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Capture supported EC2 ENI traffic through VPC Traffic Mirroring into controlled analysis infrastructure when packet contents or flags are needed. That approach addresses Traffic Mirroring packet captures for retransmission analysis instead of the principal requirement here. Flow Logs summarize flows, whereas Traffic Mirroring enables packet-level inspection; not every AWS resource supports mirroring. The better fit for this scenario is: Evaluate cross-AZ, cross-Region, NAT gateway, VPN and Direct Connect data transfer charges against measured traffic and routing needs. Scenario: A high-volume on-premises replication workflow selects internet VPN solely for perceived low fixed cost and ignores egress throughput and transfer charges.

Reserve sufficient usable addresses across target Availability Zones, monitor subnet IP utilization and add appropriate secondary CIDRs or subnets for scaling. That approach addresses VPC subnet IP address exhaustion and growth instead of the principal requirement here. AWS subnets reserve addresses and ENIs consume IP allocations; a large VPC block cannot prevent one undersized subnet from exhausting its own space. The better fit for this scenario is: Evaluate cross-AZ, cross-Region, NAT gateway, VPN and Direct Connect data transfer charges against measured traffic and routing needs. Scenario: A high-volume on-premises replication workflow selects internet VPN solely for perceived low fixed cost and ignores egress throughput and transfer charges.

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: Evaluate cross-AZ, cross-Region, NAT gateway, VPN and Direct Connect data transfer charges against measured traffic and routing needs. Scenario: A high-volume on-premises replication workflow selects internet VPN solely for perceived low fixed cost and ignores egress throughput and transfer charges.

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: Engineers move an interface endpoint into a subnet with a restrictive ACL and the service becomes intermittently unavailable.

Evaluate cross-AZ, cross-Region, NAT gateway, VPN and Direct Connect data transfer charges against measured traffic and routing needs. That approach addresses Data transfer cost and hybrid path selection instead of the principal requirement here. Lower network hop count does not always mean lower bill; cross-AZ data and NAT processing charges may dominate certain workload patterns. 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: Engineers move an interface endpoint into a subnet with a restrictive ACL and the service becomes intermittently unavailable.

Maintain two Site-to-Site VPN tunnels and customer-gateway routing logic, testing failover and asymmetric path behavior under authorized maintenance. That approach addresses Site-to-Site VPN tunnel recovery and path policy instead of the principal requirement here. Two VPN tunnels provide alternative transport, not guaranteed resilience when policy, prefix advertisements or customer edge configuration are inconsistent. 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: Engineers move an interface endpoint into a subnet with a restrictive ACL and the service becomes intermittently unavailable.

Inspect private zone ID, creating account, association authorization, resource share, VPC ownership, DNS query path and restrictions. This choice relates to Cross-account private DNS hosted zone associations, not the complementary response and evidence pair for the case. Prefer: Create Route 53 Resolver outbound endpoint forwarding rules for intended internal domain suffixes and associate rules with every consuming VPC. Confirm with: Inspect outbound endpoint status, corporate DNS targets, rule priority and domain suffix, VPC rule associations, UDP/TCP 53 security groups and query logs. Scenario: A DNS team adds a conditional resolver forwarding rule but points it to a public DNS service that cannot authoritatively answer the internal suffix.

Build Route 53 Resolver inbound endpoints reachable over the approved network path so corporate DNS can query private AWS hosted zone names. This choice relates to Resolver inbound endpoint for AWS private zone access, not the complementary response and evidence pair for the case. Prefer: Create Route 53 Resolver outbound endpoint forwarding rules for intended internal domain suffixes and associate rules with every consuming VPC. Confirm with: Inspect outbound endpoint status, corporate DNS targets, rule priority and domain suffix, VPC rule associations, UDP/TCP 53 security groups and query logs. Scenario: A DNS team adds a conditional resolver forwarding rule but points it to a public DNS service that cannot authoritatively answer the internal suffix.

Intended private traffic crosses directly peered VPCs without accidental internet ingress or assumed transitivity. This choice relates to VPC peering routes and security controls, not the complementary response and evidence pair for the case. Prefer: Create Route 53 Resolver outbound endpoint forwarding rules for intended internal domain suffixes and associate rules with every consuming VPC. Confirm with: Inspect outbound endpoint status, corporate DNS targets, rule priority and domain suffix, VPC rule associations, UDP/TCP 53 security groups and query logs. Scenario: A DNS team adds a conditional resolver forwarding rule but points it to a public DNS service that cannot authoritatively answer the internal suffix.

Review TGW attachment associations, propagation entries, static routes, attachment state and intended route-table isolation. This choice relates to Transit Gateway hub-and-spoke routing architecture, not the complementary response and evidence pair for the case. Prefer: Separate viewer cache-key dimensions from values forwarded to origins, and include only request values that change the actual representation. Confirm with: Compare cache policy headers, cookies and query parameters, origin request policy, cache status and response variants. Scenario: A product site forwards campaign tracking parameters to its origin and mistakenly includes every random tracking token in the cache key, driving cache hit ratio toward zero.

Put AWS WAF at supported CloudFront or Application Load Balancer entry points and select AWS Shield features appropriate to volumetric and application threats. This choice relates to AWS WAF and Shield edge placement, not the complementary response and evidence pair for the case. Prefer: Separate viewer cache-key dimensions from values forwarded to origins, and include only request values that change the actual representation. Confirm with: Compare cache policy headers, cookies and query parameters, origin request policy, cache status and response variants. Scenario: A product site forwards campaign tracking parameters to its origin and mistakenly includes every random tracking token in the cache key, driving cache hit ratio toward zero.

Investigators follow an authorized request across edge and origin layers while limiting retention of identifiers and sensitive headers. This choice relates to ELB CloudFront and Route 53 log correlation, not the complementary response and evidence pair for the case. Prefer: Separate viewer cache-key dimensions from values forwarded to origins, and include only request values that change the actual representation. Confirm with: Compare cache policy headers, cookies and query parameters, origin request policy, cache status and response variants. Scenario: A product site forwards campaign tracking parameters to its origin and mistakenly includes every random tracking token in the cache key, driving cache hit ratio toward zero.

Combine CloudTrail API activity with VPC Flow Logs metadata to investigate who changed network resources and how traffic behaved afterward. That approach addresses CloudTrail control-plane events versus Flow Logs traffic evidence instead of the principal requirement here. CloudTrail records API activity and Flow Logs summarize network flow metadata; neither alone proves application payload success. The better fit for this scenario is: Use AWS Firewall Manager with supported organization integration to apply and audit consistent WAF or network firewall policy across in-scope accounts and resources. Scenario: Security administrators enable automatic remediation but forget to document an approved service exception, triggering repeated policy conflicts.

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: Use AWS Firewall Manager with supported organization integration to apply and audit consistent WAF or network firewall policy across in-scope accounts and resources. Scenario: Security administrators enable automatic remediation but forget to document an approved service exception, triggering repeated policy conflicts.

Implement Gateway Load Balancer endpoint traffic steering into compatible third-party inspection appliances with high availability and flow symmetry. That approach addresses Gateway Load Balancer centralized inspection and symmetry instead of the principal requirement here. An appliance having a healthy target status does not ensure return-path symmetry; routes and AZ-local endpoint placement are part of the inspection design. The better fit for this scenario is: Use AWS Firewall Manager with supported organization integration to apply and audit consistent WAF or network firewall policy across in-scope accounts and resources. Scenario: Security administrators enable automatic remediation but forget to document an approved service exception, triggering repeated policy conflicts.

Required traffic passes through supported inspection endpoints and prohibited destinations are blocked without disrupting established authorized flows. This choice relates to AWS Network Firewall stateful egress filtering, not the complementary response and evidence pair for the case. Prefer: Use supported CloudWatch Logs metric filters, alarms and event processing to alert on network policy violations with sufficient context and tuning. Confirm with: Inspect log group permissions, filter pattern, metric namespace and dimensions, alarm window, delivery and event correlation. Scenario: A CloudWatch metric filter watches a log group that never receives AWS Network Firewall alert logs, so expected blocked-traffic alarms never fire.

Use AWS Firewall Manager with supported organization integration to apply and audit consistent WAF or network firewall policy across in-scope accounts and resources. This choice relates to AWS Firewall Manager organization-wide audit, not the complementary response and evidence pair for the case. Prefer: Use supported CloudWatch Logs metric filters, alarms and event processing to alert on network policy violations with sufficient context and tuning. Confirm with: Inspect log group permissions, filter pattern, metric namespace and dimensions, alarm window, delivery and event correlation. Scenario: A CloudWatch metric filter watches a log group that never receives AWS Network Firewall alert logs, so expected blocked-traffic alarms never fire.

Inspect endpoint type, policy principal/action/resource, identity policies, endpoint DNS, SG/NACL path and service access logs. This choice relates to Endpoint policies and least-privilege private egress, not the complementary response and evidence pair for the case. Prefer: Use supported CloudWatch Logs metric filters, alarms and event processing to alert on network policy violations with sufficient context and tuning. Confirm with: Inspect log group permissions, filter pattern, metric namespace and dimensions, alarm window, delivery and event correlation. Scenario: A CloudWatch metric filter watches a log group that never receives AWS Network Firewall alert logs, so expected blocked-traffic alarms never fire.

Intended private traffic crosses directly peered VPCs without accidental internet ingress or assumed transitivity. This choice relates to VPC peering routes and security controls, not the complementary response and evidence pair for the case. Prefer: Connect appropriate private or transit VIFs through a Direct Connect gateway and supported gateway associations, enforcing allowed prefixes and account boundaries. Confirm with: Inspect DX gateway associations, attached transit or virtual private gateway, allowed prefixes, VIF type, BGP advertisements and quota constraints. Scenario: A networking engineer changes allowed prefixes at a DX gateway association but does not confirm corresponding advertisements on the external BGP router.

Run supported AWS Site-to-Site VPN tunnels over a suitable Direct Connect public connectivity path when traffic must be encrypted in transit across a private physical connection. This choice relates to VPN over Direct Connect for encrypted hybrid connectivity, not the complementary response and evidence pair for the case. Prefer: Connect appropriate private or transit VIFs through a Direct Connect gateway and supported gateway associations, enforcing allowed prefixes and account boundaries. Confirm with: Inspect DX gateway associations, attached transit or virtual private gateway, allowed prefixes, VIF type, BGP advertisements and quota constraints. Scenario: A networking engineer changes allowed prefixes at a DX gateway association but does not confirm corresponding advertisements on the external BGP router.

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: Connect appropriate private or transit VIFs through a Direct Connect gateway and supported gateway associations, enforcing allowed prefixes and account boundaries. Confirm with: Inspect DX gateway associations, attached transit or virtual private gateway, allowed prefixes, VIF type, BGP advertisements and quota constraints. Scenario: A networking engineer changes allowed prefixes at a DX gateway association but does not confirm corresponding advertisements on the external BGP router.

Inspect listener ports, endpoint weights, health status, client path, AWS edge entry and endpoint-group traffic dials. These checks are primarily associated with AWS Global Accelerator anycast ingress; they are less discriminating for this case. The relevant checks are: Review origin group priority, response status, origin health, failover criteria, request method and edge access logs. Scenario: An engineer proposes using CloudFront origin failover as a guaranteed retry mechanism for payment POST submissions during an origin outage.

Inspect signature key group and validity, cache behavior, S3 origin access control, bucket permissions and denied direct-origin requests. These checks are primarily associated with CloudFront private content access; they are less discriminating for this case. The relevant checks are: Review origin group priority, response status, origin health, failover criteria, request method and edge access logs. Scenario: An engineer proposes using CloudFront origin failover as a guaranteed retry mechanism for payment POST submissions during an origin outage.

Inspect metric dimensions, statistic, evaluation windows, missing-data treatment, alarm actions and correlated service health. These checks are primarily associated with CloudWatch alarm baselines for network health; they are less discriminating for this case. The relevant checks are: Review origin group priority, response status, origin health, failover criteria, request method and edge access logs. Scenario: An engineer proposes using CloudFront origin failover as a guaranteed retry mechanism for payment POST submissions during an origin outage.

Application abuse is reduced at the chosen supported entry point while normal requests continue under measured policy. This choice relates to AWS WAF Shield and application threat boundaries, not the complementary response and evidence pair for the case. Prefer: Configure supported ALB or NLB TLS/HTTPS listeners with appropriate ACM certificates and policies and plan certificate replacement before expiry. Confirm with: Inspect certificate SAN and issuer, listener binding, supported TLS policy, target-group protocol and browser validation results. Scenario: An operations team replaces an ACM certificate but does not update the load-balancer listener attachment and traffic still presents the old certificate.

Inspect GWLBe subnet routes, GWLB target health, GENEVE tunnel behavior, appliance state and AZ-specific return paths. This choice relates to Gateway Load Balancer centralized inspection and symmetry, not the complementary response and evidence pair for the case. Prefer: Configure supported ALB or NLB TLS/HTTPS listeners with appropriate ACM certificates and policies and plan certificate replacement before expiry. Confirm with: Inspect certificate SAN and issuer, listener binding, supported TLS policy, target-group protocol and browser validation results. Scenario: An operations team replaces an ACM certificate but does not update the load-balancer listener attachment and traffic still presents the old certificate.

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: Configure supported ALB or NLB TLS/HTTPS listeners with appropriate ACM certificates and policies and plan certificate replacement before expiry. Confirm with: Inspect certificate SAN and issuer, listener binding, supported TLS policy, target-group protocol and browser validation results. Scenario: An operations team replaces an ACM certificate but does not update the load-balancer listener attachment and traffic still presents the old certificate.

Examine Connect peer IPs, GRE tunnels, BGP neighbors, Transit Gateway associations and propagated routes. These checks are primarily associated with Transit Gateway Connect integration for SD-WAN; they are less discriminating for this case. The relevant checks are: Review circuit locations, DX virtual interfaces, advertised BGP prefixes, VPN tunnel health, failover tests and route priorities. Scenario: An organization advertises the VPN backup routes at the same preference as its Direct Connect link and discovers return traffic becomes asymmetric during normal operation.

Inspect organization sharing permissions, subnet share acceptance, VPC owner routing and participant-owned resource deployment. These checks are primarily associated with Shared VPC subnet administration via AWS RAM; they are less discriminating for this case. The relevant checks are: Review circuit locations, DX virtual interfaces, advertised BGP prefixes, VPN tunnel health, failover tests and route priorities. Scenario: An organization advertises the VPN backup routes at the same preference as its Direct Connect link and discovers return traffic becomes asymmetric during normal operation.

Inspect BGP neighbor state, received and advertised routes, prefix filters, path attributes and chosen best paths on both sides. These checks are primarily associated with BGP route advertisements and traffic engineering; they are less discriminating for this case. The relevant checks are: Review circuit locations, DX virtual interfaces, advertised BGP prefixes, VPN tunnel health, failover tests and route priorities. Scenario: An organization advertises the VPN backup routes at the same preference as its Direct Connect link and discovers return traffic becomes asymmetric during normal operation.

Inspect template parameter values, change sets, route dependencies, stack outputs, drift state and failure/rollback events. This choice relates to CloudFormation parameterized network templates, not the complementary response and evidence pair for the case. Prefer: Combine supported EventBridge events and an authorized Lambda handler to react to network configuration changes with narrow automated remediation. Confirm with: Inspect event pattern and detail, Lambda IAM role, idempotency key, retry/DLQ policy, logged action and configuration outcome. Scenario: A central security team wants new public security-group rules flagged and corrected but its Lambda has no permissions to modify the relevant resources.

Gate network IaC deployment on route reachability tests, reviewed changes, canary application checks and documented rollback with independent health metrics. This choice relates to Safe network change rollout and rollback automation, not the complementary response and evidence pair for the case. Prefer: Combine supported EventBridge events and an authorized Lambda handler to react to network configuration changes with narrow automated remediation. Confirm with: Inspect event pattern and detail, Lambda IAM role, idempotency key, retry/DLQ policy, logged action and configuration outcome. Scenario: A central security team wants new public security-group rules flagged and corrected but its Lambda has no permissions to modify the relevant resources.

The VIF establishes layer-two and layer-three adjacency and exchanges only authorized networks with no VLAN collision. This choice relates to Direct Connect LOA VLAN and BGP bring-up, not the complementary response and evidence pair for the case. Prefer: Combine supported EventBridge events and an authorized Lambda handler to react to network configuration changes with narrow automated remediation. Confirm with: Inspect event pattern and detail, Lambda IAM role, idempotency key, retry/DLQ policy, logged action and configuration outcome. Scenario: A central security team wants new public security-group rules flagged and corrected but its Lambda has no permissions to modify the relevant resources.