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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.

Use Transit Gateway Connect attachments with GRE and BGP for supported SD-WAN appliance integration and define matching routing and appliance readiness. That approach addresses Transit Gateway Connect integration for SD-WAN instead of the principal requirement here. Transit Gateway Connect is not an arbitrary layer-two bridge; it overlays GRE and BGP over an underlying transport attachment. The better fit for this scenario is: Use Transit Gateway attachments and explicit routing tables to connect many nonoverlapping VPCs in a scalable hub-and-spoke model. Scenario: A company separates regulated and development VPCs but associates all attachments with a common TGW route table and accidentally enables broad transitive paths.

Use VPC sharing with AWS Resource Access Manager to centralize network-owner subnet management while participants deploy supported resources. That approach addresses Shared VPC subnet administration via AWS RAM instead of the principal requirement here. In VPC sharing the VPC owner controls core networking; participants cannot arbitrarily change the central VPC's network resources. The better fit for this scenario is: Use Transit Gateway attachments and explicit routing tables to connect many nonoverlapping VPCs in a scalable hub-and-spoke model. Scenario: A company separates regulated and development VPCs but associates all attachments with a common TGW route table and accidentally enables broad transitive paths.

Establish CloudWatch alarms and dashboards for measured packet loss, target errors, throughput and connectivity indicators with meaningful baselines. That approach addresses CloudWatch alarm baselines for network health instead of the principal requirement here. CloudWatch alarms evaluate metric streams over periods; a green dashboard does not verify an absent metric is collecting meaningful data. The better fit for this scenario is: Use Transit Gateway attachments and explicit routing tables to connect many nonoverlapping VPCs in a scalable hub-and-spoke model. Scenario: A company separates regulated and development VPCs but associates all attachments with a common TGW route table and accidentally enables broad transitive paths.

Examine AWS RAM resource shares, acceptance state, organizational sharing, central route tables, participant permissions and audit events. These checks are primarily associated with AWS RAM shared networking across accounts; they are less discriminating for this case. The relevant checks are: Inspect outbound endpoint status, corporate DNS targets, rule priority and domain suffix, VPC rule associations, UDP/TCP 53 security groups and query logs. Scenario: An internal application migrates into a new AWS account and cannot resolve corp.example.internal because the corporate forwarding rule is not associated with its VPC.

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 outbound endpoint status, corporate DNS targets, rule priority and domain suffix, VPC rule associations, UDP/TCP 53 security groups and query logs. Scenario: An internal application migrates into a new AWS account and cannot resolve corp.example.internal because the corporate forwarding rule is not associated with its VPC.

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 outbound endpoint status, corporate DNS targets, rule priority and domain suffix, VPC rule associations, UDP/TCP 53 security groups and query logs. Scenario: An internal application migrates into a new AWS account and cannot resolve corp.example.internal because the corporate forwarding rule is not associated with its VPC.

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: Apply least-privilege security groups to ENIs and deliberate subnet network ACL rules while accounting for stateful return behavior and stateless ephemeral ports. Confirm with: Inspect SG inbound/outbound permissions, NACL ordered entries, ephemeral response ports, flow logs and approved test connections. Scenario: A database SG allows access from a security group attached to the authorized app instances but a troubleshooting team changes it to 0.0.0.0/0 for convenience.

Authorized internal endpoints authenticate each other through controlled trust anchors and expired or revoked identities are rejected. This choice relates to AWS Private CA service-to-service TLS and rotation, not the complementary response and evidence pair for the case. Prefer: Apply least-privilege security groups to ENIs and deliberate subnet network ACL rules while accounting for stateful return behavior and stateless ephemeral ports. Confirm with: Inspect SG inbound/outbound permissions, NACL ordered entries, ephemeral response ports, flow logs and approved test connections. Scenario: A database SG allows access from a security group attached to the authorized app instances but a troubleshooting team changes it to 0.0.0.0/0 for convenience.

Inspect GWLBe subnet routes, GWLB target health, GENEVE tunnel behavior, appliance state and AZ-specific return paths. This choice relates to Gateway Load Balancer centralized inspection and symmetry, not the complementary response and evidence pair for the case. Prefer: Apply least-privilege security groups to ENIs and deliberate subnet network ACL rules while accounting for stateful return behavior and stateless ephemeral ports. Confirm with: Inspect SG inbound/outbound permissions, NACL ordered entries, ephemeral response ports, flow logs and approved test connections. Scenario: A database SG allows access from a security group attached to the authorized app instances but a troubleshooting team changes it to 0.0.0.0/0 for convenience.

Review each CIDR block, required protocol/direction, endpoint DNS, NAT translations if used, and reachability verification. These checks are primarily associated with Overlapping CIDR workaround with service-specific endpoints; they are less discriminating for this case. The relevant checks are: Inspect endpoint ENI addresses, service name, endpoint acceptance status, subnet placement, security-group inbound ports and DNS resolution. Scenario: An endpoint service owner requires manual acceptance, yet a consumer treats the initial pendingAcceptance state as an active private connection.

Verify peering requester and accepter status, source/destination route tables, accepted peer CIDRs and SG/NACL rules. These checks are primarily associated with VPC peering routes and security controls; they are less discriminating for this case. The relevant checks are: Inspect endpoint ENI addresses, service name, endpoint acceptance status, subnet placement, security-group inbound ports and DNS resolution. Scenario: An endpoint service owner requires manual acceptance, yet a consumer treats the initial pendingAcceptance state as an active private connection.

Validate inbound endpoint addresses, network routing, on-prem conditional DNS forwarder configuration, zone association and resolver query logs. These checks are primarily associated with Resolver inbound endpoint for AWS private zone access; they are less discriminating for this case. The relevant checks are: Inspect endpoint ENI addresses, service name, endpoint acceptance status, subnet placement, security-group inbound ports and DNS resolution. Scenario: An endpoint service owner requires manual acceptance, yet a consumer treats the initial pendingAcceptance state as an active private connection.

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: Review circuit locations, DX virtual interfaces, advertised BGP prefixes, VPN tunnel health, failover tests and route priorities. Scenario: A manufacturer runs critical private workloads through one Direct Connect cross-connect and loses every branch-to-cloud connection when that facility goes offline.

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: Review circuit locations, DX virtual interfaces, advertised BGP prefixes, VPN tunnel health, failover tests and route priorities. Scenario: A manufacturer runs critical private workloads through one Direct Connect cross-connect and loses every branch-to-cloud connection when that facility goes offline.

Examine Connect peer IPs, GRE tunnels, BGP neighbors, Transit Gateway associations and propagated routes. These checks are primarily associated with Transit Gateway Connect integration for SD-WAN; they are less discriminating for this case. The relevant checks are: Review circuit locations, DX virtual interfaces, advertised BGP prefixes, VPN tunnel health, failover tests and route priorities. Scenario: A manufacturer runs critical private workloads through one Direct Connect cross-connect and loses every branch-to-cloud connection when that facility goes offline.

Choose a Network Load Balancer for supported TCP, TLS, UDP or TCP_UDP traffic and zonal static-address requirements. This choice relates to Network Load Balancer TCP UDP and static addresses, not the complementary response and evidence pair for the case. Prefer: Select an Application Load Balancer with HTTP host/path rules and AWS WAF integration for public layer-seven web applications. Confirm with: Inspect listeners, priority ordered rules, target groups, forwarded headers, ALB access logs and web ACL association. Scenario: A security team needs to apply a web ACL to an HTTPS application behind a managed load balancer and chooses a product without WAF integration.

Eligible requests fail over to a healthy secondary origin without treating unsupported request methods as automatically retried. This choice relates to CloudFront origin groups and failover behavior, not the complementary response and evidence pair for the case. Prefer: Select an Application Load Balancer with HTTP host/path rules and AWS WAF integration for public layer-seven web applications. Confirm with: Inspect listeners, priority ordered rules, target groups, forwarded headers, ALB access logs and web ACL association. Scenario: A security team needs to apply a web ACL to an HTTPS application behind a managed load balancer and chooses a product without WAF integration.

Inspect listener certificates and policies, backend protocol, negotiated versions, target TLS configuration and end-to-end packet paths. This choice relates to TLS termination and backend encryption with load balancers, not the complementary response and evidence pair for the case. Prefer: Select an Application Load Balancer with HTTP host/path rules and AWS WAF integration for public layer-seven web applications. Confirm with: Inspect listeners, priority ordered rules, target groups, forwarded headers, ALB access logs and web ACL association. Scenario: A security team needs to apply a web ACL to an HTTPS application behind a managed load balancer and chooses a product without WAF integration.

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: Examine routing policy, alias evaluation, health checks, regional endpoints, resolver cache behavior and observed DNS answers. Scenario: A staged migration uses 10:90 weighted records and a project manager expects precisely ten percent of every application's HTTP requests to reach the canary immediately.

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: Examine routing policy, alias evaluation, health checks, regional endpoints, resolver cache behavior and observed DNS answers. Scenario: A staged migration uses 10:90 weighted records and a project manager expects precisely ten percent of every application's HTTP requests to reach the canary immediately.

Inspect outbound endpoint status, corporate DNS targets, rule priority and domain suffix, VPC rule associations, UDP/TCP 53 security groups and query logs. These checks are primarily associated with Resolver outbound rule with conditional corporate forwarding; they are less discriminating for this case. The relevant checks are: Examine routing policy, alias evaluation, health checks, regional endpoints, resolver cache behavior and observed DNS answers. Scenario: A staged migration uses 10:90 weighted records and a project manager expects precisely ten percent of every application's HTTP requests to reach the canary immediately.

Network-intensive workloads obtain measured throughput and latency without assuming a specialized HPC interface benefits ordinary web traffic. That result supports ENA EFA and network-adapter performance selection but does not establish the requested networking outcome here. Instead verify: Only intended multicast group members receive application traffic under supported topology and security constraints. Scenario: A multicast group is created but receivers are not correctly registered or associated with the supporting Transit Gateway multicast domain.

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: Only intended multicast group members receive application traffic under supported topology and security constraints. Scenario: A multicast group is created but receivers are not correctly registered or associated with the supporting Transit Gateway multicast domain.

Auto scaling and endpoint placement continue with predictable address availability across the required Availability Zones. That result supports VPC subnet IP address exhaustion and growth but does not establish the requested networking outcome here. Instead verify: Only intended multicast group members receive application traffic under supported topology and security constraints. Scenario: A multicast group is created but receivers are not correctly registered or associated with the supporting Transit Gateway multicast domain.

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: Operations correlate network degradation with the right attachment or branch rather than acting on an isolated healthy metric. Scenario: Several branch offices lose access to AWS, but operators see healthy EC2 CPU metrics and assume the cloud service is operating end-to-end.

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: Operations correlate network degradation with the right attachment or branch rather than acting on an isolated healthy metric. Scenario: Several branch offices lose access to AWS, but operators see healthy EC2 CPU metrics and assume the cloud service is operating end-to-end.

Approved networks remain reachable through correct hybrid paths and BGP instability is detected before broad service impact. That result supports Direct Connect BGP neighbor monitoring and route changes but does not establish the requested networking outcome here. Instead verify: Operations correlate network degradation with the right attachment or branch rather than acting on an isolated healthy metric. Scenario: Several branch offices lose access to AWS, but operators see healthy EC2 CPU metrics and assume the cloud service is operating end-to-end.

Inspect route table associations, propagation flags, attachment states, longest-prefix matches, blackhole entries and VPC routes. These checks are primarily associated with Transit Gateway route changes and blackhole prevention; they are less discriminating for this case. The relevant checks are: Inspect BGP session history, neighbor state, advertised and learned prefixes, VIF status and change timeline. Scenario: A hybrid connection flaps every few minutes after a provider equipment change and the team watches only aggregate VPC bytes.

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 BGP session history, neighbor state, advertised and learned prefixes, VIF status and change timeline. Scenario: A hybrid connection flaps every few minutes after a provider equipment change and the team watches only aggregate VPC bytes.

Compare alarm periods, VPN tunnel states, branch link records, TGW route metrics, change history and measured client reachability. These checks are primarily associated with CloudWatch and Network Manager hybrid incident telemetry; they are less discriminating for this case. The relevant checks are: Inspect BGP session history, neighbor state, advertised and learned prefixes, VIF status and change timeline. Scenario: A hybrid connection flaps every few minutes after a provider equipment change and the team watches only aggregate VPC bytes.