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Review origin group priority, response status, origin health, failover criteria, request method and edge access logs. These checks are primarily associated with CloudFront origin groups and failover behavior; they are less discriminating for this case. The relevant checks are: Inspect listener certificates and policies, backend protocol, negotiated versions, target TLS configuration and end-to-end packet paths. Scenario: A compliance review discovers that the ALB terminates TLS but forwards plaintext HTTP to backends over a network segment required to be encrypted.

Review target health reason codes, protocol and port, health-check paths, target registration and AZ enablement. These checks are primarily associated with Load balancer target groups and health gating; they are less discriminating for this case. The relevant checks are: Inspect listener certificates and policies, backend protocol, negotiated versions, target TLS configuration and end-to-end packet paths. Scenario: A compliance review discovers that the ALB terminates TLS but forwards plaintext HTTP to backends over a network segment required to be encrypted.

Examine listener protocol, target group protocol, NLB zonal IP mappings, health check and traffic distribution behavior. These checks are primarily associated with Network Load Balancer TCP UDP and static addresses; they are less discriminating for this case. The relevant checks are: Inspect listener certificates and policies, backend protocol, negotiated versions, target TLS configuration and end-to-end packet paths. Scenario: A compliance review discovers that the ALB terminates TLS but forwards plaintext HTTP to backends over a network segment required to be encrypted.

Approved connectivity follows the intended TGW domain with stale routes removed and prohibited domains remaining isolated. That result supports Transit Gateway route changes and blackhole prevention but does not establish the requested networking outcome here. Instead verify: Operators identify where security policy rejects traffic or transport paths differ without claiming captured application payload content. Scenario: An analytics team has only default Flow Log fields and cannot distinguish original packet source from a transformed flow through a network interface.

Large application payloads traverse intended hybrid paths without fragmentation blackholes while small-packet reachability remains stable. That result supports Packet MTU MSS and Path MTU Discovery but does not establish the requested networking outcome here. Instead verify: Operators identify where security policy rejects traffic or transport paths differ without claiming captured application payload content. Scenario: An analytics team has only default Flow Log fields and cannot distinguish original packet source from a transformed flow through a network interface.

Planned growth completes without quota errors or silent route advertisement truncation. That result supports AWS network service quota and route-scale management but does not establish the requested networking outcome here. Instead verify: Operators identify where security policy rejects traffic or transport paths differ without claiming captured application payload content. Scenario: An analytics team has only default Flow Log fields and cannot distinguish original packet source from a transformed flow through a network interface.

Combine CloudTrail API activity with VPC Flow Logs metadata to investigate who changed network resources and how traffic behaved afterward. This choice relates to CloudTrail control-plane events versus Flow Logs traffic evidence, not the complementary response and evidence pair for the case. Prefer: Use AWS Firewall Manager with supported organization integration to apply and audit consistent WAF or network firewall policy across in-scope accounts and resources. Confirm with: Review organizational scope, policy type, resource inclusion, remediation state, compliance findings and delegated administrator status. Scenario: Security administrators enable automatic remediation but forget to document an approved service exception, triggering repeated policy conflicts.

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 AWS Firewall Manager with supported organization integration to apply and audit consistent WAF or network firewall policy across in-scope accounts and resources. Confirm with: Review organizational scope, policy type, resource inclusion, remediation state, compliance findings and delegated administrator status. Scenario: Security administrators enable automatic remediation but forget to document an approved service exception, triggering repeated policy conflicts.

Clients use approved HTTPS paths and cloud edge-to-origin transport follows required encryption policy without exposing origin publicly. This choice relates to CloudFront HTTPS policies and origin security, not the complementary response and evidence pair for the case. Prefer: Use AWS Firewall Manager with supported organization integration to apply and audit consistent WAF or network firewall policy across in-scope accounts and resources. Confirm with: Review organizational scope, policy type, resource inclusion, remediation state, compliance findings and delegated administrator status. Scenario: Security administrators enable automatic remediation but forget to document an approved service exception, triggering repeated policy conflicts.

Review mirror source target and filter, ENI support, target capture health, packet encapsulation and data classification. These checks are primarily associated with VPC Traffic Mirroring packet-level design; they are less discriminating for this case. The relevant checks are: Inspect logging attachment scope, aggregation interval, source and destination fields, action, log status and delivery destination. Scenario: A central operations team cannot diagnose a rejected database connection because Flow Logs were enabled on another subnet instead of the affected ENI.

Correlate CloudFront request IDs, ALB access log fields, DNS query logs, origin response times and encrypted log retention. These checks are primarily associated with ELB CloudFront and Route 53 log correlation; they are less discriminating for this case. The relevant checks are: Inspect logging attachment scope, aggregation interval, source and destination fields, action, log status and delivery destination. Scenario: A central operations team cannot diagnose a rejected database connection because Flow Logs were enabled on another subnet instead of the affected ENI.

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: Inspect logging attachment scope, aggregation interval, source and destination fields, action, log status and delivery destination. Scenario: A central operations team cannot diagnose a rejected database connection because Flow Logs were enabled on another subnet instead of the affected ENI.

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: Use supported VPC endpoint policies, identity policies and SG restrictions to govern access to AWS services without unrestricted internet traversal. Confirm with: Inspect endpoint type, policy principal/action/resource, identity policies, endpoint DNS, SG/NACL path and service access logs. Scenario: A central network team enables broad endpoint access and accidentally permits development workloads to call production service APIs through shared private DNS.

Inspect and enforce approved VPC egress or transit traffic with AWS Network Firewall stateful and stateless rule groups and appropriate route insertion. This choice relates to AWS Network Firewall stateful egress filtering, not the complementary response and evidence pair for the case. Prefer: Use supported VPC endpoint policies, identity policies and SG restrictions to govern access to AWS services without unrestricted internet traversal. Confirm with: Inspect endpoint type, policy principal/action/resource, identity policies, endpoint DNS, SG/NACL path and service access logs. Scenario: A central network team enables broad endpoint access and accidentally permits development workloads to call production service APIs through shared private DNS.

In-scope accounts conform to intended centrally governed network security policy while approved exclusions are documented. This choice relates to AWS Firewall Manager organization-wide audit, not the complementary response and evidence pair for the case. Prefer: Use supported VPC endpoint policies, identity policies and SG restrictions to govern access to AWS services without unrestricted internet traversal. Confirm with: Inspect endpoint type, policy principal/action/resource, identity policies, endpoint DNS, SG/NACL path and service access logs. Scenario: A central network team enables broad endpoint access and accidentally permits development workloads to call production service APIs through shared private DNS.

Use VPC Flow Logs and optional custom fields to correlate source, destination, traffic direction, flow action and relevant network interface. That approach addresses VPC Flow Logs custom fields and accepted or rejected flows instead of the principal requirement here. Flow Logs record IP flow metadata, not an exact packet trace; an ACCEPT entry does not prove application layer success. The better fit for this scenario is: Capture supported EC2 ENI traffic through VPC Traffic Mirroring into controlled analysis infrastructure when packet contents or flags are needed. Scenario: A team creates a mirror target but source ENI compatibility and security configuration prevent the packet stream reaching the capture appliance.

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: Capture supported EC2 ENI traffic through VPC Traffic Mirroring into controlled analysis infrastructure when packet contents or flags are needed. Scenario: A team creates a mirror target but source ENI compatibility and security configuration prevent the packet stream reaching the capture appliance.

Select CloudFront to cache eligible content and Global Accelerator to optimize supported TCP/UDP ingress and health-based regional endpoint paths. That approach addresses CloudFront caching versus Global Accelerator network optimization instead of the principal requirement here. Global Accelerator does not cache web objects, while CloudFront cannot be assumed to optimize arbitrary persistent UDP flows. The better fit for this scenario is: Capture supported EC2 ENI traffic through VPC Traffic Mirroring into controlled analysis infrastructure when packet contents or flags are needed. Scenario: A team creates a mirror target but source ENI compatibility and security configuration prevent the packet stream reaching the capture appliance.

Inspect multicast domain configuration, attachment associations, group source and member registration, supported instance characteristics and packet reachability. These checks are primarily associated with Transit Gateway multicast and routing limitations; they are less discriminating for this case. The relevant checks are: Compare alarm periods, VPN tunnel states, branch link records, TGW route metrics, change history and measured client reachability. Scenario: A managed WAN link begins dropping traffic and the dashboard only captures hourly average utilization, hiding burst congestion events.

Inspect current and adjustable quotas, route-table entry counts, subnet addresses, attachment inventory and failed API reason codes. These checks are primarily associated with AWS network service quota and route-scale management; they are less discriminating for this case. The relevant checks are: Compare alarm periods, VPN tunnel states, branch link records, TGW route metrics, change history and measured client reachability. Scenario: A managed WAN link begins dropping traffic and the dashboard only captures hourly average utilization, hiding burst congestion events.

Review analysis path, blockers, route tables, SGs, ACLs, endpoints, unsupported components and result timestamp. These checks are primarily associated with Reachability Analyzer static configuration diagnosis; they are less discriminating for this case. The relevant checks are: Compare alarm periods, VPN tunnel states, branch link records, TGW route metrics, change history and measured client reachability. Scenario: A managed WAN link begins dropping traffic and the dashboard only captures hourly average utilization, hiding burst congestion events.

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: Review organizational scope, policy type, resource inclusion, remediation state, compliance findings and delegated administrator status. Scenario: A compliance dashboard reports firewall rule findings and developers assume that the dashboard itself blocks all unauthorized traffic.

Inspect certificate SAN and issuer, listener binding, supported TLS policy, target-group protocol and browser validation results. These checks are primarily associated with TLS listener certificates and ACM lifecycle; they are less discriminating for this case. The relevant checks are: Review organizational scope, policy type, resource inclusion, remediation state, compliance findings and delegated administrator status. Scenario: A compliance dashboard reports firewall rule findings and developers assume that the dashboard itself blocks all unauthorized traffic.

Inspect log group permissions, filter pattern, metric namespace and dimensions, alarm window, delivery and event correlation. These checks are primarily associated with CloudWatch log metric filters and cross-source alert correlation; they are less discriminating for this case. The relevant checks are: Review organizational scope, policy type, resource inclusion, remediation state, compliance findings and delegated administrator status. Scenario: A compliance dashboard reports firewall rule findings and developers assume that the dashboard itself blocks all unauthorized traffic.

Check negotiation proposals, key exchange and rekey, child SA status, tunnel packet counters and effective routes. These checks are primarily associated with IPsec Site-to-Site VPN for network encryption; they are less discriminating for this case. The relevant checks are: Inspect log group permissions, filter pattern, metric namespace and dimensions, alarm window, delivery and event correlation. Scenario: A cross-account log pipeline lacks delivery permissions and an auditor assumes no events occurred because the central dashboard is empty.

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: Inspect log group permissions, filter pattern, metric namespace and dimensions, alarm window, delivery and event correlation. Scenario: A cross-account log pipeline lacks delivery permissions and an auditor assumes no events occurred because the central dashboard is empty.

Check mirror sources and filters, target health, capture timeline, packet identifiers, access logging and retention approvals. These checks are primarily associated with Traffic Mirroring forensic capture access governance; they are less discriminating for this case. The relevant checks are: Inspect log group permissions, filter pattern, metric namespace and dimensions, alarm window, delivery and event correlation. Scenario: A cross-account log pipeline lacks delivery permissions and an auditor assumes no events occurred because the central dashboard is empty.

Establish CloudWatch alarms and dashboards for measured packet loss, target errors, throughput and connectivity indicators with meaningful baselines. This choice relates to CloudWatch alarm baselines for network health, not the complementary response and evidence pair for the case. Prefer: Use VPC Flow Logs at the appropriate VPC, subnet or network-interface scope to summarize connection metadata and distinguish ACCEPT/REJECT results. Confirm with: Inspect logging attachment scope, aggregation interval, source and destination fields, action, log status and delivery destination. Scenario: An analyst sees ACCEPT in flow logs and assumes that an application transaction must have succeeded even though the destination process is not listening.

Workloads in associated VPCs resolve private records while public internet resolvers do not expose those records. This choice relates to Private hosted zones and VPC associations, not the complementary response and evidence pair for the case. Prefer: Use VPC Flow Logs at the appropriate VPC, subnet or network-interface scope to summarize connection metadata and distinguish ACCEPT/REJECT results. Confirm with: Inspect logging attachment scope, aggregation interval, source and destination fields, action, log status and delivery destination. Scenario: An analyst sees ACCEPT in flow logs and assumes that an application transaction must have succeeded even though the destination process is not listening.

Correlate CloudFront request IDs, ALB access log fields, DNS query logs, origin response times and encrypted log retention. This choice relates to ELB CloudFront and Route 53 log correlation, not the complementary response and evidence pair for the case. Prefer: Use VPC Flow Logs at the appropriate VPC, subnet or network-interface scope to summarize connection metadata and distinguish ACCEPT/REJECT results. Confirm with: Inspect logging attachment scope, aggregation interval, source and destination fields, action, log status and delivery destination. Scenario: An analyst sees ACCEPT in flow logs and assumes that an application transaction must have succeeded even though the destination process is not listening.

Eligible requests fail over to a healthy secondary origin without treating unsupported request methods as automatically retried. That result supports CloudFront origin groups and failover behavior but does not establish the requested networking outcome here. Instead verify: Clients keep stable anycast entry addresses while healthy regional application endpoints receive intended traffic. Scenario: A B2B SaaS partner allowlists two public IPs and cannot maintain changing regional load balancer DNS addresses during disaster recovery.

Alarms identify meaningful network degradation without treating missing metrics as either always healthy or always failed. That result supports CloudWatch alarm baselines for network health but does not establish the requested networking outcome here. Instead verify: Clients keep stable anycast entry addresses while healthy regional application endpoints receive intended traffic. Scenario: A B2B SaaS partner allowlists two public IPs and cannot maintain changing regional load balancer DNS addresses during disaster recovery.

Workloads in associated VPCs resolve private records while public internet resolvers do not expose those records. That result supports Private hosted zones and VPC associations but does not establish the requested networking outcome here. Instead verify: Clients keep stable anycast entry addresses while healthy regional application endpoints receive intended traffic. Scenario: A B2B SaaS partner allowlists two public IPs and cannot maintain changing regional load balancer DNS addresses during disaster recovery.