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A BGP route to a network does not grant permission through intermediate stateful firewalls. That adjustment does not address the controlling condition: gateway attachments are route targets; incorrect associations can blackhole return flows despite healthy tunnels. Verify packet path analysis shows traffic returning through the intended hybrid gateway.

A healthy VPN tunnel does not automatically install every required prefix into every TGW routing domain. It does not directly achieve the required result: packet path analysis shows traffic returning through the intended hybrid gateway. The constraint is that gateway attachments are route targets; incorrect associations can blackhole return flows despite healthy tunnels.

A generic default advertisement cannot replace required more-specific route intent in every hybrid design. The needed control instead targets the TGW routing table must select the VPN or Direct Connect attachment for the on-premises destination; it succeeds when packet path analysis shows traffic returning through the intended hybrid gateway.

Inbound and outbound endpoint directions describe where queries enter or leave the VPC DNS service. The reported evidence instead concerns Route 53 Resolver query logging associations determine which VPC DNS queries are delivered to the log destination: configuring a log destination alone does not start collection from unassociated VPC resolvers.

Creating a rule on a shared outbound endpoint does not cause every VPC to use it automatically. That property alone cannot account for the reported symptom; configuring a log destination alone does not start collection from unassociated VPC resolvers.

An outbound endpoint is a transport mechanism; rule matches determine which names use that transport. That property alone cannot account for the reported symptom; configuring a log destination alone does not start collection from unassociated VPC resolvers.

The source identity visible to a target can differ based on transport and load-balancing configuration. For the stated conditions, deregistering a target can allow in-flight work to finish rather than immediately interrupting every request. The more specific mechanism is ALB target-group deregistration delay controls connection draining behavior during removal.

Instance running state is distinct from the health check HTTP response required by the target group. The decisive technical distinction is ALB target-group deregistration delay controls connection draining behavior during removal; deregistering a target can allow in-flight work to finish rather than immediately interrupting every request.

Weighted target-group routing is distinct from Route 53's DNS-record weighting and operates per ALB request decisions. That property alone cannot account for the reported symptom; deregistering a target can allow in-flight work to finish rather than immediately interrupting every request.

Gateway attachments are route targets; incorrect associations can blackhole return flows despite healthy tunnels. The decisive technical distinction is routing from application subnets needs destination entries targeting the correct hybrid gateway path; an active VIF and BGP session do not automatically override VPC subnet forwarding decisions.

A physical link does not select the intended VIF without the matching VLAN encapsulation. For the stated conditions, an active VIF and BGP session do not automatically override VPC subnet forwarding decisions. The more specific mechanism is routing from application subnets needs destination entries targeting the correct hybrid gateway path.

A private VIF can terminate at a gateway abstraction without one VIF per VPC when constraints permit. The decisive technical distinction is routing from application subnets needs destination entries targeting the correct hybrid gateway path; an active VIF and BGP session do not automatically override VPC subnet forwarding decisions.

Simple routing alone does not make Route 53 suppress failed records based on application health. For the stated conditions, changing a record at the authoritative source does not retroactively purge recursive caches. The more specific mechanism is recursive DNS caching respects record TTL values until cached entries expire.

Signing a hosted zone alone does not establish validation if the parent delegation lacks the needed DS chain. That property alone cannot account for the reported symptom; changing a record at the authoritative source does not retroactively purge recursive caches.

Inbound endpoints bring permitted DNS queries into the VPC resolver, unlike outbound endpoints sending them out. That property alone cannot account for the reported symptom; changing a record at the authoritative source does not retroactively purge recursive caches.

Central policy can coordinate multi-region connectivity at a higher level than one regional Transit Gateway route table. In this situation, tGW peering does not automatically propagate all local routes between peer gateways. The proposed change does not ensure workloads in the permitted regional VPCs reach the expected remote prefixes.

An intermediary peering link does not forward packets between two separately peered VPCs. That adjustment does not address the controlling condition: tGW peering does not automatically propagate all local routes between peer gateways. Verify workloads in the permitted regional VPCs reach the expected remote prefixes.

A route propagated into one TGW table may be invisible to another attachment using a different table. That adjustment does not address the controlling condition: tGW peering does not automatically propagate all local routes between peer gateways. Verify workloads in the permitted regional VPCs reach the expected remote prefixes.

No BGP propagation exists to fill missing route entries in a static-only configuration. In this situation, an active VIF and BGP session do not automatically override VPC subnet forwarding decisions. The proposed change does not ensure application packets take the gateway path toward the corporate network.

A private VIF can terminate at a gateway abstraction without one VIF per VPC when constraints permit. In this situation, an active VIF and BGP session do not automatically override VPC subnet forwarding decisions. The proposed change does not ensure application packets take the gateway path toward the corporate network.

Overbroad BGP originations can redirect corporate traffic beyond intended AWS destinations. It does not directly achieve the required result: application packets take the gateway path toward the corporate network. The constraint is that an active VIF and BGP session do not automatically override VPC subnet forwarding decisions.

A backup tunnel's presence does not guarantee traffic will switch unless routing reacts appropriately. The reported evidence instead concerns a single dedicated Direct Connect connection remains a potential point of physical failure: a redundant hybrid design must address circuit, location and device failure domains independently.

Public VIF traffic uses public AWS addresses even when the physical transport is dedicated. The decisive technical distinction is a single dedicated Direct Connect connection remains a potential point of physical failure; a redundant hybrid design must address circuit, location and device failure domains independently.

The gateway decouples connection location from eligible attached private networks under documented rules. For the stated conditions, a redundant hybrid design must address circuit, location and device failure domains independently. The more specific mechanism is a single dedicated Direct Connect connection remains a potential point of physical failure.

Independent per-packet checks cannot enforce policies requiring full flow context by themselves. The needed control instead targets security groups and NACLs enforce distinct stateful and stateless network boundaries; it succeeds when approved database sessions complete and unwanted subnet traffic stays denied.

Rule order matters only for matching rules. Changing another subnet’s unrelated entry leaves the stateless return-traffic rule unchanged, so response packets are still denied.

Endpoint private addressing does not automatically enforce least-privilege client access. It does not directly achieve the required result: approved database sessions complete and unwanted subnet traffic stays denied. The constraint is that stateful SG return allowance does not override a separate NACL blocking the return direction.

Two provider circuits through one router may still fail together when that router or facility fails. The reported evidence instead concerns dynamic Site-to-Site VPN routing requires consistent BGP capabilities and ASN configuration on the peers: a static routing arrangement does not automatically form BGP adjacencies or exchange advertisements.

IPsec provides confidentiality and integrity across a transport that may use the public internet. For the stated conditions, a static routing arrangement does not automatically form BGP adjacencies or exchange advertisements. The more specific mechanism is dynamic Site-to-Site VPN routing requires consistent BGP capabilities and ASN configuration on the peers.

A backup tunnel's presence does not guarantee traffic will switch unless routing reacts appropriately. The reported evidence instead concerns dynamic Site-to-Site VPN routing requires consistent BGP capabilities and ASN configuration on the peers: a static routing arrangement does not automatically form BGP adjacencies or exchange advertisements.

Traffic logs cannot identify the API principal responsible for a policy change by themselves. It does not directly achieve the required result: records identify the suspicious destination and its approximate transferred volume. The constraint is that network-flow metadata can indicate volume and routing context without revealing encrypted payload contents.

The effective group configuration alone does not reveal which operator or workflow changed it. In this situation, network-flow metadata can indicate volume and routing context without revealing encrypted payload contents. The proposed change does not ensure records identify the suspicious destination and its approximate transferred volume.

Packet-flow metadata is separate from CloudTrail API configuration activity. The needed control instead targets VPC Flow Logs extended fields can support traffic-path and packet count analysis; it succeeds when records identify the suspicious destination and its approximate transferred volume.