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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: Configure both AWS Site-to-Site VPN tunnels with appropriate BGP or supported static prefixes and validate routing failover on each customer gateway. Confirm with: Inspect tunnel outside IPs, IKE/IPsec phases, tunnel status, BGP peers, advertised CIDRs and gateway route preference. Scenario: A branch firewall brings up the first AWS VPN tunnel but ignores the second and a maintenance event interrupts every private service.

A precisely scoped application exchange succeeds without pretending overlapping private routes can coexist unmodified in one TGW routing domain. This choice relates to Overlapping CIDR workaround with service-specific endpoints, not the complementary response and evidence pair for the case. Prefer: Configure both AWS Site-to-Site VPN tunnels with appropriate BGP or supported static prefixes and validate routing failover on each customer gateway. Confirm with: Inspect tunnel outside IPs, IKE/IPsec phases, tunnel status, BGP peers, advertised CIDRs and gateway route preference. Scenario: A branch firewall brings up the first AWS VPN tunnel but ignores the second and a maintenance event interrupts every private service.

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: Configure both AWS Site-to-Site VPN tunnels with appropriate BGP or supported static prefixes and validate routing failover on each customer gateway. Confirm with: Inspect tunnel outside IPs, IKE/IPsec phases, tunnel status, BGP peers, advertised CIDRs and gateway route preference. Scenario: A branch firewall brings up the first AWS VPN tunnel but ignores the second and a maintenance event interrupts every private service.

Use AWS CloudFormation parameters, mappings, conditions and tested stack updates to declare consistent VPC CIDRs, subnets and routing rather than hardcoding every environment. That approach addresses CloudFormation parameterized network templates instead of the principal requirement here. Hardcoded overlapping subnet CIDRs cause failures when IaC is reused; a successful stack create is not proof of suitable future network capacity. The better fit for this scenario is: Gate network IaC deployment on route reachability tests, reviewed changes, canary application checks and documented rollback with independent health metrics. Scenario: Engineers replace a central Transit Gateway route table in one operation and lose all branch connectivity because no staged rollout or rollback was prepared.

Create supported Transit Gateway Connect attachments and peers over underlying VPC or Direct Connect transports using GRE and BGP. That approach addresses Transit Gateway Connect peer implementation instead of the principal requirement here. TGW Connect encapsulates traffic using GRE and runs dynamic BGP; merely creating a Connect attachment does not make a branch advertise its networks. The better fit for this scenario is: Gate network IaC deployment on route reachability tests, reviewed changes, canary application checks and documented rollback with independent health metrics. Scenario: Engineers replace a central Transit Gateway route table in one operation and lose all branch connectivity because no staged rollout or rollback was prepared.

Create Route 53 Resolver outbound endpoint forwarding rules for intended internal domain suffixes and associate rules with every consuming VPC. That approach addresses Resolver outbound rule with conditional corporate forwarding instead of the principal requirement here. Outbound Resolver endpoints initiate DNS forwarding from AWS VPCs; an inbound endpoint alone does not redirect AWS-origin queries to corporate DNS. The better fit for this scenario is: Gate network IaC deployment on route reachability tests, reviewed changes, canary application checks and documented rollback with independent health metrics. Scenario: Engineers replace a central Transit Gateway route table in one operation and lose all branch connectivity because no staged rollout or rollback was prepared.

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: Check transport attachment, Connect peer GRE outer IPs, inside BGP address allocation, advertised routes and TGW routing tables. Scenario: A managed SD-WAN appliance reaches the TGW underlying transport but no branch CIDRs appear because the GRE/BGP peer configuration is incomplete.

Inspect DX gateway associations, attached transit or virtual private gateway, allowed prefixes, VIF type, BGP advertisements and quota constraints. These checks are primarily associated with Direct Connect gateway and association limits; they are less discriminating for this case. The relevant checks are: Check transport attachment, Connect peer GRE outer IPs, inside BGP address allocation, advertised routes and TGW routing tables. Scenario: A managed SD-WAN appliance reaches the TGW underlying transport but no branch CIDRs appear because the GRE/BGP peer configuration is incomplete.

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: Check transport attachment, Connect peer GRE outer IPs, inside BGP address allocation, advertised routes and TGW routing tables. Scenario: A managed SD-WAN appliance reaches the TGW underlying transport but no branch CIDRs appear because the GRE/BGP peer configuration is incomplete.

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 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 peering attachment state, both TGW routing tables, inter-Region CIDRs and destination route entries. These checks are primarily associated with Inter-Region Transit Gateway peering routes; they are less discriminating for this case. The relevant checks are: 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 peering status, both VPC route tables, security groups, network ACLs and conflicting CIDR ranges. These checks are primarily associated with VPC peering nontransitive routing; they are less discriminating for this case. The relevant checks are: 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.

Use AWS Global Accelerator static anycast IPs with regional endpoint groups when global clients require managed network routing and fast endpoint failover. That approach addresses AWS Global Accelerator anycast ingress instead of the principal requirement here. Global Accelerator optimizes TCP or UDP network paths and health-based routing; it is not the same as CloudFront content-object caching. The better fit for this scenario is: Separate viewer cache-key dimensions from values forwarded to origins, and include only request values that change the actual representation. 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.

Configure a supported CloudFront origin group with appropriate primary, secondary and origin-failover status codes for eligible requests. That approach addresses CloudFront origin groups and failover behavior instead of the principal requirement here. CloudFront origin failover applies to supported requests and configured status conditions; it is not arbitrary active-active traffic distribution. The better fit for this scenario is: Separate viewer cache-key dimensions from values forwarded to origins, and include only request values that change the actual representation. 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.

Design geographically or device-diverse Direct Connect paths with an independent VPN option based on recovery needs and routing behavior. That approach addresses Direct Connect plus VPN hybrid resilience instead of the principal requirement here. A single Direct Connect location is a potential failure domain; a configured VPN is not redundant unless routing, capacity and failover are tested. The better fit for this scenario is: Separate viewer cache-key dimensions from values forwarded to origins, and include only request values that change the actual representation. 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.

Enable DNSSEC signing for supported Route 53 public hosted zones and publish matching DS records at the parent registrar when the signed delegation is ready. That approach addresses Route 53 DNSSEC public signing and delegation instead of the principal requirement here. DNSSEC signs DNS data integrity but does not encrypt queries or provide a DNSSEC signing feature for Route 53 private hosted zones. The better fit for this scenario is: Configure both AWS Site-to-Site VPN tunnels with appropriate BGP or supported static prefixes and validate routing failover on each customer gateway. Scenario: A branch firewall brings up the first AWS VPN tunnel but ignores the second and a maintenance event interrupts every private service.

Connect appropriate private or transit VIFs through a Direct Connect gateway and supported gateway associations, enforcing allowed prefixes and account boundaries. That approach addresses Direct Connect gateway and association limits instead of the principal requirement here. A Direct Connect gateway is a routing association construct; it does not automatically permit every VPC or encrypt link traffic. The better fit for this scenario is: Configure both AWS Site-to-Site VPN tunnels with appropriate BGP or supported static prefixes and validate routing failover on each customer gateway. Scenario: A branch firewall brings up the first AWS VPN tunnel but ignores the second and a maintenance event interrupts every private service.

Create supported Transit Gateway Connect attachments and peers over underlying VPC or Direct Connect transports using GRE and BGP. That approach addresses Transit Gateway Connect peer implementation instead of the principal requirement here. TGW Connect encapsulates traffic using GRE and runs dynamic BGP; merely creating a Connect attachment does not make a branch advertise its networks. The better fit for this scenario is: Configure both AWS Site-to-Site VPN tunnels with appropriate BGP or supported static prefixes and validate routing failover on each customer gateway. Scenario: A branch firewall brings up the first AWS VPN tunnel but ignores the second and a maintenance event interrupts every private service.

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 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. This choice relates to Traffic Mirroring forensic capture access governance, 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 cross-account log pipeline lacks delivery permissions and an auditor assumes no events occurred because the central dashboard is empty.

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 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 cross-account log pipeline lacks delivery permissions and an auditor assumes no events occurred because the central dashboard is empty.

Inspect private zone ID, creating account, association authorization, resource share, VPC ownership, DNS query path and restrictions. These checks are primarily associated with Cross-account private DNS hosted zone associations; they are less discriminating for this case. The relevant checks are: Examine AWS RAM resource shares, acceptance state, organizational sharing, central route tables, participant permissions and audit events. Scenario: A new business unit cannot create an attachment to a centrally owned Transit Gateway because it did not accept the AWS RAM invitation.

Inspect attachment associations, route propagation, blackhole entries, VPC subnet route tables, CIDRs and accepted traffic path. These checks are primarily associated with Transit Gateway attachment routing associations and propagation; they are less discriminating for this case. The relevant checks are: Examine AWS RAM resource shares, acceptance state, organizational sharing, central route tables, participant permissions and audit events. Scenario: A new business unit cannot create an attachment to a centrally owned Transit Gateway because it did not accept the AWS RAM invitation.

Compare CDK context values, synthesized resources, environment references, stack dependencies and deployed change sets. These checks are primarily associated with AWS CDK network configuration and environment context; they are less discriminating for this case. The relevant checks are: Examine AWS RAM resource shares, acceptance state, organizational sharing, central route tables, participant permissions and audit events. Scenario: A new business unit cannot create an attachment to a centrally owned Transit Gateway because it did not accept the AWS RAM invitation.

Investigators follow an authorized request across edge and origin layers while limiting retention of identifiers and sensitive headers. That result supports ELB CloudFront and Route 53 log correlation but does not establish the requested networking outcome here. Instead verify: Analysts can correlate allowed or rejected flow records for selected network interfaces without claiming packet payload capture. 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.

The hybrid link carries only the intended private or public AWS routes under authorized policies. That result supports Direct Connect private and public VIF selection but does not establish the requested networking outcome here. Instead verify: Analysts can correlate allowed or rejected flow records for selected network interfaces without claiming packet payload capture. 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.

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: Analysts can correlate allowed or rejected flow records for selected network interfaces without claiming packet payload capture. 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.

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 issuing CA hierarchy, certificate templates and subject names, trust store, revocation strategy and endpoint handshake logs. Scenario: A platform rotates an intermediate CA without updating service trust bundles, causing internal API calls to fail across several accounts.

Inspect GWLBe subnet routes, GWLB target health, GENEVE tunnel behavior, appliance state and AZ-specific return paths. These checks are primarily associated with Gateway Load Balancer centralized inspection and symmetry; they are less discriminating for this case. The relevant checks are: Inspect issuing CA hierarchy, certificate templates and subject names, trust store, revocation strategy and endpoint handshake logs. Scenario: A platform rotates an intermediate CA without updating service trust bundles, causing internal API calls to fail across several accounts.

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 issuing CA hierarchy, certificate templates and subject names, trust store, revocation strategy and endpoint handshake logs. Scenario: A platform rotates an intermediate CA without updating service trust bundles, causing internal API calls to fail across several accounts.

Data-center clients can resolve the intended AWS private names while unrelated public resolvers still do not publish those records. That result supports Resolver inbound endpoint for AWS private zone access but does not establish the requested networking outcome here. Instead verify: EC2 and container workloads in associated VPCs correctly resolve corporate names through approved forwarding infrastructure. 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.

Private applications remain reachable during a planned single-tunnel outage with an auditable failover timeline. That result supports Site-to-Site VPN two tunnel routing but does not establish the requested networking outcome here. Instead verify: EC2 and container workloads in associated VPCs correctly resolve corporate names through approved forwarding infrastructure. 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.

Authorized workload accounts resolve shared private services without publishing internal hostnames to the open internet. That result supports Cross-account private DNS hosted zone associations but does not establish the requested networking outcome here. Instead verify: EC2 and container workloads in associated VPCs correctly resolve corporate names through approved forwarding infrastructure. 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.