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A domain registrar holds a DS record pointing to an old KSK after the public hosted zone starts signing with a new key. Validating recursive resolvers fail while nonvalidating tools can sometimes retrieve the underlying DNS records. What DNSSEC operational failure is being demonstrated?
DNSSEC validation requires the parent DS to match the active zone-signing trust chain; stale parent material can break secure resolution.
That outcome depends on route 53 resolver inbound endpoint deployment, whose mechanism is different: An inbound resolver accepts queries from outside the VPC and resolves the associated private namespace without publishing the records to the public internet. The reported defect concerns dnssec public-zone validation and signing.
This is a risk in cross-account private hosted zone association: Private hosted-zone DNS answers are scoped to associated VPCs; cross-account use requires explicit authorization and association. It does not account for the dnssec public-zone validation and signing fault stated in this incident.
That outcome depends on split-horizon dns precedence troubleshooting, whose mechanism is different: VPC Resolver selects eligible private namespaces and forwarding rules based on match and association; public records need not be consulted when a matching private zone exists. The reported defect concerns dnssec public-zone validation and signing.
A multi-team IaC repository contains duplicated security-group and subnet code that diverges between service deployments.
Which AWS networking configuration best addresses this specific requirement?
AWS CDK turns supported imperative-language constructs into deployable CloudFormation infrastructure definitions, enabling standard reusable network patterns. The proposed change can be checked by whether synthesized templates and resulting stacks match approved network boundaries and automated policy checks reject forbidden configurations.
This configuration addresses eventbridge-driven network remediation, not the aws cdk secure network constructs requirement. EventBridge can route management events to automation targets while CloudTrail records the underlying API activity and IAM restricts what automation may alter.
This configuration addresses cloudformation parameterized vpc deployment, not the aws cdk secure network constructs requirement. Declarative infrastructure templates create repeatable network resources while parameters and outputs separate environment-specific values from resource definitions.
This configuration addresses multi-account network automation role boundaries, not the aws cdk secure network constructs requirement. STS role assumption grants temporary credentials limited by role trust and permissions, separating pipeline identity from persistent account-level root access.
A private hosted zone shadows a public DNS name and AWS workloads receive unexpected internal answers.
Which technical explanation best accounts for the network behavior described?
VPC Resolver selects eligible private namespaces and forwarding rules based on match and association; public records need not be consulted when a matching private zone exists. A direct check is to inspect private hosted-zone associations and most-specific match rules, then correct split-horizon zone content or forwarding precedence and observe the corresponding path.
DNSSEC establishes a chain of trust from a parent DS record to the child zone's signing keys, allowing validating resolvers to reject forged answers. That is a valid account of dnssec public-zone validation and signing, but it does not explain the split-horizon dns precedence troubleshooting behavior in the scenario.
Private hosted-zone DNS answers are scoped to associated VPCs; cross-account use requires explicit authorization and association. That is a valid account of cross-account private hosted zone association, but it does not explain the split-horizon dns precedence troubleshooting behavior in the scenario.
Resolver forwarding rule selection depends on matching domain names and VPC association; endpoints alone do not select where matching DNS queries go. That is a valid account of route 53 resolver outbound rule association, but it does not explain the split-horizon dns precedence troubleshooting behavior in the scenario.
A high-throughput analytics host cannot achieve its expected network bandwidth after moving to a small legacy EC2 instance type.
Which observation would most directly demonstrate the required network outcome?
End-to-end throughput and pps tests meet workload demand on the supported instance size without unacceptable retransmission. That is relevant because elastic Network Adapter supports enhanced network performance on compatible instance types, while achievable bandwidth also depends on instance size.
This would validate global accelerator latency and failover optimization. The case instead needs evidence for eni performance instance network capability: End-to-end throughput and pps tests meet workload demand on the supported instance size without unacceptable retransmission.
This would validate nat gateway data-processing cost reduction. The case instead needs evidence for eni performance instance network capability: End-to-end throughput and pps tests meet workload demand on the supported instance size without unacceptable retransmission.
This would validate ipam and vpc cidr growth planning. The case instead needs evidence for eni performance instance network capability: End-to-end throughput and pps tests meet workload demand on the supported instance size without unacceptable retransmission.
A PrivateLink provider intends to restrict an endpoint service to one partner account. The provider recently granted `*` as an allowed principal during a test and forgot to remove it. What is the least-privilege corrective action?
Endpoint-service allowed principals determine which accounts may request service connections; a wildcard unnecessarily expands that trust boundary.
Public routing further widens exposure and does not correct endpoint-service authorization.
Renaming does not restrict the principals authorized to create endpoints.
Target health has no bearing on who is authorized to request the service.
A Resolver forwarding rule shared via AWS RAM is correctly associated with an application VPC. Its outbound endpoint exists, but the networking TGW's return route to the corporate DNS servers is missing. Which change restores corporate name lookups without altering the existing rule scope?
Rule association chooses the namespace's DNS policy; reachability to the target DNS service is still needed for both query and response packets.
Repeating an existing association does not fix the routing failure.
Public publishing changes the required private namespace security model.
A rule label does not forward DNS requests around a missing return route.
A network engineer has approved a dedicated Direct Connect port and received a letter of authorization but has not completed the colocation cross-connect.
Which AWS networking configuration best addresses this specific requirement?
Direct Connect connectivity depends on the physical handoff and correct virtual-interface BGP parameters; a physical optical link alone does not establish routed VPC access. The proposed change can be checked by whether connection, VIF and BGP state report healthy and an approved on-premises prefix reaches the intended private VPC target bidirectionally.
This configuration addresses redundant vpn tunnels with bgp failover, not the direct connect physical provisioning and bgp bring-up requirement. Site-to-Site VPN supplies redundant tunnels, but failover depends on compatible dynamic routing and healthy peer sessions for both tunnel paths.
This configuration addresses hybrid path mtu and fragmentation, not the direct connect physical provisioning and bgp bring-up requirement. Different media and IPsec encapsulation consume packet overhead; Path MTU Discovery or adjusted TCP MSS prevents oversized packets from being silently lost.
This configuration addresses customer gateway bgp asn coordination, not the direct connect physical provisioning and bgp bring-up requirement. BGP peers must agree on neighbor addressing and expected autonomous systems before they can exchange dynamic routes over the encrypted tunnel.
A Resolver query-log configuration is shared across AWS accounts through an approved mechanism. A consumer VPC is not associated with that configuration. Which collection rule explains why its DNS queries are absent from the central destination?
Central log permissions and per-VPC query collection scope are separate configuration conditions.
An organization-wide destination does not implicitly associate every VPC with the configuration.
Network flow logging is not a substitute for Resolver query-log association.
Resolver query logging is designed for supported DNS queries from associated VPCs.
A branch’s dynamic-routing VPN uses two tunnels. Engineers observe that they configured only one customer gateway BGP neighbor, so scheduled maintenance on that tunnel disconnects all applications. What should the redundant hybrid design require?
A spare tunnel gives recovery only when it can negotiate and exchange usable routes after the preferred path fails.
Documentation cannot substitute for real BGP and IPsec configuration.
A single dependent interface leaves the same common failure point.
Edge content authorization does not create a viable backup hybrid tunnel.
A company has dedicated private fiber to AWS but its security standard requires IPsec protection for regulated application data.
Which observation would most directly demonstrate the required network outcome?
A supported cryptographic validation proves traffic uses an approved cipher and endpoint identities while remaining on the intended path. That is relevant because direct Connect is a dedicated network connection but does not universally encrypt payloads; IPsec or TLS adds cryptographic confidentiality when configured.
This would validate alb acm certificate managed tls. The case instead needs evidence for vpn encryption over direct connect: A supported cryptographic validation proves traffic uses an approved cipher and endpoint identities while remaining on the intended path.
This would validate cloudfront https viewer and origin settings. The case instead needs evidence for vpn encryption over direct connect: A supported cryptographic validation proves traffic uses an approved cipher and endpoint identities while remaining on the intended path.
This would validate tls end-to-end and nlb passthrough choice. The case instead needs evidence for vpn encryption over direct connect: A supported cryptographic validation proves traffic uses an approved cipher and endpoint identities while remaining on the intended path.
An AWS Site-to-Site VPN reports IPsec UP but BGP remains Down. The on-premises router's configured BGP neighbor inside address differs from the AWS tunnel configuration. Why are the private routes unavailable despite working encryption transport?
IPsec transport and BGP control-plane adjacency are separate; the incorrect neighbor address prevents the routing session.
An encrypted tunnel may be up while its BGP session remains down.
DNS selection is unrelated to BGP neighbor configuration.
Security groups do not rewrite router BGP peer configuration.
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