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An AWS Site-to-Site VPN reports IPsec UP but BGP remains Down. The on-premises router's configured BGP neighbor inside address differs from the AWS tunnel configuration. Why are the private routes unavailable despite working encryption transport?
IPsec transport and BGP control-plane adjacency are separate; the incorrect neighbor address prevents the routing session.
An encrypted tunnel may be up while its BGP session remains down.
DNS selection is unrelated to BGP neighbor configuration.
Security groups do not rewrite router BGP peer configuration.
An inspection VPC uses Gateway Load Balancer behind a Transit Gateway. Outbound flows cross the firewall, but their return packets skip it and a stateful appliance drops later packets as out of state. Which routing change repairs the inspection path?
Stateful virtual firewall insertion requires flow symmetry; a separate return next hop bypasses its existing session state.
DNS scoping does not repair an asymmetrical packet path.
A healthy appliance cannot track a return flow it never receives.
Bypassing a stateful appliance for the remainder of a session violates the required symmetry.
A company has frequent subnet exhaustion as an autoscaling fleet grows. The VPC CIDR was originally undersized and new subnet allocations are fragmented across accounts. What planning measure addresses both scale and future overlap?
Governed CIDR pools and sufficient subnet space reduce failed ENI allocation and collisions across environments.
CPU availability does not create usable network addresses.
Overlapping expansion ranges defeat the network connectivity objective.
Suppressing telemetry cannot add address capacity.
A public JSON API experiences a burst of 30,000 HTTP requests in one minute from a small set of clients. The app team needs request-rate controls before requests reach its ALB targets. Which AWS security layer matches the attack pattern?
WAF evaluates application requests and can apply actions when configured request rates exceed the specified aggregation behavior.
Opening ports does not mitigate abusive HTTP request rates.
The targeted JSON API is served through an ALB, not directly by S3 object access.
Additional DNS answers do not enforce application-layer rate rules.
An application's VPC Flow Log shows action ACCEPT for a database connection, but the database server rejects the presented TLS client certificate. Which evidence explains the apparent contradiction?
A flow log ACCEPT does not prove that the higher-layer TLS handshake or database authentication completed.
Flow action does not report application authentication or transaction outcomes.
An ACCEPT classification does not itself mean a NACL blocked the packet.
Routing configuration cannot establish an application TLS certificate-validation outcome.
A research workload needs low-latency inter-node communication capabilities beyond ordinary TCP instance networking.
Which AWS networking configuration best addresses this specific requirement?
Elastic Fabric Adapter offers specialized OS-bypass networking for supported HPC workloads; it is not a generic internet-facing load balancer. The proposed change can be checked by whether the HPC network benchmark demonstrates the required inter-node latency and bandwidth with the selected EFA-enabled instances.
This configuration addresses nat gateway data-processing cost reduction, not the elastic fabric adapter hpc placement requirement. A gateway endpoint can route supported S3 traffic inside AWS without passing that traffic through a NAT gateway's per-GB processing path.
This configuration addresses global accelerator latency and failover optimization, not the elastic fabric adapter hpc placement requirement. Global Accelerator routes eligible TCP or UDP traffic onto the AWS global network and supports static anycast ingress and health-based endpoint routing.
This configuration addresses ipam and vpc cidr growth planning, not the elastic fabric adapter hpc placement requirement. VPC IPAM tracks allocations and overlap across organizational address pools, while usable subnet space still bounds ENI and pod growth.
A central CI/CD pipeline changes network routes in 20 workload accounts. It is forbidden to embed persistent access keys and should have only necessary EC2 networking permissions in each target account. How should the pipeline authenticate?
Temporary assumed-role credentials and trust policies limit access without distributing long-lived administrator keys.
Long-lived root credentials are overprivileged and violate the explicit authentication requirement.
DNS records do not grant AWS API authorization.
Broad instance privileges do not secure the central deployment identity.
A new Direct Connect private virtual interface has correct VLAN tagging, peer IPs and ASNs, and the physical link is up. The AWS-provided BGP MD5 authentication value was rotated, but the customer router still uses the old key; the BGP session remains Idle. What risk does declaring the link production-ready without matching authentication create?
Direct Connect BGP peers require matching authentication and neighbor settings before routes can be exchanged.
That introduces a new peer mismatch instead of fixing the old MD5 authentication value.
The VIF VLAN is aligned; the session fails authentication at BGP.
Prefix limits affect route exchange, but the current issue prevents session establishment.
A regional service reports intermittent failure and operators need to separate load balancer target errors from network transport faults.
Which AWS networking configuration best addresses this specific requirement?
Application Load Balancer HTTP error metrics and VPC flow metadata describe different layers; matching time windows localizes the likely origin. The proposed change can be checked by whether a test failure appears in the expected ALB and application metrics while network route and flow checks confirm or exclude packet-path faults.
This configuration addresses path mtu discovery black-hole diagnosis, not the cloudwatch network metric versus application log correlation requirement. Oversized packets may be discarded when encapsulation reduces effective MTU and Path MTU Discovery messages are blocked or misinterpreted.
This configuration addresses transit gateway network manager path diagnostics, not the cloudwatch network metric versus application log correlation requirement. Global network visibility tools present topology and routing evidence; they do not independently update all VPC, attachment or on-premises routes.
This configuration addresses flow log reject versus accept interpretation, not the cloudwatch network metric versus application log correlation requirement. VPC Flow Logs summarize observed network flows, and ACCEPT usually indicates network-level permission rather than successful application-layer processing.
Operations sees VPC Flow Logs ACCEPT for an application connection but users report incomplete TLS handshakes. Flow Logs alone cannot identify the missing application bytes. What diagnostic step should follow?
An ACCEPT record is not an application success record; higher-layer logs or packet analysis distinguish TLS failures from security-group denial.
Network acceptance cannot prove the application-layer handshake completed.
An unrelated public DNS trust chain is not evidence of the transport/application failure.
IP allocation capacity does not explain a TLS handshake error on an established flow.
An AWS CDK networking library is reused by dozens of application teams. Before publishing a new construct, the platform team must prove that synthesizing it never creates a world-open management security group. What is the appropriate preventative engineering step?
CDK constructs synthesize into CloudFormation; testing the generated network permissions catches reusable design defects before many stacks deploy them.
Postdeployment inspection does not provide the requested library-level prevention.
Code compilation cannot establish the security semantics of synthesized ingress rules.
DNS ownership records do not validate synthesized network policy.
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