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Select private VIFs for supported VPC private reachability and public VIFs for AWS public service prefixes or appropriate VPN endpoints, with permitted route policy. This choice relates to Direct Connect private and public VIF selection, not the complementary response and evidence pair for the case. Prefer: Use Transit Gateway Connect attachments with GRE and BGP for supported SD-WAN appliance integration and define matching routing and appliance readiness. Confirm with: Examine Connect peer IPs, GRE tunnels, BGP neighbors, Transit Gateway associations and propagated routes. Scenario: An engineer establishes GRE tunnels to a Connect attachment but forgets to configure BGP peering, leaving remote routes absent.

Eligible requests fail over to a healthy secondary origin without treating unsupported request methods as automatically retried. This choice relates to CloudFront origin groups and failover behavior, not the complementary response and evidence pair for the case. Prefer: Use Transit Gateway Connect attachments with GRE and BGP for supported SD-WAN appliance integration and define matching routing and appliance readiness. Confirm with: Examine Connect peer IPs, GRE tunnels, BGP neighbors, Transit Gateway associations and propagated routes. Scenario: An engineer establishes GRE tunnels to a Connect attachment but forgets to configure BGP peering, leaving remote routes absent.

Inspect BGP neighbor state, received and advertised routes, prefix filters, path attributes and chosen best paths on both sides. This choice relates to BGP route advertisements and traffic engineering, not the complementary response and evidence pair for the case. Prefer: Use Transit Gateway Connect attachments with GRE and BGP for supported SD-WAN appliance integration and define matching routing and appliance readiness. Confirm with: Examine Connect peer IPs, GRE tunnels, BGP neighbors, Transit Gateway associations and propagated routes. Scenario: An engineer establishes GRE tunnels to a Connect attachment but forgets to configure BGP peering, leaving remote routes absent.

Correlate API eventName/principal/time/resource, Flow Log ENI/action/ports, affected route table and change records. These checks are primarily associated with CloudTrail control-plane events versus Flow Logs traffic evidence; they are less discriminating for this case. The relevant checks are: Verify record format, start/end aggregation periods, flow direction, tcp-flags, action, log-status and delivery permissions. Scenario: A team queries a five-minute aggregation record and claims its byte count identifies the exact request body exfiltrated by one client.

Review viewer protocol policy, origin protocol policy, CloudFront access logs, certificate associations and origin permission settings. These checks are primarily associated with CloudFront HTTPS policies and origin security; they are less discriminating for this case. The relevant checks are: Verify record format, start/end aggregation periods, flow direction, tcp-flags, action, log-status and delivery permissions. Scenario: A team queries a five-minute aggregation record and claims its byte count identifies the exact request body exfiltrated by one client.

Review organizational scope, policy type, resource inclusion, remediation state, compliance findings and delegated administrator status. These checks are primarily associated with AWS Firewall Manager organization-wide audit; they are less discriminating for this case. The relevant checks are: Verify record format, start/end aggregation periods, flow direction, tcp-flags, action, log-status and delivery permissions. Scenario: A team queries a five-minute aggregation record and claims its byte count identifies the exact request body exfiltrated by one client.

Use supported VPC endpoint policies, identity policies and SG restrictions to govern access to AWS services without unrestricted internet traversal. This choice relates to Endpoint policies and least-privilege private egress, not the complementary response and evidence pair for the case. Prefer: Implement Gateway Load Balancer endpoint traffic steering into compatible third-party inspection appliances with high availability and flow symmetry. Confirm with: Inspect GWLBe subnet routes, GWLB target health, GENEVE tunnel behavior, appliance state and AZ-specific return paths. Scenario: A design places all inspection traffic through one AZ despite service requirements to continue during that AZ's failure.

Inspect SG inbound/outbound permissions, NACL ordered entries, ephemeral response ports, flow logs and approved test connections. This choice relates to Stateful security groups and stateless network ACLs, not the complementary response and evidence pair for the case. Prefer: Implement Gateway Load Balancer endpoint traffic steering into compatible third-party inspection appliances with high availability and flow symmetry. Confirm with: Inspect GWLBe subnet routes, GWLB target health, GENEVE tunnel behavior, appliance state and AZ-specific return paths. Scenario: A design places all inspection traffic through one AZ despite service requirements to continue during that AZ's failure.

Clients authenticate the correct hostname and negotiate supported TLS securely, with backend encryption handled as independently required. This choice relates to TLS listener certificates and ACM lifecycle, not the complementary response and evidence pair for the case. Prefer: Implement Gateway Load Balancer endpoint traffic steering into compatible third-party inspection appliances with high availability and flow symmetry. Confirm with: Inspect GWLBe subnet routes, GWLB target health, GENEVE tunnel behavior, appliance state and AZ-specific return paths. Scenario: A design places all inspection traffic through one AZ despite service requirements to continue during that AZ's failure.

Both directions of inspected flows traverse intended healthy appliances without creating asymmetric stateful session failures. This choice relates to Gateway Load Balancer centralized inspection and symmetry, not the complementary response and evidence pair for the case. Prefer: Enforce HTTPS viewer policies and origin protocol policies on a CloudFront distribution, using trusted origin certificates and least-privilege origin access. Confirm with: Review viewer protocol policy, origin protocol policy, CloudFront access logs, certificate associations and origin permission settings. Scenario: A web team enforces HTTPS but leaves its S3 content bucket publicly readable, so viewers can bypass the CDN's signed URL restrictions.

Check key-signing key state, DNSKEY and DS chains, validator responses, zone type and registrar delegation records. This choice relates to Route 53 DNSSEC signing and resolver trust, not the complementary response and evidence pair for the case. Prefer: Enforce HTTPS viewer policies and origin protocol policies on a CloudFront distribution, using trusted origin certificates and least-privilege origin access. Confirm with: Review viewer protocol policy, origin protocol policy, CloudFront access logs, certificate associations and origin permission settings. Scenario: A web team enforces HTTPS but leaves its S3 content bucket publicly readable, so viewers can bypass the CDN's signed URL restrictions.

Use ACM Private Certificate Authority where appropriate for private PKI and managed service-to-service TLS identities with restricted issuance and rotation. This choice relates to AWS Private CA service-to-service TLS and rotation, not the complementary response and evidence pair for the case. Prefer: Enforce HTTPS viewer policies and origin protocol policies on a CloudFront distribution, using trusted origin certificates and least-privilege origin access. Confirm with: Review viewer protocol policy, origin protocol policy, CloudFront access logs, certificate associations and origin permission settings. Scenario: A web team enforces HTTPS but leaves its S3 content bucket publicly readable, so viewers can bypass the CDN's signed URL restrictions.

Inspect subnet available address counts, network interface consumption, load balancer scale events, CNI IP allocation and VPC CIDR associations. This choice relates to VPC subnet IP address exhaustion and growth, not the complementary response and evidence pair for the case. Prefer: Evaluate cross-AZ, cross-Region, NAT gateway, VPN and Direct Connect data transfer charges against measured traffic and routing needs. Confirm with: Examine current architecture, bytes per direction, AZ placement, NAT processing rates, Direct Connect port charges and published pricing dimensions. Scenario: An engineering team proposes moving every workload into one AZ to avoid cross-AZ charges despite a strict high-availability requirement.

Select CloudFront to cache eligible content and Global Accelerator to optimize supported TCP/UDP ingress and health-based regional endpoint paths. This choice relates to CloudFront caching versus Global Accelerator network optimization, not the complementary response and evidence pair for the case. Prefer: Evaluate cross-AZ, cross-Region, NAT gateway, VPN and Direct Connect data transfer charges against measured traffic and routing needs. Confirm with: Examine current architecture, bytes per direction, AZ placement, NAT processing rates, Direct Connect port charges and published pricing dimensions. Scenario: An engineering team proposes moving every workload into one AZ to avoid cross-AZ charges despite a strict high-availability requirement.

The network configuration contains an allowed logical path where intended, and live tests confirm service responsiveness independently. This choice relates to Reachability Analyzer static configuration diagnosis, not the complementary response and evidence pair for the case. Prefer: Evaluate cross-AZ, cross-Region, NAT gateway, VPN and Direct Connect data transfer charges against measured traffic and routing needs. Confirm with: Examine current architecture, bytes per direction, AZ placement, NAT processing rates, Direct Connect port charges and published pricing dimensions. Scenario: An engineering team proposes moving every workload into one AZ to avoid cross-AZ charges despite a strict high-availability requirement.

Deploy accessible Route 53 Resolver inbound endpoints and conditional on-premises forwarding when corporate DNS must query names in AWS private zones. That approach addresses Route 53 Resolver inbound endpoint for on-premises queries instead of the principal requirement here. Resolver inbound endpoints accept forwarded queries into VPC DNS; they do not themselves forward arbitrary VPC queries to an on-premises name server. The better fit for this scenario is: Select Route 53 failover, weighted, latency or geolocation routing based on explicit objective, and pair failover records with supported health evaluation. Scenario: A multi-region web app uses weighted records to split an experiment and assumes 50 percent of individual HTTP requests must arrive at each region.

Associate a Route 53 private hosted zone with each intended VPC, including controlled cross-account association, and avoid assuming public resolvers see it. That approach addresses Private hosted zones and VPC associations instead of the principal requirement here. A private hosted zone is a resolver visibility scope, not a global public DNS zone or a transitively shared VPC setting. The better fit for this scenario is: Select Route 53 failover, weighted, latency or geolocation routing based on explicit objective, and pair failover records with supported health evaluation. Scenario: A multi-region web app uses weighted records to split an experiment and assumes 50 percent of individual HTTP requests must arrive at each region.

Configure listener-to-target-group forwarding, suitable instance or IP targets, and application-specific health checks before routing production traffic. That approach addresses Load balancer target groups and health gating instead of the principal requirement here. A target group healthy result depends on its configured probe, not on the operator manually declaring the EC2 instance running. The better fit for this scenario is: Select Route 53 failover, weighted, latency or geolocation routing based on explicit objective, and pair failover records with supported health evaluation. Scenario: A multi-region web app uses weighted records to split an experiment and assumes 50 percent of individual HTTP requests must arrive at each region.

Combine CloudWatch tunnel and link metrics with Network Manager topology and route-change context for multi-site incident triage. That approach addresses CloudWatch and Network Manager hybrid incident telemetry instead of the principal requirement here. Control-plane service graphs and metric dashboards are complementary but do not replace active checks across the actual business traffic path. The better fit for this scenario is: Maintain interface endpoints and provider endpoint services, monitoring acceptance, DNS, endpoint ENI and health as accounts and subnet memberships change. Scenario: A provider rotates the load balancer behind an endpoint service and consumers report that private DNS still resolves but TCP resets occur.

Maintain Transit Gateway attachment associations and propagated/static routes while preventing blackholes and cross-environment route leakage. That approach addresses Transit Gateway route changes and blackhole prevention instead of the principal requirement here. Route propagation and route-table association are separate operations; a more-specific static route may override a broader propagated path. The better fit for this scenario is: Maintain interface endpoints and provider endpoint services, monitoring acceptance, DNS, endpoint ENI and health as accounts and subnet memberships change. Scenario: A provider rotates the load balancer behind an endpoint service and consumers report that private DNS still resolves but TCP resets occur.

Use VPC Reachability Analyzer to evaluate a defined source and destination against supported network topology and configuration, then validate actual applications separately. That approach addresses Reachability Analyzer static configuration diagnosis instead of the principal requirement here. Reachability Analyzer performs configuration-based path analysis; a reachable path does not guarantee a process accepts connections or a DNS name resolves. The better fit for this scenario is: Maintain interface endpoints and provider endpoint services, monitoring acceptance, DNS, endpoint ENI and health as accounts and subnet memberships change. Scenario: A provider rotates the load balancer behind an endpoint service and consumers report that private DNS still resolves but TCP resets occur.

Inspect listener certificates and policies, backend protocol, negotiated versions, target TLS configuration and end-to-end packet paths. This choice relates to TLS termination and backend encryption with load balancers, not the complementary response and evidence pair for the case. Prefer: Use Route 53 alias records for supported AWS endpoints, including hosted-zone apex names, rather than relying on a prohibited apex CNAME. Confirm with: Check record type and alias target, hosted-zone scope, evaluate-target-health setting and resolved endpoint addresses. Scenario: A company needs example.net to resolve to a public Application Load Balancer and its DNS tool rejects an ordinary CNAME at the root label.

Designated traffic reaches healthy inline appliances and return traffic follows a compatible symmetric inspection path. This choice relates to Gateway Load Balancer appliances and GENEVE, not the complementary response and evidence pair for the case. Prefer: Use Route 53 alias records for supported AWS endpoints, including hosted-zone apex names, rather than relying on a prohibited apex CNAME. Confirm with: Check record type and alias target, hosted-zone scope, evaluate-target-health setting and resolved endpoint addresses. Scenario: A company needs example.net to resolve to a public Application Load Balancer and its DNS tool rejects an ordinary CNAME at the root label.

Configure Route 53 Resolver outbound endpoints with conditional forwarding rules for on-premises domains from associated VPCs. This choice relates to Route 53 Resolver outbound endpoint for corporate domains, not the complementary response and evidence pair for the case. Prefer: Use Route 53 alias records for supported AWS endpoints, including hosted-zone apex names, rather than relying on a prohibited apex CNAME. Confirm with: Check record type and alias target, hosted-zone scope, evaluate-target-health setting and resolved endpoint addresses. Scenario: A company needs example.net to resolve to a public Application Load Balancer and its DNS tool rejects an ordinary CNAME at the root label.

Create Route 53 Resolver outbound endpoint forwarding rules for intended internal domain suffixes and associate rules with every consuming VPC. That approach addresses Resolver outbound rule with conditional corporate forwarding instead of the principal requirement here. Outbound Resolver endpoints initiate DNS forwarding from AWS VPCs; an inbound endpoint alone does not redirect AWS-origin queries to corporate DNS. The better fit for this scenario is: Configure interface endpoints for supported services or provider endpoint services, including endpoint policy or acceptance and private DNS where available. Scenario: A contractor needs private access to one partner-hosted billing API despite overlapping CIDRs, but its team tries to add reciprocal TGW routes.

Share supported Transit Gateway attachments or subnets through AWS RAM with correct organization and account authorization and maintain central network ownership. That approach addresses AWS RAM shared networking across accounts instead of the principal requirement here. Sharing a TGW or VPC subnet delegates specific resource use, not blanket administrator rights over the network owner's resources. The better fit for this scenario is: Configure interface endpoints for supported services or provider endpoint services, including endpoint policy or acceptance and private DNS where available. Scenario: A contractor needs private access to one partner-hosted billing API despite overlapping CIDRs, but its team tries to add reciprocal TGW routes.

Configure supported Route 53 routing policies and records with stable identifiers, expected health checks, weights or latency policies and appropriate TTLs. That approach addresses Weighted latency and failover Route 53 records instead of the principal requirement here. Route 53 weighted DNS divides answered queries probabilistically, not individual TCP sessions or exact HTTP request shares. The better fit for this scenario is: Configure interface endpoints for supported services or provider endpoint services, including endpoint policy or acceptance and private DNS where available. Scenario: A contractor needs private access to one partner-hosted billing API despite overlapping CIDRs, but its team tries to add reciprocal TGW routes.

Configure both AWS Site-to-Site VPN tunnels with appropriate BGP or supported static prefixes and validate routing failover on each customer gateway. This choice relates to Site-to-Site VPN two tunnel routing, not the complementary response and evidence pair for the case. Prefer: Provision a Direct Connect connection through the authorized location, complete cross-connect paperwork, and configure VIF VLAN tagging and compatible BGP peering. Confirm with: Check LOA-CFA status, physical port light levels, assigned VLAN, BGP peer IPs, ASN and accepted prefix advertisements. Scenario: A team receives the AWS Direct Connect LOA and assumes its private CIDRs are reachable before installing the cross-connect or BGP session.

Check transport attachment, Connect peer GRE outer IPs, inside BGP address allocation, advertised routes and TGW routing tables. This choice relates to Transit Gateway Connect peer implementation, not the complementary response and evidence pair for the case. Prefer: Provision a Direct Connect connection through the authorized location, complete cross-connect paperwork, and configure VIF VLAN tagging and compatible BGP peering. Confirm with: Check LOA-CFA status, physical port light levels, assigned VLAN, BGP peer IPs, ASN and accepted prefix advertisements. Scenario: A team receives the AWS Direct Connect LOA and assumes its private CIDRs are reachable before installing the cross-connect or BGP session.

Approved environments deploy repeatable unique networks with changes reviewed before impact and conflicts detected early. This choice relates to CloudFormation parameterized network templates, not the complementary response and evidence pair for the case. Prefer: Provision a Direct Connect connection through the authorized location, complete cross-connect paperwork, and configure VIF VLAN tagging and compatible BGP peering. Confirm with: Check LOA-CFA status, physical port light levels, assigned VLAN, BGP peer IPs, ASN and accepted prefix advertisements. Scenario: A team receives the AWS Direct Connect LOA and assumes its private CIDRs are reachable before installing the cross-connect or BGP session.

Establish CloudWatch alarms and dashboards for measured packet loss, target errors, throughput and connectivity indicators with meaningful baselines. That approach addresses CloudWatch alarm baselines for network health instead of the principal requirement here. CloudWatch alarms evaluate metric streams over periods; a green dashboard does not verify an absent metric is collecting meaningful data. The better fit for this scenario is: Enable supported edge and load-balancer access logs with coherent time conventions and controlled central collection for troubleshooting. Scenario: CloudFront returns successful cached objects during an origin outage, and analysts mistakenly infer from missing ALB requests that no users accessed the site.

Design Transit Gateway peering between supported Regions with explicit static routing where required and avoid assuming route propagation across peering. That approach addresses Inter-Region Transit Gateway peering routes instead of the principal requirement here. TGW peering does not propagate remote routes automatically; inter-Region reachability requires appropriate routing on both sides. The better fit for this scenario is: Enable supported edge and load-balancer access logs with coherent time conventions and controlled central collection for troubleshooting. Scenario: CloudFront returns successful cached objects during an origin outage, and analysts mistakenly infer from missing ALB requests that no users accessed the site.

Configure VPC Traffic Mirroring with a supported source ENI and destination for packet-oriented analysis when detailed headers are required. That approach addresses VPC Traffic Mirroring packet-level design instead of the principal requirement here. Traffic Mirroring provides packet copies for supported resources; it is distinct from aggregated metadata records in VPC Flow Logs. The better fit for this scenario is: Enable supported edge and load-balancer access logs with coherent time conventions and controlled central collection for troubleshooting. Scenario: CloudFront returns successful cached objects during an origin outage, and analysts mistakenly infer from missing ALB requests that no users accessed the site.