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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: Mirror supported ENI packet traffic to a controlled collector for approved incident analysis with scope filters, encryption and retention controls. Confirm with: Check mirror sources and filters, target health, capture timeline, packet identifiers, access logging and retention approvals. Scenario: An incident responder needs TLS handshake packet ordering and only the default VPC Flow Logs are retained, so packet-level evidence is missing.

Build appropriately scoped custom VPC Flow Log records including relevant packet and interface fields to correlate network policy enforcement. This choice relates to Custom VPC Flow Log fields and aggregation limits, not the complementary response and evidence pair for the case. Prefer: Mirror supported ENI packet traffic to a controlled collector for approved incident analysis with scope filters, encryption and retention controls. Confirm with: Check mirror sources and filters, target health, capture timeline, packet identifiers, access logging and retention approvals. Scenario: An incident responder needs TLS handshake packet ordering and only the default VPC Flow Logs are retained, so packet-level evidence is missing.

Inspect log group permissions, filter pattern, metric namespace and dimensions, alarm window, delivery and event correlation. This choice relates to CloudWatch log metric filters and cross-source alert correlation, not the complementary response and evidence pair for the case. Prefer: Mirror supported ENI packet traffic to a controlled collector for approved incident analysis with scope filters, encryption and retention controls. Confirm with: Check mirror sources and filters, target health, capture timeline, packet identifiers, access logging and retention approvals. Scenario: An incident responder needs TLS handshake packet ordering and only the default VPC Flow Logs are retained, so packet-level evidence is missing.

Review DX VIF reachability to VPN endpoint public IPs, IKE proposals, tunnel BGP routes, MTU/MSS and encryption evidence. This choice relates to VPN over Direct Connect for encrypted hybrid connectivity, 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: An existing 1-Gbps Direct Connect circuit is upgraded and the new router uses mismatched BGP ASN and peer settings, preventing prefixes from appearing.

Data-center clients can resolve the intended AWS private names while unrelated public resolvers still do not publish those records. This choice relates to Resolver inbound endpoint for AWS private zone access, 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: An existing 1-Gbps Direct Connect circuit is upgraded and the new router uses mismatched BGP ASN and peer settings, preventing prefixes from appearing.

Connect appropriate private or transit VIFs through a Direct Connect gateway and supported gateway associations, enforcing allowed prefixes and account boundaries. This choice relates to Direct Connect gateway and association limits, 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: An existing 1-Gbps Direct Connect circuit is upgraded and the new router uses mismatched BGP ASN and peer settings, preventing prefixes from appearing.

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: Check negotiation proposals, key exchange and rekey, child SA status, tunnel packet counters and effective routes. Scenario: A successful VPN tunnel state appears in the console but packets use an alternate plaintext route because route selection prefers a non-VPN path.

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: Check negotiation proposals, key exchange and rekey, child SA status, tunnel packet counters and effective routes. Scenario: A successful VPN tunnel state appears in the console but packets use an alternate plaintext route because route selection prefers a non-VPN path.

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: Check negotiation proposals, key exchange and rekey, child SA status, tunnel packet counters and effective routes. Scenario: A successful VPN tunnel state appears in the console but packets use an alternate plaintext route because route selection prefers a non-VPN path.

Examine routing policy, alias evaluation, health checks, regional endpoints, resolver cache behavior and observed DNS answers. These checks are primarily associated with Weighted latency and failover Route 53 records; they are less discriminating for this case. The relevant checks are: Inspect private zone ID, creating account, association authorization, resource share, VPC ownership, DNS query path and restrictions. Scenario: A child account attempts to associate a VPC with a private hosted zone from another account but has not obtained required authorization.

Check public hosted zone signing state, key-signing key health, parent DS records, validating resolver results and name server delegation. These checks are primarily associated with Route 53 DNSSEC public signing and delegation; they are less discriminating for this case. The relevant checks are: Inspect private zone ID, creating account, association authorization, resource share, VPC ownership, DNS query path and restrictions. Scenario: A child account attempts to associate a VPC with a private hosted zone from another account but has not obtained required authorization.

Inspect resource configuration timeline, CloudFormation stack state, Config evaluation, rule evidence and change approval records. These checks are primarily associated with Network configuration drift and guardrail audits; they are less discriminating for this case. The relevant checks are: Inspect private zone ID, creating account, association authorization, resource share, VPC ownership, DNS query path and restrictions. Scenario: A child account attempts to associate a VPC with a private hosted zone from another account but has not obtained required authorization.

Directly peered VPCs exchange only intended traffic while third-party peering does not become an unplanned transit hub. This choice relates to VPC peering nontransitive routing, not the complementary response and evidence pair for the case. Prefer: Put AWS WAF at supported CloudFront or Application Load Balancer entry points and select AWS Shield features appropriate to volumetric and application threats. Confirm with: Review web ACL association, WAF rule actions, sampled requests, DDoS metrics, blocked counts and false positives. Scenario: A team enables a broad managed WAF rule set before measuring application traffic and inadvertently blocks legitimate multilingual search queries.

Separate viewer cache-key dimensions from values forwarded to origins, and include only request values that change the actual representation. This choice relates to CloudFront cache key and origin request policies, not the complementary response and evidence pair for the case. Prefer: Put AWS WAF at supported CloudFront or Application Load Balancer entry points and select AWS Shield features appropriate to volumetric and application threats. Confirm with: Review web ACL association, WAF rule actions, sampled requests, DDoS metrics, blocked counts and false positives. Scenario: A team enables a broad managed WAF rule set before measuring application traffic and inadvertently blocks legitimate multilingual search queries.

Review origin group priority, response status, origin health, failover criteria, request method and edge access logs. This choice relates to CloudFront origin groups and failover behavior, not the complementary response and evidence pair for the case. Prefer: Put AWS WAF at supported CloudFront or Application Load Balancer entry points and select AWS Shield features appropriate to volumetric and application threats. Confirm with: Review web ACL association, WAF rule actions, sampled requests, DDoS metrics, blocked counts and false positives. Scenario: A team enables a broad managed WAF rule set before measuring application traffic and inadvertently blocks legitimate multilingual search queries.

Inspect listener certificates and policies, backend protocol, negotiated versions, target TLS configuration and end-to-end packet paths. These checks are primarily associated with TLS termination and backend encryption with load balancers; they are less discriminating for this case. The relevant checks are: Inspect listeners, priority ordered rules, target groups, forwarded headers, ALB access logs and web ACL association. Scenario: A public platform routes api.example.com and shop.example.com to different backend pools but was provisioned with a layer-four listener lacking host-based rules.

Inspect VIF type, VLAN and BGP peer addresses, advertised AWS prefixes, DX gateway attachment and target endpoint type. These checks are primarily associated with Direct Connect private and public VIF selection; they are less discriminating for this case. The relevant checks are: Inspect listeners, priority ordered rules, target groups, forwarded headers, ALB access logs and web ACL association. Scenario: A public platform routes api.example.com and shop.example.com to different backend pools but was provisioned with a layer-four listener lacking host-based rules.

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 listeners, priority ordered rules, target groups, forwarded headers, ALB access logs and web ACL association. Scenario: A public platform routes api.example.com and shop.example.com to different backend pools but was provisioned with a layer-four listener lacking host-based rules.

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: Required application traffic survives a single-tunnel interruption and returns to intended primary routes after stable recovery. Scenario: An operator upgrades the firmware on the primary customer gateway and the VPN backup remains up but does not advertise required corporate prefixes.

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: Required application traffic survives a single-tunnel interruption and returns to intended primary routes after stable recovery. Scenario: An operator upgrades the firmware on the primary customer gateway and the VPN backup remains up but does not advertise required corporate prefixes.

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: Required application traffic survives a single-tunnel interruption and returns to intended primary routes after stable recovery. Scenario: An operator upgrades the firmware on the primary customer gateway and the VPN backup remains up but does not advertise required corporate prefixes.

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: Private applications remain reachable during a planned single-tunnel outage with an auditable failover timeline. Scenario: Both IPsec tunnels show UP in the AWS console, but one lacks the private BGP routes needed to carry return traffic to headquarters.

Validating public resolvers accept authentic DNS responses without SERVFAIL caused by stale delegation. That result supports Route 53 DNSSEC public signing and delegation but does not establish the requested networking outcome here. Instead verify: Private applications remain reachable during a planned single-tunnel outage with an auditable failover timeline. Scenario: Both IPsec tunnels show UP in the AWS console, but one lacks the private BGP routes needed to carry return traffic to headquarters.

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: Private applications remain reachable during a planned single-tunnel outage with an auditable failover timeline. Scenario: Both IPsec tunnels show UP in the AWS console, but one lacks the private BGP routes needed to carry return traffic to headquarters.

Inspect listener certificates and policies, backend protocol, negotiated versions, target TLS configuration and end-to-end packet paths. These checks are primarily associated with TLS termination and backend encryption with load balancers; they are less discriminating for this case. The relevant checks are: Examine listener protocol, target group protocol, NLB zonal IP mappings, health check and traffic distribution behavior. Scenario: A proprietary trading protocol uses persistent non-HTTP TCP connections and partners demand allowlisted static addresses for ingress.

Inspect logging attachment scope, aggregation interval, source and destination fields, action, log status and delivery destination. These checks are primarily associated with VPC Flow Logs monitoring coverage and fields; they are less discriminating for this case. The relevant checks are: Examine listener protocol, target group protocol, NLB zonal IP mappings, health check and traffic distribution behavior. Scenario: A proprietary trading protocol uses persistent non-HTTP TCP connections and partners demand allowlisted static addresses for ingress.

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: Examine listener protocol, target group protocol, NLB zonal IP mappings, health check and traffic distribution behavior. Scenario: A proprietary trading protocol uses persistent non-HTTP TCP connections and partners demand allowlisted static addresses for ingress.

Maintain interface endpoints and provider endpoint services, monitoring acceptance, DNS, endpoint ENI and health as accounts and subnet memberships change. That approach addresses Service-specific PrivateLink endpoint lifecycle instead of the principal requirement here. Deleting or replacing a provider endpoint service changes service connectivity; an interface endpoint is not a generic peering connection. The better fit for this scenario is: Maintain BGP sessions on Direct Connect private or transit VIFs with documented prefix filters, routing preferences and alert thresholds. Scenario: A Direct Connect BGP peer stays Established after a maintenance event but the on-premises router stops advertising a branch subnet.

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 BGP sessions on Direct Connect private or transit VIFs with documented prefix filters, routing preferences and alert thresholds. Scenario: A Direct Connect BGP peer stays Established after a maintenance event but the on-premises router stops advertising a branch subnet.

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 BGP sessions on Direct Connect private or transit VIFs with documented prefix filters, routing preferences and alert thresholds. Scenario: A Direct Connect BGP peer stays Established after a maintenance event but the on-premises router stops advertising a branch subnet.

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.