Application-layer URL controls must be enforced where the HTTP request is inspected explains a different case, for example when a regional edge application needs a custom allowlist for administrative URLs but the rule is attached only to an internal firewall. In the current topology, the deciding factor is that network segmentation depends on both routing reachability and resource access controls; this choice therefore does not explain the specified remedy.

Egress inspection applies filtering only to traffic intentionally routed through the control explains a different case, for example when an organization needs central domain and IP reputation filtering for outbound workloads in many AWS accounts. In the current topology, the deciding factor is that network segmentation depends on both routing reachability and resource access controls; this choice therefore does not explain the specified remedy.

NACLs evaluate numbered stateless subnet rules and require explicit response-direction allowances explains a different case, for example when a private subnet must reject a prohibited IP address at its boundary even when security groups allow other application traffic. In the current topology, the deciding factor is that network segmentation depends on both routing reachability and resource access controls; this choice therefore does not explain the specified remedy.

Independent recursive lookups reach the active Route 53 authoritative name servers might confirm another remediation, for instance when a public delegated subdomain has been created in Route 53 but the registrar still delegates only to the old name servers. This question instead requires demonstrating that queries from member VPCs reach the designated corporate DNS servers. The alternative would not validate the selected network fix.

On-premises queries arrive on the endpoint and resolve intended private AWS names might confirm another remediation, for instance when an on-premises DNS appliance forwards internal AWS names to a VPC but has no routable destination for the VPC Resolver endpoint IPs. This question instead requires demonstrating that queries from member VPCs reach the designated corporate DNS servers. The alternative would not validate the selected network fix.

The same test query is attributed to the expected VPC and stored with required retention might confirm another remediation, for instance when an enterprise must trace which VPC originated suspicious DNS lookups without full packet capture. This question instead requires demonstrating that queries from member VPCs reach the designated corporate DNS servers. The alternative would not validate the selected network fix.

Treating a REJECT record as proof of one particular NACL entry can misdirect fixes can be a real consequence when a flow log shows REJECT for a source and destination but a technician cannot tell which specific ACL caused it. Here the relevant failure is that scaling origin CPU may not repair an inefficient global network entry path. The alternative names a different failure mode and does not best account for the stated condition.

A green EC2 status check does not prove a target group's application probe passes can be a real consequence when an NLB target is unhealthy while TCP traffic is delivered to a different instance by a manually configured DNS override. Here the relevant failure is that scaling origin CPU may not repair an inefficient global network entry path. The alternative names a different failure mode and does not best account for the stated condition.

A smooth long-window graph does not prove the absence of brief saturation can be a real consequence when a company is investigating short bursts of traffic that disappear from five-minute aggregated metrics. Here the relevant failure is that scaling origin CPU may not repair an inefficient global network entry path. The alternative names a different failure mode and does not best account for the stated condition.

EFA offers specialized low-latency networking for eligible HPC workloads explains a different case, for example when an HPC application needs low-latency communication among tightly coupled EC2 nodes. In the current topology, the deciding factor is that appropriate connectivity patterns balance operational simplicity against transit processing charges; this choice therefore does not explain the specified remedy.

EC2 network throughput ceilings vary by instance family and workload pattern explains a different case, for example when a batch data service saturates one EC2 network path because instances were placed on incompatible network tiers. In the current topology, the deciding factor is that appropriate connectivity patterns balance operational simplicity against transit processing charges; this choice therefore does not explain the specified remedy.

Global Accelerator can route supported traffic over AWS global network from an anycast entry point explains a different case, for example when a global HTTP API has regional users with highly variable internet route quality and cannot tolerate long path detours. In the current topology, the deciding factor is that appropriate connectivity patterns balance operational simplicity against transit processing charges; this choice therefore does not explain the specified remedy.

EC2 network throughput ceilings vary by instance family and workload pattern explains a different case, for example when a batch data service saturates one EC2 network path because instances were placed on incompatible network tiers. In the current topology, the deciding factor is that subnet free IP capacity constrains launches and network interface assignment; this choice therefore does not explain the specified remedy.

Global Accelerator can route supported traffic over AWS global network from an anycast entry point explains a different case, for example when a global HTTP API has regional users with highly variable internet route quality and cannot tolerate long path detours. In the current topology, the deciding factor is that subnet free IP capacity constrains launches and network interface assignment; this choice therefore does not explain the specified remedy.

Load balancer routing options can alter zonal distribution and cost characteristics explains a different case, for example when an application gets uneven cross-zone target usage after load balancer cross-zone settings were changed. In the current topology, the deciding factor is that subnet free IP capacity constrains launches and network interface assignment; this choice therefore does not explain the specified remedy.

One-way successful SYN delivery cannot establish a bidirectional TCP connection can be a real consequence when a VPC peering change broke one direction of a database connection but the forward route is present. Here the relevant failure is that an unintended more-specific route can divert only one application subnet. The alternative names a different failure mode and does not best account for the stated condition.

A physical circuit showing Up cannot fix a missing route advertisement can be a real consequence when an on-premises application loses access to a VPC after a BGP policy change on the customer Direct Connect router. Here the relevant failure is that an unintended more-specific route can divert only one application subnet. The alternative names a different failure mode and does not best account for the stated condition.

Recreating the provider ALB does not approve a rejected consumer endpoint can be a real consequence when a service needs a private cross-account endpoint but a deployment removed its consumer endpoint acceptance. Here the relevant failure is that an unintended more-specific route can divert only one application subnet. The alternative names a different failure mode and does not best account for the stated condition.

Use CloudFront cache behaviors with suitable TTL and origin request policies would address a different scenario, such as when a global video publisher has high origin load because viewers repeatedly request the same public media files. The present issue requires define CloudFront cache policies that vary only on required headers and query strings because the network path and control point are different; the alternative does not directly meet this requirement.

Select Global Accelerator supported UDP listeners and health-checked regional endpoints would address a different scenario, such as when a multiplayer client cannot tolerate DNS change delays during regional failure and uses UDP transport. The present issue requires define CloudFront cache policies that vary only on required headers and query strings because the network path and control point are different; the alternative does not directly meet this requirement.

Use a CloudFront distribution with appropriate viewer certificate and origins would address a different scenario, such as when a website requires viewers in distant locations to reach the nearest available HTTP edge with HTTPS termination. The present issue requires define CloudFront cache policies that vary only on required headers and query strings because the network path and control point are different; the alternative does not directly meet this requirement.

A normal HTTP ALB is not a drop-in transparent inspection hop for arbitrary IP packets can be a real consequence when a fleet of virtual firewalls must receive traffic with flow symmetry and transparent appliance insertion. Here the relevant failure is that full VPC peering adds broader address reachability than the single-service requirement. The alternative names a different failure mode and does not best account for the stated condition.

Incorrect health checks can cause all service targets to be declared unhealthy can be a real consequence when a batch service runs healthy processes but fails ALB health checks because the probe path requires a user login. Here the relevant failure is that full VPC peering adds broader address reachability than the single-service requirement. The alternative names a different failure mode and does not best account for the stated condition.

Increasing instance CPU cannot fix a shorter intermediary idle timeout can be a real consequence when a long-running upload behind an ALB is cut off after idle periods although the target process stays alive. Here the relevant failure is that full VPC peering adds broader address reachability than the single-service requirement. The alternative names a different failure mode and does not best account for the stated condition.

Tunnel status indicates control connectivity but may conceal application-plane impairment explains a different case, for example when an application sees packet loss after changing a VPN's customer equipment but AWS tunnel metrics show Up. In the current topology, the deciding factor is that an accepted network flow record does not guarantee a successful application response; this choice therefore does not explain the specified remedy.

Similar AWS attachments do not imply identical on-premises policy or address translation explains a different case, for example when a SaaS service works from one branch but fails from another while both share central AWS Transit Gateway connectivity. In the current topology, the deciding factor is that an accepted network flow record does not guarantee a successful application response; this choice therefore does not explain the specified remedy.

Packet mirroring captures selected packet-level details missing from summary flow records explains a different case, for example when an investigation requires knowing whether an EC2 guest received a malformed packet that flow records cannot describe. In the current topology, the deciding factor is that an accepted network flow record does not guarantee a successful application response; this choice therefore does not explain the specified remedy.

Operating only one tunnel sacrifices built-in redundancy during endpoint maintenance can be a real consequence when a company needs a redundant Site-to-Site VPN and both standard tunnels terminate on customer gateway devices. Here the relevant failure is that relying on dual tunnel count alone leaves one on-premises failure domain. The alternative names a different failure mode and does not best account for the stated condition.

An accelerated VPN endpoint does not remove all customer last-mile and tunnel constraints can be a real consequence when a remote office experiences internet variability to the selected AWS VPN region and wants improved entry routing. Here the relevant failure is that relying on dual tunnel count alone leaves one on-premises failure domain. The alternative names a different failure mode and does not best account for the stated condition.

A generic Site-to-Site VPN connection does not provide the same managed GRE Connect pattern can be a real consequence when a distributed branch solution needs SD-WAN appliance integration with Transit Gateway using overlay tunnels. Here the relevant failure is that relying on dual tunnel count alone leaves one on-premises failure domain. The alternative names a different failure mode and does not best account for the stated condition.

Shared edge caches require cache keys and response policies that respect authorization context explains a different case, for example when an application serves large personalized private documents and must prevent one user's cached response reaching another. In the current topology, the deciding factor is that cache TTL and origin caching directives govern object freshness and repeat fetches; this choice therefore does not explain the specified remedy.

Cache-key selection trades content correctness against fragmentation and cache efficiency explains a different case, for example when a news publisher wants different images cached by device class but never by irrelevant tracking parameters. In the current topology, the deciding factor is that cache TTL and origin caching directives govern object freshness and repeat fetches; this choice therefore does not explain the specified remedy.

Content delivery edges shorten the viewer-to-edge leg and offload TLS processing explains a different case, for example when a website requires viewers in distant locations to reach the nearest available HTTP edge with HTTPS termination. In the current topology, the deciding factor is that cache TTL and origin caching directives govern object freshness and repeat fetches; this choice therefore does not explain the specified remedy.