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Failback requires explicit routing preference rather than assuming an active link automatically dominates. The reported evidence instead concerns gateway route selection and BGP routing preferences influence preferred hybrid forwarding: multiple healthy links can compete for the same destination; configuration controls the selected route.

Peer connection state does not automatically propagate remote VPC CIDR changes. The reported evidence instead concerns gateway route selection and BGP routing preferences influence preferred hybrid forwarding: multiple healthy links can compete for the same destination; configuration controls the selected route.

Coarse summarization can hide reachability differences and route withdrawals from downstream peers. The reported evidence instead concerns gateway route selection and BGP routing preferences influence preferred hybrid forwarding: multiple healthy links can compete for the same destination; configuration controls the selected route.

Private PKI establishes internal identity only when clients explicitly trust its CA chain. It does not directly achieve the required result: each approved hostname negotiates a certificate containing that name. The constraint is that sNI allows selection of a certificate by requested hostname, not by target group alone.

Load-balancer TLS termination could change where mutual authentication occurs. That adjustment does not address the controlling condition: sNI allows selection of a certificate by requested hostname, not by target group alone. Verify each approved hostname negotiates a certificate containing that name.

Network peer authentication cannot independently prove that a particular HTTPS hostname is the intended app server. It does not directly achieve the required result: each approved hostname negotiates a certificate containing that name. The constraint is that sNI allows selection of a certificate by requested hostname, not by target group alone.

The virtual interface type determines whether connectivity targets private VPC addresses or public AWS endpoints. The decisive technical distinction is AWS Site-to-Site VPN provides encrypted tunnels between a customer gateway and an AWS gateway; IPsec provides confidentiality and integrity across a transport that may use the public internet.

A static routing arrangement does not automatically form BGP adjacencies or exchange advertisements. The reported evidence instead concerns AWS Site-to-Site VPN provides encrypted tunnels between a customer gateway and an AWS gateway: IPsec provides confidentiality and integrity across a transport that may use the public internet.

A redundant hybrid design must address circuit, location and device failure domains independently. The decisive technical distinction is AWS Site-to-Site VPN provides encrypted tunnels between a customer gateway and an AWS gateway; IPsec provides confidentiality and integrity across a transport that may use the public internet.

Creating records in an unused hosted zone does not cause global resolvers to query it automatically. The needed control instead targets split-horizon DNS can use a public hosted zone and an associated private hosted zone for the same namespace; it succeeds when an internal resolver returns the private endpoint while public queries return the internet-facing address.

IPv6-only clients cannot infer an IPv6 destination from an A record carrying only IPv4 addresses. That adjustment does not address the controlling condition: VPC Resolver may use associated private records while public internet resolvers use the public delegation. Verify an internal resolver returns the private endpoint while public queries return the internet-facing address.

Inbound endpoints bring permitted DNS queries into the VPC resolver, unlike outbound endpoints sending them out. The needed control instead targets split-horizon DNS can use a public hosted zone and an associated private hosted zone for the same namespace; it succeeds when an internal resolver returns the private endpoint while public queries return the internet-facing address.

Private PKI establishes internal identity only when clients explicitly trust its CA chain. That adjustment does not address the controlling condition: private routing reduces exposure to public internet paths but does not independently encrypt packet payloads. Verify packet observations along the hybrid link cannot reveal sensitive application contents.

Possession of the server private key enables impersonation even when its certificate is public. The needed control instead targets Direct Connect dedicated private transport alone does not guarantee confidentiality of application data in transit; it succeeds when packet observations along the hybrid link cannot reveal sensitive application contents.

IPsec protects network traffic on untrusted transport independently of application-layer encryption. It does not directly achieve the required result: packet observations along the hybrid link cannot reveal sensitive application contents. The constraint is that private routing reduces exposure to public internet paths but does not independently encrypt packet payloads.

Publicly visible hosted-zone NS addresses do not expose the private record namespace on the internet. It does not directly achieve the required result: the corporate DNS server can exchange permitted queries and responses with the inbound endpoint. The constraint is that endpoint IP reachability depends on network security beyond resolver forwarding configuration.

A single DNS endpoint address can become an availability bottleneck and may violate service requirements. It does not directly achieve the required result: the corporate DNS server can exchange permitted queries and responses with the inbound endpoint. The constraint is that endpoint IP reachability depends on network security beyond resolver forwarding configuration.

A forwarding rule controls names but does not increase packet-processing capacity by itself. It does not directly achieve the required result: the corporate DNS server can exchange permitted queries and responses with the inbound endpoint. The constraint is that endpoint IP reachability depends on network security beyond resolver forwarding configuration.

Overbroad BGP originations can redirect corporate traffic beyond intended AWS destinations. The decisive technical distinction is BGP adjacency over a Direct Connect VIF depends on correctly assigned local and AWS peer addressing; a router talking to its own address or an incorrect peer cannot establish the required TCP BGP session.

Private circuit establishment alone does not provision vendor encryption or control-plane overlays. The decisive technical distinction is BGP adjacency over a Direct Connect VIF depends on correctly assigned local and AWS peer addressing; a router talking to its own address or an incorrect peer cannot establish the required TCP BGP session.

Physical patching requires explicit connection identification and authorized facility coordination. That property alone cannot account for the reported symptom; a router talking to its own address or an incorrect peer cannot establish the required TCP BGP session.

A healthy NLB can still direct clients to overloaded targets when the target fleet is undersized. That adjustment does not address the controlling condition: a nominal bandwidth rating alone does not establish packet-processing performance for tiny packets. Verify packets per second and packet loss meet the workload SLO after instance sizing.

A driver refresh does not increase the instance type’s fixed networking performance envelope; the team must size for measured packet-per-second demand.

Target discovery must follow workload life cycle to avoid forwarding to stopped or obsolete tasks. The needed control instead targets instance network performance limits can include packet rate, flow count and bandwidth dimensions; it succeeds when packets per second and packet loss meet the workload SLO after instance sizing.

Connecting attachments to the same Transit Gateway does not by itself permit every attachment to reach every other. For the stated conditions, stateful middleboxes require both directions of a connection to traverse compatible inspection state. The more specific mechanism is Transit Gateway appliance mode can preserve flow affinity through a VPC attachment used for stateful inspection.

Hub connectivity can be segmented by controlling routes advertised to each attachment's associated table. The decisive technical distinction is Transit Gateway appliance mode can preserve flow affinity through a VPC attachment used for stateful inspection; stateful middleboxes require both directions of a connection to traverse compatible inspection state.

Each peer must route the remote CIDR explicitly; peering does not act as a universal router. The reported evidence instead concerns Transit Gateway appliance mode can preserve flow affinity through a VPC attachment used for stateful inspection: stateful middleboxes require both directions of a connection to traverse compatible inspection state.

A broad transit route need not divert packets matching a more-specific valid local route. For the stated conditions, resource participation does not transfer ownership of route tables or subnet-level network policy. The more specific mechanism is in VPC sharing, the VPC owner retains controls for shared networking components.

Unidirectional route configuration can lead to failed return traffic even when peering is active. For the stated conditions, resource participation does not transfer ownership of route tables or subnet-level network policy. The more specific mechanism is in VPC sharing, the VPC owner retains controls for shared networking components.

An attached TGW does not automatically redirect packets that a VPC subnet table sends elsewhere. That property alone cannot account for the reported symptom; resource participation does not transfer ownership of route tables or subnet-level network policy.

Creating a rule on a shared outbound endpoint does not cause every VPC to use it automatically. The reported evidence instead concerns Route 53 Resolver endpoint HA requires multiple endpoint IP addresses in appropriate Availability Zones: a single DNS endpoint address can become an availability bottleneck and may violate service requirements.

Inbound and outbound endpoint directions describe where queries enter or leave the VPC DNS service. The reported evidence instead concerns Route 53 Resolver endpoint HA requires multiple endpoint IP addresses in appropriate Availability Zones: a single DNS endpoint address can become an availability bottleneck and may violate service requirements.

A single rule cannot simultaneously express different target destinations for the same suffix without planning. For the stated conditions, a single DNS endpoint address can become an availability bottleneck and may violate service requirements. The more specific mechanism is Route 53 Resolver endpoint HA requires multiple endpoint IP addresses in appropriate Availability Zones.