instead of directly attaching every individual VPC. The decisive technical distinction is for virtual private gateway associations, allowed prefixes filter VPC CIDRs and cannot advertise an unmatched narrower CIDR; vGW allowed-prefix filters cannot force unsupported more-specific VPC routes to appear in BGP.

The virtual interface type determines whether connectivity targets private VPC addresses or public AWS endpoints. The decisive technical distinction is for virtual private gateway associations, allowed prefixes filter VPC CIDRs and cannot advertise an unmatched narrower CIDR; vGW allowed-prefix filters cannot force unsupported more-specific VPC routes to appear in BGP.

Owning the Transit Gateway does not automatically grant authority to attach another account's Direct Connect gateway. The needed control instead targets a Direct Connect private virtual interface supports private IP routing toward supported VPC gateway connections; it succeeds when corporate hosts reach the permitted VPC CIDRs through private hybrid routes.

VGW allowed-prefix filters cannot force unsupported more-specific VPC routes to appear in BGP. In this situation, the virtual interface type determines whether connectivity targets private VPC addresses or public AWS endpoints. The proposed change does not ensure corporate hosts reach the permitted VPC CIDRs through private hybrid routes.

A dedicated physical path reduces internet exposure but is not itself equivalent to IPsec confidentiality. In this situation, the virtual interface type determines whether connectivity targets private VPC addresses or public AWS endpoints. The proposed change does not ensure corporate hosts reach the permitted VPC CIDRs through private hybrid routes.

Account-by-account manual security policy edits cannot reliably preserve enterprise-wide coverage. That property alone cannot account for the reported symptom; group references bind access to associated workload identities rather than static IP lists.

Endpoint private addressing does not automatically enforce least-privilege client access. The decisive technical distinction is security groups can reference permitted source security groups to express workload relationships; group references bind access to associated workload identities rather than static IP lists.

Security groups lack explicit deny rules while NACL rule-order processing can enforce a scoped subnet deny. That property alone cannot account for the reported symptom; group references bind access to associated workload identities rather than static IP lists.

Dynamic container networking requires registration of actual reachable task addresses instead of fixed node identities. In this situation, static NLB frontend addressing suits IP allowlisting while ALB addresses may change over time. The proposed change does not ensure the partner reaches the backend after scaling without changing its static regional IP allowlist.

GWLB is designed for appliance insertion rather than content-based ALB routing or general TCP endpoints alone. It does not directly achieve the required result: the partner reaches the backend after scaling without changing its static regional IP allowlist. The constraint is that static NLB frontend addressing suits IP allowlisting while ALB addresses may change over time.

A fixed response is produced by the load balancer and does not depend on backend target availability. The needed control instead targets network Load Balancer can provide stable regional IP entry points for suitable network listeners; it succeeds when the partner reaches the backend after scaling without changing its static regional IP allowlist.

Endpoint weights divide traffic within a Region's group rather than controlling traffic sent to entire Regions. It does not directly achieve the required result: connections from the same source address consistently prefer the same healthy endpoint under normal routing. The constraint is that five-tuple flow hashing may send different source ports to different endpoints, unlike source-IP affinity.

Endpoint health-based routing avoids relying solely on geographically closest endpoints during failures. That adjustment does not address the controlling condition: five-tuple flow hashing may send different source ports to different endpoints, unlike source-IP affinity. Verify connections from the same source address consistently prefer the same healthy endpoint under normal routing.

The accelerator uses edge entry points and the AWS global network without requiring content caching. That adjustment does not address the controlling condition: five-tuple flow hashing may send different source ports to different endpoints, unlike source-IP affinity. Verify connections from the same source address consistently prefer the same healthy endpoint under normal routing.

A healthy VPN tunnel does not automatically install every required prefix into every TGW routing domain. The reported evidence instead concerns static-routing VPN configurations require explicit destination prefixes for the intended private networks: no BGP propagation exists to fill missing route entries in a static-only configuration.

Private circuit establishment alone does not provision vendor encryption or control-plane overlays. For the stated conditions, no BGP propagation exists to fill missing route entries in a static-only configuration. The more specific mechanism is static-routing VPN configurations require explicit destination prefixes for the intended private networks.

Gateway attachments are route targets; incorrect associations can blackhole return flows despite healthy tunnels. The reported evidence instead concerns static-routing VPN configurations require explicit destination prefixes for the intended private networks: no BGP propagation exists to fill missing route entries in a static-only configuration.

An intermediary peering link does not forward packets between two separately peered VPCs. The needed control instead targets privateLink endpoint services support consumer acceptance and allowed-principal restrictions; it succeeds when unauthorized consumers remain denied and approved endpoints enter an accepted usable state.

A routed peer cannot distinguish duplicate destination CIDRs in separate VPCs. That adjustment does not address the controlling condition: publishing an endpoint service does not inherently authorize arbitrary accounts to establish private access. Verify unauthorized consumers remain denied and approved endpoints enter an accepted usable state.

Resource ownership and spoke VPC ownership can remain separate while attachments are governed centrally. In this situation, publishing an endpoint service does not inherently authorize arbitrary accounts to establish private access. The proposed change does not ensure unauthorized consumers remain denied and approved endpoints enter an accepted usable state.

Failback requires explicit routing preference rather than assuming an active link automatically dominates. That property alone cannot account for the reported symptom; successful small packets do not demonstrate that larger Ethernet frames traverse every hybrid hop.

Multiple healthy links can compete for the same destination; configuration controls the selected route. That property alone cannot account for the reported symptom; successful small packets do not demonstrate that larger Ethernet frames traverse every hybrid hop.

An association change can alter BGP-originated reachability without deleting the physical VIF. For the stated conditions, successful small packets do not demonstrate that larger Ethernet frames traverse every hybrid hop. The more specific mechanism is a hybrid path MTU mismatch can impair larger packets even when small ICMP tests succeed.

Logical-ID changes can cause CloudFormation to replace networking resources unexpectedly. For the stated conditions, partially failed infrastructure updates need lifecycle-aware rollback handling, not random manual edits. The more specific mechanism is cloudFormation stack operations track rollback and resource events for controlled failure recovery.

Event-driven notifications observe resource modifications instead of waiting for scheduled inventory scans. The decisive technical distinction is cloudFormation stack operations track rollback and resource events for controlled failure recovery; partially failed infrastructure updates need lifecycle-aware rollback handling, not random manual edits.

Resource creation and cross-account permission grants are separate lifecycle operations. For the stated conditions, partially failed infrastructure updates need lifecycle-aware rollback handling, not random manual edits. The more specific mechanism is cloudFormation stack operations track rollback and resource events for controlled failure recovery.

Inbound endpoints bring permitted DNS queries into the VPC resolver, unlike outbound endpoints sending them out. It does not directly achieve the required result: a sufficiently large sample of uncached resolver queries approximates the planned canary distribution. The constraint is that weights control relative DNS record selection rather than counting individual HTTP requests or user sessions.

Authoritative signing and recursive validation occur at different ends of the DNS trust workflow. The needed control instead targets Route 53 weighted routing uses relative record weights to influence DNS answer selection; it succeeds when a sufficiently large sample of uncached resolver queries approximates the planned canary distribution.

Inbound endpoint existence does not grant resolution of private zones absent from its resolver view. In this situation, weights control relative DNS record selection rather than counting individual HTTP requests or user sessions. The proposed change does not ensure a sufficiently large sample of uncached resolver queries approximates the planned canary distribution.

A private S3 origin prevents viewers bypassing edge controls through an unrestricted bucket endpoint. In this situation, changing an origin file does not automatically replace copies already cached at edge locations. The proposed change does not ensure new requests receive the new script bytes rather than the cached prior release.

Origin error statuses can be mapped to viewer-facing responses without modifying the origin application. It does not directly achieve the required result: new requests receive the new script bytes rather than the cached prior release. The constraint is that changing an origin file does not automatically replace copies already cached at edge locations.

CloudFront can serve cached objects near viewers without contacting the origin for each request. The needed control instead targets cached objects can remain fresh until their TTL expires or an invalidation is issued; it succeeds when new requests receive the new script bytes rather than the cached prior release.