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Provision a Direct Connect connection through the authorized location, complete cross-connect paperwork, and configure VIF VLAN tagging and compatible BGP peering. That approach addresses Direct Connect LOA VLAN and BGP bring-up instead of the principal requirement here. Physical port UP alone cannot prove a virtual interface is configured or that BGP exchanges the intended routes. The better fit for this scenario is: Connect appropriate private or transit VIFs through a Direct Connect gateway and supported gateway associations, enforcing allowed prefixes and account boundaries. Scenario: A project attaches an incompatible VIF type to a routing arrangement and assumes any DX gateway can route public internet traffic into private subnets.

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. That approach addresses VPN over Direct Connect for encrypted hybrid connectivity instead of the principal requirement here. Direct Connect offers a dedicated network link but does not itself guarantee data-plane encryption; VPN overhead also affects MTU and throughput. The better fit for this scenario is: Connect appropriate private or transit VIFs through a Direct Connect gateway and supported gateway associations, enforcing allowed prefixes and account boundaries. Scenario: A project attaches an incompatible VIF type to a routing arrangement and assumes any DX gateway can route public internet traffic into private subnets.

Configure supported Route 53 routing policies and records with stable identifiers, expected health checks, weights or latency policies and appropriate TTLs. That approach addresses Weighted latency and failover Route 53 records instead of the principal requirement here. Route 53 weighted DNS divides answered queries probabilistically, not individual TCP sessions or exact HTTP request shares. The better fit for this scenario is: Connect appropriate private or transit VIFs through a Direct Connect gateway and supported gateway associations, enforcing allowed prefixes and account boundaries. Scenario: A project attaches an incompatible VIF type to a routing arrangement and assumes any DX gateway can route public internet traffic into private subnets.

Check transport attachment, Connect peer GRE outer IPs, inside BGP address allocation, advertised routes and TGW routing tables. These checks are primarily associated with Transit Gateway Connect peer implementation; they are less discriminating for this case. The relevant checks are: Inspect DX gateway associations, attached transit or virtual private gateway, allowed prefixes, VIF type, BGP advertisements and quota constraints. Scenario: A company uses one DX gateway for several regions but forgets to authorize one account's association and its new VPC is unreachable.

Inspect tunnel outside IPs, IKE/IPsec phases, tunnel status, BGP peers, advertised CIDRs and gateway route preference. These checks are primarily associated with Site-to-Site VPN two tunnel routing; they are less discriminating for this case. The relevant checks are: Inspect DX gateway associations, attached transit or virtual private gateway, allowed prefixes, VIF type, BGP advertisements and quota constraints. Scenario: A company uses one DX gateway for several regions but forgets to authorize one account's association and its new VPC is unreachable.

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 DX gateway associations, attached transit or virtual private gateway, allowed prefixes, VIF type, BGP advertisements and quota constraints. Scenario: A company uses one DX gateway for several regions but forgets to authorize one account's association and its new VPC is unreachable.

Model reusable VPC and routing constructs with AWS CDK while keeping account/Region-specific values and synthesized CloudFormation templates reviewed. That approach addresses AWS CDK network configuration and environment context instead of the principal requirement here. CDK synthesis generates infrastructure templates; application code passing unit tests does not alone prove a network change is safe at deploy time. The better fit for this scenario is: Connect appropriate private or transit VIFs through a Direct Connect gateway and supported gateway associations, enforcing allowed prefixes and account boundaries. Scenario: A company uses one DX gateway for several regions but forgets to authorize one account's association and its new VPC is unreachable.

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. That approach addresses VPN over Direct Connect for encrypted hybrid connectivity instead of the principal requirement here. Direct Connect offers a dedicated network link but does not itself guarantee data-plane encryption; VPN overhead also affects MTU and throughput. The better fit for this scenario is: Connect appropriate private or transit VIFs through a Direct Connect gateway and supported gateway associations, enforcing allowed prefixes and account boundaries. Scenario: A company uses one DX gateway for several regions but forgets to authorize one account's association and its new VPC is unreachable.

Share supported Transit Gateway attachments or subnets through AWS RAM with correct organization and account authorization and maintain central network ownership. That approach addresses AWS RAM shared networking across accounts instead of the principal requirement here. Sharing a TGW or VPC subnet delegates specific resource use, not blanket administrator rights over the network owner's resources. The better fit for this scenario is: Connect appropriate private or transit VIFs through a Direct Connect gateway and supported gateway associations, enforcing allowed prefixes and account boundaries. Scenario: A company uses one DX gateway for several regions but forgets to authorize one account's association and its new VPC is unreachable.

Use AWS CloudFormation parameters, mappings, conditions and tested stack updates to declare consistent VPC CIDRs, subnets and routing rather than hardcoding every environment. This choice relates to CloudFormation parameterized network templates, not the complementary response and evidence pair for the case. Prefer: Detect network drift from declared infrastructure using CloudFormation drift detection, AWS Config and controlled reconciliation before applying corrections. Confirm with: Inspect resource configuration timeline, CloudFormation stack state, Config evaluation, rule evidence and change approval records. Scenario: A production subnet route is modified during an incident, but the Git-owned IaC template still declares the earlier path and no drift audit notices.

Authorized spokes reach shared services while protected environments lack unintended transitive reachability. This choice relates to Transit Gateway attachment routing associations and propagation, not the complementary response and evidence pair for the case. Prefer: Detect network drift from declared infrastructure using CloudFormation drift detection, AWS Config and controlled reconciliation before applying corrections. Confirm with: Inspect resource configuration timeline, CloudFormation stack state, Config evaluation, rule evidence and change approval records. Scenario: A production subnet route is modified during an incident, but the Git-owned IaC template still declares the earlier path and no drift audit notices.

Examine AWS RAM resource shares, acceptance state, organizational sharing, central route tables, participant permissions and audit events. This choice relates to AWS RAM shared networking across accounts, not the complementary response and evidence pair for the case. Prefer: Detect network drift from declared infrastructure using CloudFormation drift detection, AWS Config and controlled reconciliation before applying corrections. Confirm with: Inspect resource configuration timeline, CloudFormation stack state, Config evaluation, rule evidence and change approval records. Scenario: A production subnet route is modified during an incident, but the Git-owned IaC template still declares the earlier path and no drift audit notices.

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 listener ports, endpoint weights, health status, client path, AWS edge entry and endpoint-group traffic dials. Scenario: A B2B SaaS partner allowlists two public IPs and cannot maintain changing regional load balancer DNS addresses during disaster recovery.

Compare cache policy headers, cookies and query parameters, origin request policy, cache status and response variants. These checks are primarily associated with CloudFront cache key and origin request policies; they are less discriminating for this case. The relevant checks are: Inspect listener ports, endpoint weights, health status, client path, AWS edge entry and endpoint-group traffic dials. Scenario: A B2B SaaS partner allowlists two public IPs and cannot maintain changing regional load balancer DNS addresses during disaster recovery.

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 listener ports, endpoint weights, health status, client path, AWS edge entry and endpoint-group traffic dials. Scenario: A B2B SaaS partner allowlists two public IPs and cannot maintain changing regional load balancer DNS addresses during disaster recovery.

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: New DNS resolutions follow the intended healthy routing plan while cache delays and client persistence are documented. Scenario: A service has two AWS regions and wants routing near the user, but operations use weighted policies and assume they guarantee lowest latency.

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: New DNS resolutions follow the intended healthy routing plan while cache delays and client persistence are documented. Scenario: A service has two AWS regions and wants routing near the user, but operations use weighted policies and assume they guarantee lowest latency.

Detected policy changes produce controlled auditable corrections without duplicated actions or broad unauthorized routing changes. That result supports EventBridge and Lambda network change reaction but does not establish the requested networking outcome here. Instead verify: New DNS resolutions follow the intended healthy routing plan while cache delays and client persistence are documented. Scenario: A service has two AWS regions and wants routing near the user, but operations use weighted policies and assume they guarantee lowest latency.

Select Route 53 failover, weighted, latency or geolocation routing based on explicit objective, and pair failover records with supported health evaluation. That approach addresses Route 53 health check and routing policy design instead of the principal requirement here. DNS policy decisions are DNS responses; existing client connections and resolver caches do not instantly move just because health status changes. The better fit for this scenario is: Exchange only intended CIDR prefixes through BGP and use supported local-pref, AS-path or AWS community options according to direction of traffic control. Scenario: A data center engineer changes only a local router metric and expects AWS to select the same tunnel as preferred for traffic returning to the branch.

Configure Route 53 Resolver outbound endpoints with conditional forwarding rules for on-premises domains from associated VPCs. That approach addresses Route 53 Resolver outbound endpoint for corporate domains instead of the principal requirement here. An outbound endpoint initiates AWS-side forwarding to target DNS servers; inbound endpoints serve the reverse hybrid query direction. The better fit for this scenario is: Exchange only intended CIDR prefixes through BGP and use supported local-pref, AS-path or AWS community options according to direction of traffic control. Scenario: A data center engineer changes only a local router metric and expects AWS to select the same tunnel as preferred for traffic returning to the branch.

Design nonoverlapping hybrid address ranges and verify path MTU, packet fragmentation and IPsec overhead across Direct Connect or VPN as applicable. That approach addresses Hybrid IP plan and MTU path constraints instead of the principal requirement here. Additional encapsulation can reduce effective MTU; a successful small ping is not proof that large application packets traverse the hybrid path. The better fit for this scenario is: Exchange only intended CIDR prefixes through BGP and use supported local-pref, AS-path or AWS community options according to direction of traffic control. Scenario: A data center engineer changes only a local router metric and expects AWS to select the same tunnel as preferred for traffic returning to the branch.

Configure supported AWS Site-to-Site VPN encryption with IKE/IPsec parameters, approved customer-gateway algorithms and monitored tunnel state for hybrid traffic. That approach addresses IPsec Site-to-Site VPN for network encryption instead of the principal requirement here. Encrypted tunnels protect traffic on their encapsulated path; an unencrypted Direct Connect physical link by itself does not fulfill an IPsec requirement. 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: An engineer sees a stateful security group allow incoming HTTPS and unnecessarily opens every outbound ephemeral destination port without understanding return-state tracking.

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: An engineer sees a stateful security group allow incoming HTTPS and unnecessarily opens every outbound ephemeral destination port without understanding return-state tracking.

Use supported VPC endpoint policies, identity policies and SG restrictions to govern access to AWS services without unrestricted internet traversal. That approach addresses Endpoint policies and least-privilege private egress instead of the principal requirement here. An endpoint policy complements IAM and resource-based policies; an endpoint existing does not grant every caller access to every AWS API action. 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: An engineer sees a stateful security group allow incoming HTTPS and unnecessarily opens every outbound ephemeral destination port without understanding return-state tracking.

Inspect mirror session filters, target status, capture timestamps, TCP retransmits, sequence numbers, MTU and traffic sampling. These checks are primarily associated with Traffic Mirroring packet captures for retransmission analysis; they are less discriminating for this case. The relevant checks are: Inspect subnet available address counts, network interface consumption, load balancer scale events, CNI IP allocation and VPC CIDR associations. Scenario: An architect adds a secondary VPC CIDR and assumes existing subnet sizes will automatically expand without creating new subnets.

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: Inspect subnet available address counts, network interface consumption, load balancer scale events, CNI IP allocation and VPC CIDR associations. Scenario: An architect adds a secondary VPC CIDR and assumes existing subnet sizes will automatically expand without creating new subnets.

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 subnet available address counts, network interface consumption, load balancer scale events, CNI IP allocation and VPC CIDR associations. Scenario: An architect adds a secondary VPC CIDR and assumes existing subnet sizes will automatically expand without creating new subnets.

Inspect VIF type, VLAN and BGP peer addresses, advertised AWS prefixes, DX gateway attachment and target endpoint type. This choice relates to Direct Connect private and public VIF selection, not the complementary response and evidence pair for the case. Prefer: Design nonoverlapping hybrid address ranges and verify path MTU, packet fragmentation and IPsec overhead across Direct Connect or VPN as applicable. Confirm with: Inspect CIDR allocations, route specificity, tunnel MTU/MSS, DF-bit behavior, ICMP fragmentation messages and traces. Scenario: A private Oracle replication link passes 64-byte pings but large TLS records stall through a VPN with blocked Path MTU Discovery responses.

Design geographically or device-diverse Direct Connect paths with an independent VPN option based on recovery needs and routing behavior. This choice relates to Direct Connect plus VPN hybrid resilience, not the complementary response and evidence pair for the case. Prefer: Design nonoverlapping hybrid address ranges and verify path MTU, packet fragmentation and IPsec overhead across Direct Connect or VPN as applicable. Confirm with: Inspect CIDR allocations, route specificity, tunnel MTU/MSS, DF-bit behavior, ICMP fragmentation messages and traces. Scenario: A private Oracle replication link passes 64-byte pings but large TLS records stall through a VPN with blocked Path MTU Discovery responses.

Operators distinguish registered network inventory and observed link health from unsupported assumptions about end-to-end application reachability. This choice relates to Transit Gateway Network Manager topology visibility, not the complementary response and evidence pair for the case. Prefer: Design nonoverlapping hybrid address ranges and verify path MTU, packet fragmentation and IPsec overhead across Direct Connect or VPN as applicable. Confirm with: Inspect CIDR allocations, route specificity, tunnel MTU/MSS, DF-bit behavior, ICMP fragmentation messages and traces. Scenario: A private Oracle replication link passes 64-byte pings but large TLS records stall through a VPN with blocked Path MTU Discovery responses.

Review endpoint state, service accepted principals, endpoint policies, private DNS, SG reachability and target NLB status. This choice relates to Service-specific PrivateLink endpoint lifecycle, not the complementary response and evidence pair for the case. Prefer: Diagnose packet-size failures using trace and controlled packet tests, appropriate TCP MSS adjustment, and allowance for ICMP Packet Too Big behavior. Confirm with: Inspect DF-bit probes, ICMP fragmentation feedback, tunnel encapsulation, ENI MTU, jumbo frame support and packet traces. Scenario: A new jumbo frame setting on one VPC instance worsens intermittent packet loss through a smaller-MTU transit device.

Capture supported EC2 ENI traffic through VPC Traffic Mirroring into controlled analysis infrastructure when packet contents or flags are needed. This choice relates to Traffic Mirroring packet captures for retransmission analysis, not the complementary response and evidence pair for the case. Prefer: Diagnose packet-size failures using trace and controlled packet tests, appropriate TCP MSS adjustment, and allowance for ICMP Packet Too Big behavior. Confirm with: Inspect DF-bit probes, ICMP fragmentation feedback, tunnel encapsulation, ENI MTU, jumbo frame support and packet traces. Scenario: A new jumbo frame setting on one VPC instance worsens intermittent packet loss through a smaller-MTU transit device.

Approved networks remain reachable through correct hybrid paths and BGP instability is detected before broad service impact. This choice relates to Direct Connect BGP neighbor monitoring and route changes, not the complementary response and evidence pair for the case. Prefer: Diagnose packet-size failures using trace and controlled packet tests, appropriate TCP MSS adjustment, and allowance for ICMP Packet Too Big behavior. Confirm with: Inspect DF-bit probes, ICMP fragmentation feedback, tunnel encapsulation, ENI MTU, jumbo frame support and packet traces. Scenario: A new jumbo frame setting on one VPC instance worsens intermittent packet loss through a smaller-MTU transit device.