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Inspect event pattern and detail, Lambda IAM role, idempotency key, retry/DLQ policy, logged action and configuration outcome. These checks are primarily associated with EventBridge and Lambda network change reaction; they are less discriminating for this case. The relevant checks are: Compare CDK context values, synthesized resources, environment references, stack dependencies and deployed change sets. Scenario: A CDK stack references a staging VPC ID in production because its context file was copied without environment-aware configuration.

Check LOA-CFA status, physical port light levels, assigned VLAN, BGP peer IPs, ASN and accepted prefix advertisements. These checks are primarily associated with Direct Connect LOA VLAN and BGP bring-up; they are less discriminating for this case. The relevant checks are: Compare CDK context values, synthesized resources, environment references, stack dependencies and deployed change sets. Scenario: A CDK stack references a staging VPC ID in production because its context file was copied without environment-aware configuration.

Validate inbound endpoint addresses, network routing, on-prem conditional DNS forwarder configuration, zone association and resolver query logs. These checks are primarily associated with Resolver inbound endpoint for AWS private zone access; they are less discriminating for this case. The relevant checks are: Compare CDK context values, synthesized resources, environment references, stack dependencies and deployed change sets. Scenario: A CDK stack references a staging VPC ID in production because its context file was copied without environment-aware configuration.

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: Select CloudFront to cache eligible content and Global Accelerator to optimize supported TCP/UDP ingress and health-based regional endpoint paths. Scenario: An interactive TCP service with proprietary framing needs stable entry IPs and faster global routing, but CloudFront caching is proposed for an incompatible protocol.

Choose supported Elastic Network Adapter or Elastic Fabric Adapter options according to latency, high-performance computing placement and workload requirements. That approach addresses ENA EFA and network-adapter performance selection instead of the principal requirement here. ENA supports enhanced networking for general EC2; EFA targets HPC/ML inter-node communication and requires supported instance and deployment characteristics. The better fit for this scenario is: Select CloudFront to cache eligible content and Global Accelerator to optimize supported TCP/UDP ingress and health-based regional endpoint paths. Scenario: An interactive TCP service with proprietary framing needs stable entry IPs and faster global routing, but CloudFront caching is proposed for an incompatible protocol.

Use supported Transit Gateway multicast domains and compatible VPC attachments when multicast applications require governed AWS routing, with explicit support checks. That approach addresses Transit Gateway multicast and routing limitations instead of the principal requirement here. AWS Transit Gateway multicast functionality has distinct feature limits and does not turn every traditional on-premises multicast routing protocol into an automatically supported end-to-end domain. The better fit for this scenario is: Select CloudFront to cache eligible content and Global Accelerator to optimize supported TCP/UDP ingress and health-based regional endpoint paths. Scenario: An interactive TCP service with proprietary framing needs stable entry IPs and faster global routing, but CloudFront caching is proposed for an incompatible protocol.

Apply least-privilege security groups to ENIs and deliberate subnet network ACL rules while accounting for stateful return behavior and stateless ephemeral ports. That approach addresses Stateful security groups and stateless network ACLs instead of the principal requirement here. Security groups are stateful and NACLs stateless; a NACL must explicitly allow required traffic directions and ephemeral return ports. The better fit for this scenario is: Combine CloudTrail API activity with VPC Flow Logs metadata to investigate who changed network resources and how traffic behaved afterward. Scenario: An organization sees a sudden security group exposure but reviews only Flow Logs and cannot determine which IAM principal opened the inbound rule.

Use AWS Firewall Manager with supported organization integration to apply and audit consistent WAF or network firewall policy across in-scope accounts and resources. That approach addresses AWS Firewall Manager organization-wide audit instead of the principal requirement here. A central Firewall Manager policy can find and remediate deviations according to configuration; it is not automatically a packet inspection endpoint. The better fit for this scenario is: Combine CloudTrail API activity with VPC Flow Logs metadata to investigate who changed network resources and how traffic behaved afterward. Scenario: An organization sees a sudden security group exposure but reviews only Flow Logs and cannot determine which IAM principal opened the inbound rule.

Use supported CloudWatch Logs metric filters, alarms and event processing to alert on network policy violations with sufficient context and tuning. That approach addresses CloudWatch log metric filters and cross-source alert correlation instead of the principal requirement here. A filter matching one API event is not a packet firewall; log processing and alert signals must be tested against actual source logs and missing-data behavior. The better fit for this scenario is: Combine CloudTrail API activity with VPC Flow Logs metadata to investigate who changed network resources and how traffic behaved afterward. Scenario: An organization sees a sudden security group exposure but reviews only Flow Logs and cannot determine which IAM principal opened the inbound rule.

The synthesized network design matches the intended account and Region and avoids accidental production replacements. That result supports AWS CDK network configuration and environment context but does not establish the requested networking outcome here. Instead verify: Approved client VPCs reach just the desired private service without requiring public internet or full network peering. Scenario: An endpoint service owner requires manual acceptance, yet a consumer treats the initial pendingAcceptance state as an active private connection.

Approved hybrid flows use negotiated IPsec encryption and recover through an intentionally tested alternate path. That result supports VPN over Direct Connect for encrypted hybrid connectivity but does not establish the requested networking outcome here. Instead verify: Approved client VPCs reach just the desired private service without requiring public internet or full network peering. Scenario: An endpoint service owner requires manual acceptance, yet a consumer treats the initial pendingAcceptance state as an active private connection.

A precisely scoped application exchange succeeds without pretending overlapping private routes can coexist unmodified in one TGW routing domain. That result supports Overlapping CIDR workaround with service-specific endpoints but does not establish the requested networking outcome here. Instead verify: Approved client VPCs reach just the desired private service without requiring public internet or full network peering. Scenario: An endpoint service owner requires manual acceptance, yet a consumer treats the initial pendingAcceptance state as an active private connection.

Network-intensive workloads obtain measured throughput and latency without assuming a specialized HPC interface benefits ordinary web traffic. This choice relates to ENA EFA and network-adapter performance selection, not the complementary response and evidence pair for the case. Prefer: Use VPC Flow Logs and optional custom fields to correlate source, destination, traffic direction, flow action and relevant network interface. Confirm with: Inspect log scope, ENI IDs, source and destination addresses, ports, action, tcp-flags, log-status and delivery latency. Scenario: A VPC flow log delivery destination is misconfigured, so there are no fresh records despite the application's steady network traffic.

Compare alarm periods, VPN tunnel states, branch link records, TGW route metrics, change history and measured client reachability. This choice relates to CloudWatch and Network Manager hybrid incident telemetry, not the complementary response and evidence pair for the case. Prefer: Use VPC Flow Logs and optional custom fields to correlate source, destination, traffic direction, flow action and relevant network interface. Confirm with: Inspect log scope, ENI IDs, source and destination addresses, ports, action, tcp-flags, log-status and delivery latency. Scenario: A VPC flow log delivery destination is misconfigured, so there are no fresh records despite the application's steady network traffic.

Diagnose packet-size failures using trace and controlled packet tests, appropriate TCP MSS adjustment, and allowance for ICMP Packet Too Big behavior. This choice relates to Packet MTU MSS and Path MTU Discovery, not the complementary response and evidence pair for the case. Prefer: Use VPC Flow Logs and optional custom fields to correlate source, destination, traffic direction, flow action and relevant network interface. Confirm with: Inspect log scope, ENI IDs, source and destination addresses, ports, action, tcp-flags, log-status and delivery latency. Scenario: A VPC flow log delivery destination is misconfigured, so there are no fresh records despite the application's steady network traffic.

Use VPC sharing with AWS Resource Access Manager to centralize network-owner subnet management while participants deploy supported resources. That approach addresses Shared VPC subnet administration via AWS RAM instead of the principal requirement here. In VPC sharing the VPC owner controls core networking; participants cannot arbitrarily change the central VPC's network resources. The better fit for this scenario is: Design Transit Gateway peering between supported Regions with explicit static routing where required and avoid assuming route propagation across peering. Scenario: A resilience design advertises identical regional application CIDRs across peered TGWs and finds return routes ambiguous during failover.

Use Transit Gateway Connect attachments with GRE and BGP for supported SD-WAN appliance integration and define matching routing and appliance readiness. That approach addresses Transit Gateway Connect integration for SD-WAN instead of the principal requirement here. Transit Gateway Connect is not an arbitrary layer-two bridge; it overlays GRE and BGP over an underlying transport attachment. The better fit for this scenario is: Design Transit Gateway peering between supported Regions with explicit static routing where required and avoid assuming route propagation across peering. Scenario: A resilience design advertises identical regional application CIDRs across peered TGWs and finds return routes ambiguous during failover.

Use direct VPC peering for appropriate nonoverlapping VPC CIDRs and add reciprocal routes and security controls, without expecting transitive peering. That approach addresses VPC peering nontransitive routing instead of the principal requirement here. VPC peering does not support transitive routing via a third VPC; one route entry in VPC A cannot make B route onward to C. The better fit for this scenario is: Design Transit Gateway peering between supported Regions with explicit static routing where required and avoid assuming route propagation across peering. Scenario: A resilience design advertises identical regional application CIDRs across peered TGWs and finds return routes ambiguous during failover.

Review each CIDR block, required protocol/direction, endpoint DNS, NAT translations if used, and reachability verification. This choice relates to Overlapping CIDR workaround with service-specific endpoints, not the complementary response and evidence pair for the case. Prefer: Model reusable VPC and routing constructs with AWS CDK while keeping account/Region-specific values and synthesized CloudFormation templates reviewed. Confirm with: Compare CDK context values, synthesized resources, environment references, stack dependencies and deployed change sets. Scenario: A team calls a CDK construct twice with hardcoded logical IDs and stack synthesis fails before any networking changes reach AWS.

Participating accounts deploy intended attachments or resources without gaining unrestricted management of central network routing. This choice relates to AWS RAM shared networking across accounts, not the complementary response and evidence pair for the case. Prefer: Model reusable VPC and routing constructs with AWS CDK while keeping account/Region-specific values and synthesized CloudFormation templates reviewed. Confirm with: Compare CDK context values, synthesized resources, environment references, stack dependencies and deployed change sets. Scenario: A team calls a CDK construct twice with hardcoded logical IDs and stack synthesis fails before any networking changes reach AWS.

Combine supported EventBridge events and an authorized Lambda handler to react to network configuration changes with narrow automated remediation. This choice relates to EventBridge and Lambda network change reaction, not the complementary response and evidence pair for the case. Prefer: Model reusable VPC and routing constructs with AWS CDK while keeping account/Region-specific values and synthesized CloudFormation templates reviewed. Confirm with: Compare CDK context values, synthesized resources, environment references, stack dependencies and deployed change sets. Scenario: A team calls a CDK construct twice with hardcoded logical IDs and stack synthesis fails before any networking changes reach AWS.

Configure supported ALB or NLB TLS/HTTPS listeners with appropriate ACM certificates and policies and plan certificate replacement before expiry. That approach addresses TLS listener certificates and ACM lifecycle instead of the principal requirement here. A public HTTPS listener certificate authenticates the client-facing endpoint; it does not automatically encrypt an HTTP backend connection. The better fit for this scenario is: Configure DNSSEC on supported public Route 53 hosted zones and maintain correct registrar DS delegation, distinguishing signing from transport encryption. Scenario: An application team attempts to configure public DS delegation for an AWS private hosted zone that should remain visible only inside associated VPCs.

Inspect and enforce approved VPC egress or transit traffic with AWS Network Firewall stateful and stateless rule groups and appropriate route insertion. That approach addresses AWS Network Firewall stateful egress filtering instead of the principal requirement here. Deploying a firewall policy alone does not force packet paths through its endpoints; route tables and stateless/stateful processing order matter. The better fit for this scenario is: Configure DNSSEC on supported public Route 53 hosted zones and maintain correct registrar DS delegation, distinguishing signing from transport encryption. Scenario: An application team attempts to configure public DS delegation for an AWS private hosted zone that should remain visible only inside associated VPCs.

Configure supported AWS Site-to-Site VPN encryption with IKE/IPsec parameters, approved customer-gateway algorithms and monitored tunnel state for hybrid traffic. That approach addresses IPsec Site-to-Site VPN for network encryption instead of the principal requirement here. Encrypted tunnels protect traffic on their encapsulated path; an unencrypted Direct Connect physical link by itself does not fulfill an IPsec requirement. The better fit for this scenario is: Configure DNSSEC on supported public Route 53 hosted zones and maintain correct registrar DS delegation, distinguishing signing from transport encryption. Scenario: An application team attempts to configure public DS delegation for an AWS private hosted zone that should remain visible only inside associated VPCs.

A precisely scoped application exchange succeeds without pretending overlapping private routes can coexist unmodified in one TGW routing domain. That result supports Overlapping CIDR workaround with service-specific endpoints but does not establish the requested networking outcome here. Instead verify: Approved data-center prefixes reach intended VPCs through supported DX gateway associations without leaking unrelated private networks. Scenario: A networking engineer changes allowed prefixes at a DX gateway association but does not confirm corresponding advertisements on the external BGP router.

Authorized branch overlay prefixes are learned through supported Connect peer paths with inspected routing and tunnel health. That result supports Transit Gateway Connect peer implementation but does not establish the requested networking outcome here. Instead verify: Approved data-center prefixes reach intended VPCs through supported DX gateway associations without leaking unrelated private networks. Scenario: A networking engineer changes allowed prefixes at a DX gateway association but does not confirm corresponding advertisements on the external BGP router.

The VIF establishes layer-two and layer-three adjacency and exchanges only authorized networks with no VLAN collision. That result supports Direct Connect LOA VLAN and BGP bring-up but does not establish the requested networking outcome here. Instead verify: Approved data-center prefixes reach intended VPCs through supported DX gateway associations without leaking unrelated private networks. Scenario: A networking engineer changes allowed prefixes at a DX gateway association but does not confirm corresponding advertisements on the external BGP router.

Build appropriately scoped custom VPC Flow Log records including relevant packet and interface fields to correlate network policy enforcement. That approach addresses Custom VPC Flow Log fields and aggregation limits instead of the principal requirement here. Flow Logs are aggregated records with selected fields, not payload capture or guaranteed one entry per individual packet. The better fit for this scenario is: Implement Gateway Load Balancer endpoint traffic steering into compatible third-party inspection appliances with high availability and flow symmetry. Scenario: An engineer replaces one inspection appliance but forgets to register the new target into the GWLB target group.

Enforce HTTPS viewer policies and origin protocol policies on a CloudFront distribution, using trusted origin certificates and least-privilege origin access. That approach addresses CloudFront HTTPS policies and origin security instead of the principal requirement here. Redirect-to-HTTPS at the viewer edge does not prove CloudFront is also using HTTPS to the origin. The better fit for this scenario is: Implement Gateway Load Balancer endpoint traffic steering into compatible third-party inspection appliances with high availability and flow symmetry. Scenario: An engineer replaces one inspection appliance but forgets to register the new target into the GWLB target group.

Inspect and enforce approved VPC egress or transit traffic with AWS Network Firewall stateful and stateless rule groups and appropriate route insertion. That approach addresses AWS Network Firewall stateful egress filtering instead of the principal requirement here. Deploying a firewall policy alone does not force packet paths through its endpoints; route tables and stateless/stateful processing order matter. The better fit for this scenario is: Implement Gateway Load Balancer endpoint traffic steering into compatible third-party inspection appliances with high availability and flow symmetry. Scenario: An engineer replaces one inspection appliance but forgets to register the new target into the GWLB target group.

Clients authenticate the correct hostname and negotiate supported TLS securely, with backend encryption handled as independently required. That result supports TLS listener certificates and ACM lifecycle but does not establish the requested networking outcome here. Instead verify: Regulated private traffic traverses authenticated encrypted tunnels with tested rekey and single-tunnel failover. Scenario: An enterprise assumes that its dedicated Direct Connect cross-connect encrypts database traffic and an audit requires proof of IPsec confidentiality.

Clients use approved HTTPS paths and cloud edge-to-origin transport follows required encryption policy without exposing origin publicly. That result supports CloudFront HTTPS policies and origin security but does not establish the requested networking outcome here. Instead verify: Regulated private traffic traverses authenticated encrypted tunnels with tested rekey and single-tunnel failover. Scenario: An enterprise assumes that its dedicated Direct Connect cross-connect encrypts database traffic and an audit requires proof of IPsec confidentiality.

Required traffic passes through supported inspection endpoints and prohibited destinations are blocked without disrupting established authorized flows. That result supports AWS Network Firewall stateful egress filtering but does not establish the requested networking outcome here. Instead verify: Regulated private traffic traverses authenticated encrypted tunnels with tested rekey and single-tunnel failover. Scenario: An enterprise assumes that its dedicated Direct Connect cross-connect encrypts database traffic and an audit requires proof of IPsec confidentiality.