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Inspect log scope, ENI IDs, source and destination addresses, ports, action, tcp-flags, log-status and delivery latency. These checks are primarily associated with VPC Flow Logs custom fields and accepted or rejected flows; they are less discriminating for this case. The relevant checks are: Review analysis path, blockers, route tables, SGs, ACLs, endpoints, unsupported components and result timestamp. Scenario: An operator receives a reachable result to a database ENI and declares the database application available despite a stopped listener process.

Inspect DF-bit probes, ICMP fragmentation feedback, tunnel encapsulation, ENI MTU, jumbo frame support and packet traces. These checks are primarily associated with Packet MTU MSS and Path MTU Discovery; they are less discriminating for this case. The relevant checks are: Review analysis path, blockers, route tables, SGs, ACLs, endpoints, unsupported components and result timestamp. Scenario: An operator receives a reachable result to a database ENI and declares the database application available despite a stopped listener process.

Inspect subnet available address counts, network interface consumption, load balancer scale events, CNI IP allocation and VPC CIDR associations. These checks are primarily associated with VPC subnet IP address exhaustion and growth; they are less discriminating for this case. The relevant checks are: Review analysis path, blockers, route tables, SGs, ACLs, endpoints, unsupported components and result timestamp. Scenario: An operator receives a reachable result to a database ENI and declares the database application available despite a stopped listener process.

Review TGW attachment associations, propagation entries, static routes, attachment state and intended route-table isolation. These checks are primarily associated with Transit Gateway hub-and-spoke routing architecture; they are less discriminating for this case. The relevant checks are: Correlate CloudFront request IDs, ALB access log fields, DNS query logs, origin response times and encrypted log retention. Scenario: CloudFront returns successful cached objects during an origin outage, and analysts mistakenly infer from missing ALB requests that no users accessed the site.

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: Correlate CloudFront request IDs, ALB access log fields, DNS query logs, origin response times and encrypted log retention. Scenario: CloudFront returns successful cached objects during an origin outage, and analysts mistakenly infer from missing ALB requests that no users accessed the site.

Review registered core and transit gateways, sites and links, topology state, telemetry sources and recent route changes. These checks are primarily associated with Transit Gateway Network Manager topology visibility; they are less discriminating for this case. The relevant checks are: Correlate CloudFront request IDs, ALB access log fields, DNS query logs, origin response times and encrypted log retention. Scenario: CloudFront returns successful cached objects during an origin outage, and analysts mistakenly infer from missing ALB requests that no users accessed the site.

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: 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 firewall endpoint availability, routing symmetry, stateful rule order, flow/alert logs, drop reasons and policy associations. These checks are primarily associated with AWS Network Firewall stateful egress filtering; 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: Security administrators enable automatic remediation but forget to document an approved service exception, triggering repeated policy conflicts.

Inspect issuing CA hierarchy, certificate templates and subject names, trust store, revocation strategy and endpoint handshake logs. These checks are primarily associated with AWS Private CA service-to-service TLS and rotation; 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: 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: Enforce HTTPS viewer policies and origin protocol policies on a CloudFront distribution, using trusted origin certificates and least-privilege origin access. Scenario: A CDN redirects visitors to HTTPS but retrieves sensitive responses over HTTP from a custom origin in a compliance-sensitive network.

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: Enforce HTTPS viewer policies and origin protocol policies on a CloudFront distribution, using trusted origin certificates and least-privilege origin access. Scenario: A CDN redirects visitors to HTTPS but retrieves sensitive responses over HTTP from a custom origin in a compliance-sensitive network.

Use ACM Private Certificate Authority where appropriate for private PKI and managed service-to-service TLS identities with restricted issuance and rotation. That approach addresses AWS Private CA service-to-service TLS and rotation instead of the principal requirement here. Private certificates require clients to trust the issuing CA; owning a certificate file does not establish secure identity without hostname and chain validation. The better fit for this scenario is: Enforce HTTPS viewer policies and origin protocol policies on a CloudFront distribution, using trusted origin certificates and least-privilege origin access. Scenario: A CDN redirects visitors to HTTPS but retrieves sensitive responses over HTTP from a custom origin in a compliance-sensitive network.

Review cache hit ratio, edge response times, GA endpoint health, static IP entry points and workload protocol. These checks are primarily associated with CloudFront caching versus Global Accelerator network optimization; they are less discriminating for this case. The relevant checks are: 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.

Inspect BGP session history, neighbor state, advertised and learned prefixes, VIF status and change timeline. These checks are primarily associated with Direct Connect BGP neighbor monitoring and route changes; they are less discriminating for this case. The relevant checks are: 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.

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: 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.

Maintain BGP sessions on Direct Connect private or transit VIFs with documented prefix filters, routing preferences and alert thresholds. That approach addresses Direct Connect BGP neighbor monitoring and route changes instead of the principal requirement here. A BGP session being established is necessary for dynamic routing but does not prove expected prefixes are present or that route-table targets are valid. The better fit for this scenario is: Combine CloudWatch tunnel and link metrics with Network Manager topology and route-change context for multi-site incident triage. Scenario: A managed WAN link begins dropping traffic and the dashboard only captures hourly average utilization, hiding burst congestion events.

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: Combine CloudWatch tunnel and link metrics with Network Manager topology and route-change context for multi-site incident triage. Scenario: A managed WAN link begins dropping traffic and the dashboard only captures hourly average utilization, hiding burst congestion events.

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: Combine CloudWatch tunnel and link metrics with Network Manager topology and route-change context for multi-site incident triage. Scenario: A managed WAN link begins dropping traffic and the dashboard only captures hourly average utilization, hiding burst congestion events.

Inspect log scope, ENI IDs, source and destination addresses, ports, action, tcp-flags, log-status and delivery latency. These checks are primarily associated with VPC Flow Logs custom fields and accepted or rejected flows; they are less discriminating for this case. The relevant checks are: Inspect DF-bit probes, ICMP fragmentation feedback, tunnel encapsulation, ENI MTU, jumbo frame support and packet traces. Scenario: A file transfer over VPN freezes after TLS handshake while small HTTPS health checks succeed because PMTUD messages are filtered.

Review instance type support, enhanced networking drivers, ENA metrics, EFA topology and expected packet throughput. These checks are primarily associated with ENA EFA and network-adapter performance selection; they are less discriminating for this case. The relevant checks are: Inspect DF-bit probes, ICMP fragmentation feedback, tunnel encapsulation, ENI MTU, jumbo frame support and packet traces. Scenario: A file transfer over VPN freezes after TLS handshake while small HTTPS health checks succeed because PMTUD messages are filtered.

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: Inspect DF-bit probes, ICMP fragmentation feedback, tunnel encapsulation, ENI MTU, jumbo frame support and packet traces. Scenario: A file transfer over VPN freezes after TLS handshake while small HTTPS health checks succeed because PMTUD messages are filtered.

Operators identify where security policy rejects traffic or transport paths differ without claiming captured application payload content. That result supports VPC Flow Logs custom fields and accepted or rejected flows but does not establish the requested networking outcome here. Instead verify: The network configuration contains an allowed logical path where intended, and live tests confirm service responsiveness independently. Scenario: A security group policy update breaks access from a bastion host, and an engineer needs a configuration-based explanation for the denied path.

Authorized packet traces reveal transport failures and remain access-controlled with appropriate retention. That result supports Traffic Mirroring packet captures for retransmission analysis but does not establish the requested networking outcome here. Instead verify: The network configuration contains an allowed logical path where intended, and live tests confirm service responsiveness independently. Scenario: A security group policy update breaks access from a bastion host, and an engineer needs a configuration-based explanation for the denied path.

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: The network configuration contains an allowed logical path where intended, and live tests confirm service responsiveness independently. Scenario: A security group policy update breaks access from a bastion host, and an engineer needs a configuration-based explanation for the denied path.

Review cache hit ratio, edge response times, GA endpoint health, static IP entry points and workload protocol. These checks are primarily associated with CloudFront caching versus Global Accelerator network optimization; they are less discriminating for this case. The relevant checks are: Inspect current and adjustable quotas, route-table entry counts, subnet addresses, attachment inventory and failed API reason codes. Scenario: Engineers add dozens of subnets and find a route table has reached an entry limit even though the VPC CIDR allocation is large.

Review tunnel metrics and IKE/IPsec logs, BGP route changes, customer gateway policies, packet loss and failover timestamps. These checks are primarily associated with Site-to-Site VPN tunnel recovery and path policy; they are less discriminating for this case. The relevant checks are: Inspect current and adjustable quotas, route-table entry counts, subnet addresses, attachment inventory and failed API reason codes. Scenario: Engineers add dozens of subnets and find a route table has reached an entry limit even though the VPC CIDR allocation is large.

Inspect BGP session history, neighbor state, advertised and learned prefixes, VIF status and change timeline. These checks are primarily associated with Direct Connect BGP neighbor monitoring and route changes; they are less discriminating for this case. The relevant checks are: Inspect current and adjustable quotas, route-table entry counts, subnet addresses, attachment inventory and failed API reason codes. Scenario: Engineers add dozens of subnets and find a route table has reached an entry limit even though the VPC CIDR allocation is large.

The network configuration contains an allowed logical path where intended, and live tests confirm service responsiveness independently. That result supports Reachability Analyzer static configuration diagnosis but does not establish the requested networking outcome here. Instead verify: Authorized packet traces reveal transport failures and remain access-controlled with appropriate retention. Scenario: A team creates a mirror target but source ENI compatibility and security configuration prevent the packet stream reaching the capture appliance.

Operations correlate network degradation with the right attachment or branch rather than acting on an isolated healthy metric. That result supports CloudWatch and Network Manager hybrid incident telemetry but does not establish the requested networking outcome here. Instead verify: Authorized packet traces reveal transport failures and remain access-controlled with appropriate retention. Scenario: A team creates a mirror target but source ENI compatibility and security configuration prevent the packet stream reaching the capture appliance.

Only intended multicast group members receive application traffic under supported topology and security constraints. That result supports Transit Gateway multicast and routing limitations but does not establish the requested networking outcome here. Instead verify: Authorized packet traces reveal transport failures and remain access-controlled with appropriate retention. Scenario: A team creates a mirror target but source ENI compatibility and security configuration prevent the packet stream reaching the capture appliance.

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: Apply least-privilege security groups to ENIs and deliberate subnet network ACL rules while accounting for stateful return behavior and stateless ephemeral ports. Scenario: A subnet network ACL allows incoming TCP 443 but refuses ephemeral reply ports, causing intermittent connection failures even though instance SG rules are correct.

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: Apply least-privilege security groups to ENIs and deliberate subnet network ACL rules while accounting for stateful return behavior and stateless ephemeral ports. Scenario: A subnet network ACL allows incoming TCP 443 but refuses ephemeral reply ports, causing intermittent connection failures even though instance SG rules are correct.

Use ACM Private Certificate Authority where appropriate for private PKI and managed service-to-service TLS identities with restricted issuance and rotation. That approach addresses AWS Private CA service-to-service TLS and rotation instead of the principal requirement here. Private certificates require clients to trust the issuing CA; owning a certificate file does not establish secure identity without hostname and chain validation. The better fit for this scenario is: Apply least-privilege security groups to ENIs and deliberate subnet network ACL rules while accounting for stateful return behavior and stateless ephemeral ports. Scenario: A subnet network ACL allows incoming TCP 443 but refuses ephemeral reply ports, causing intermittent connection failures even though instance SG rules are correct.