Question 590
Traffic is entering the firewall AZ but returning through a different zone and sessions are dropped. Which AWS networking approach meets this constraint?
- Correct subnet routing to preserve symmetric AWS Network Firewall endpoint traversal
- Deploy AWS Network Firewall endpoints with routed firewall policy in the traffic path
- Define centralized AWS Network Firewall policies and rule-group lifecycle controls
- Enable AWS Network Firewall alert and flow logging to a suitable destination
Explanation
Correct Answer
A:The approach keeps both directions of the flow through the stateful inspection path; rules cannot track a return flow they never observe, directly enabling stateful firewall session continuity in this situation.
Incorrect Answers
B:This alternative applies managed stateless and stateful inspection to forwarded network packets; a deployed firewall without route redirection is bypassed by ordinary traffic, so it addresses centrally enforced traffic inspection rather than the required stateful firewall session continuity.
C:Although this setting makes a consistent set of stateless and stateful rules deployable to multiple firewalls, copying independent manual rule edits promotes configuration drift; this concerns consistent managed network inspection policy, not the specified stateful firewall session continuity.
D:The proposed action records firewall match and flow observations for investigation; ordinary VPC flow records lack the full inspection-rule match context, supporting explainable stateful policy decisions but leaving stateful firewall session continuity unmet.
Question 591
A single forensic EC2 instance requires detailed flow records without generating logs for the entire network. Which action directly resolves the stated problem?
- Inspect the ACCEPT and REJECT actions in VPC Flow Log records
- Deliver VPC Flow Logs to Amazon S3 in a suitable format
- Enable VPC Flow Logs at the VPC scope
- Enable a VPC Flow Log on the specific elastic network interface
Explanation
Correct Answer
D:This configuration scopes IP-flow metadata collection to one ENI; capturing VPC-wide traffic would include many unrelated interfaces, so it delivers targeted interface-level network investigation under the stated constraints.
Incorrect Answers
A:The proposed action identifies whether captured network flows were allowed or denied by network controls; flow logs do not reveal application payload content or every packet-level failure cause, supporting reachability evidence at flow-record granularity but leaving targeted interface-level network investigation unmet.
B:This approach stores flow-log records in an object store suitable for later analysis; CloudWatch alarms can analyze metrics but are not an object-archive delivery substitute, which helps with durable searchable flow records in S3 instead of delivering targeted interface-level network investigation.
C:This alternative records selected flow metadata for supported network interfaces across the VPC; a subnet-only log would miss interfaces outside the chosen subnet, so it addresses broad IP-flow visibility over changing workloads rather than the required targeted interface-level network investigation.
Question 592
The network team will deploy centrally defined logging stacks across an AWS Organization and must assume scoped roles during cross-account execution. Which capabilities fit this deployment model? Choose TWO.
- Use CloudFormation StackSets with organizational deployment targets
- Narrow its IAM permissions and resource conditions where supported
- Include an AWS RAM resource-share step with authorized principals
- Apply appropriate stack termination protection and resource deletion policies
- Assume scoped cross-account IAM roles using STS during deployment
Explanation
Correct Answers
A:This component deploys a consistent stack across selected accounts and Regions; an individual stack exists in one account and Region instead of the whole target fleet, contributing centrally distributed network logging baseline to the combined requirement for controlled multi-account IaC execution and centrally distributed network logging baseline.
E:This component grants temporary least-privilege credentials in the destination account; embedding access keys into pipeline code creates an avoidable secret-management risk, contributing controlled multi-account IaC execution to the combined requirement for controlled multi-account IaC execution and centrally distributed network logging baseline.
Incorrect Answers
B:The proposed action limits API changes to the resources and operations required by the function; broad wildcard permissions increase the impact of bugs or compromised automation, supporting least-privilege network remediation automation but leaving controlled multi-account IaC execution and centrally distributed network logging baseline unmet.
C:This approach publishes the owned gateway to the consuming accounts; gateway creation alone does not grant external accounts attachment rights, which helps with reproducible cross-account transit gateway sharing instead of delivering controlled multi-account IaC execution and centrally distributed network logging baseline.
D:This alternative guards selected deployed networking infrastructure from unintended teardown; IAM alone may not express the desired per-resource retention behavior during stack updates, so it addresses protected lifecycle of critical network resources rather than the required controlled multi-account IaC execution and centrally distributed network logging baseline.
Question 593
A private service endpoint lacks an internet-routable IP, so a standard Route 53 health checker cannot reach it. How should this network requirement be implemented?
- Configure Route 53 multivalue answer routing with per-record health checks
- Publish a CloudWatch-alarm-based Route 53 health check driven by private endpoint metrics
- Configure an HTTPS Route 53 health check with a string match
- Enable evaluate target health on the Route 53 alias where supported
Explanation
Correct Answer
B:With this choice, the selected action uses an alarm state as health evidence instead of internet probes; directly probing an RFC1918-only target from public health checkers will not work, providing health-aware DNS failover for private targets for the network described.
Incorrect Answers
A:This approach returns multiple healthy DNS answers rather than one selected target; the client still selects and contacts an address without an intermediary proxy, which helps with health-aware distribution of several IP addresses instead of delivering health-aware DNS failover for private targets.
C:Although this setting probes HTTP response content over TLS to classify endpoint health, TCP checks can succeed even when a wrong web page is served; this concerns application-content-aware DNS health evaluation, not the specified health-aware DNS failover for private targets.
D:The proposed action uses the health of the referenced AWS resource in relevant routing decisions; an ordinary TCP probe to a single instance would not express ALB target-group health, supporting load-balancer-aware Route 53 routing but leaving health-aware DNS failover for private targets unmet.
Question 594
A member account receives access to an AWS RAM-shared Transit Gateway and creates its own VPC attachment. Its engineer cannot edit the Transit Gateway route tables or route propagation settings. Who must make the requested transit routing changes?
- Grant the participant access to its own VPC Flow Logs and retry the route-table modification
- Publish an IAM policy in the participant account that grants every transit gateway route-table API
- The Transit Gateway owner must manage route-table associations, propagations, and static routes for the shared gateway
- Create a Route 53 private hosted zone associated with the participant VPC
Explanation
Correct Answer
C:Sharing a transit gateway permits participants to create and inspect supported VPC attachments but does not delegate ownership of the gateway routing control plane. The owner remains responsible for configuring the tables and propagation relationships.
Incorrect Answers
A:Flow Logs permissions affect telemetry for supported VPC resources, not administrative ownership of the shared transit gateway. They cannot override the route-table boundary.
B:A policy in the participant account cannot create ownership rights that the shared resource model does not grant. The gateway owner's account must perform those route operations.
D:Private hosted zones provide DNS answers, not administrative authorization to edit another account's transit gateway routing tables. The management boundary remains unchanged.
Question 595
A distribution needs to fetch an authentication token from another service during an origin-facing transformation. Which change is the most appropriate?
- Create path-pattern cache behaviors with dedicated origin assignments
- Configure CloudFront Origin Access Control and restrict the bucket policy accordingly
- Use Lambda@Edge for the supported CloudFront trigger
- Attach a CloudFront Function to the appropriate viewer event
Explanation
Correct Answer
C:With this choice, the selected action runs richer request or response logic at regional edge locations with supported network operations; supported events and runtime restrictions must be checked before selecting the integration, providing edge logic requiring capabilities beyond CloudFront Functions for the network described.
Incorrect Answers
A:Although this setting matches requests to ordered cache behaviors and sends them to their selected origins, behavior ordering matters when path patterns overlap; this concerns routing CDN paths to separate application backends, not the specified edge logic requiring capabilities beyond CloudFront Functions.
B:The proposed action signs requests from CloudFront to the S3 origin under a scoped resource policy; blocking all public bucket access remains compatible with approved distribution-origin requests, supporting private S3 origin access through CloudFront but leaving edge logic requiring capabilities beyond CloudFront Functions unmet.
D:This alternative runs lightweight JavaScript logic at CloudFront edge locations for supported viewer events; the function cannot make network requests or perform heavyweight origin-facing operations, so it addresses inexpensive edge URI normalization rather than the required edge logic requiring capabilities beyond CloudFront Functions.
Question 596
A network operator needs to carry traffic with an additional overlay protocol header but encryption is not demanded. How should this network requirement be implemented?
- Use Generic Routing Encapsulation between compatible network devices
- Peer the virtual routers with Transit Gateway Connect using BGP
- Encapsulate branch traffic in IPsec VPN tunnels
- Use Transit Gateway Connect and Connect peers
- Design distinct tenant overlay routing and transit route-table segmentation
Explanation
Correct Answer
A:This configuration wraps IP traffic inside GRE for overlay forwarding; IPsec provides cryptographic protections but is not the same as a plain GRE transport, so it delivers protocol encapsulation for an overlay tunnel under the stated constraints.
Incorrect Answers
B:Although this setting allows the appliance to advertise and learn supported network routes over GRE peers, an ALB does not exchange overlay routing control-plane updates; this concerns routed integration of SD-WAN appliances, not the specified protocol encapsulation for an overlay tunnel.
C:The proposed action adds IP-layer encryption and peer authentication across the intervening network; GRE alone provides encapsulation without confidentiality, supporting encrypted overlay communications but leaving protocol encapsulation for an overlay tunnel unmet.
D:This approach transports GRE overlay traffic and exchanges routes over BGP with compatible appliances; a simple VPC attachment alone does not establish GRE Connect peers, which helps with native transit attachment for SD-WAN overlays instead of delivering protocol encapsulation for an overlay tunnel.
E:This alternative separates policy and reachability over otherwise shared transport infrastructure; merely adding another VLAN ID does not enforce every inter-VPC route boundary, so it addresses tenant-isolated SD-WAN connectivity rather than the required protocol encapsulation for an overlay tunnel.
Question 597
A public zone's DNSSEC signing was enabled, but a domain registry still lacks its DS record. What is the most suitable design or configuration?
- Associate a Resolver query log configuration with that VPC
- Add the child's DS information to the parent delegation
- Add a default record for the geolocation record set
- Configure a Route 53 health check with content matching and failover routing
Explanation
Correct Answer
B:The approach establishes the missing DNSSEC parent-child trust link; KMS signing configuration alone does not prove authenticity to a recursive validator, directly enabling end-to-end DNSSEC validator trust in this situation.
Incorrect Answers
A:This approach records supported VPC resolver queries for subsequent analysis; Route 53 public hosted-zone logs only show authoritative DNS queries that reach that zone, which helps with VPC-originated DNS query audit records instead of delivering end-to-end DNSSEC validator trust.
C:Although this setting supplies an answer for unmatched geographic source queries, unmatched locations can otherwise have no suitable geolocation record answer; this concerns reliable geo-based DNS response completion, not the specified end-to-end DNSSEC validator trust.
D:The proposed action uses observed application health to decide whether primary DNS responses should be served; ordinary weighted routing is not inherently primary-secondary failover, supporting endpoint-aware authoritative DNS failover but leaving end-to-end DNSSEC validator trust unmet.
Question 598
A company provisions identical network hub patterns in six accounts and wants reviewed, repeatable deployments. Which AWS networking approach meets this constraint?
- Build reusable AWS CDK constructs with context-specific parameters
- Publish versioned infrastructure modules with controlled inputs and outputs
- Define reusable AWS CloudFormation networking templates and parameters
- Review a CloudFormation change set before execution
Explanation
Correct Answer
C:With this choice, the selected action deploys VPC, subnet, routing and related resources as declarative stacks; console-only manual changes increase configuration drift and inconsistency, providing reproducible multi-account network construction for the network described.
Incorrect Answers
A:The proposed action synthesizes infrastructure definitions from code for consistent deployments; hardcoded account-specific IDs weaken portability, supporting programmatic reuse of network infrastructure components but leaving reproducible multi-account network construction unmet.
B:This approach establishes a repeatable shared contract for network composition; duplication of unversioned snippets makes later policy corrections inconsistent, which helps with governance of reusable IaC network resources instead of delivering reproducible multi-account network construction.
D:Although this setting previews planned stack mutations and replacement behavior, an immediate update hides the proposed resource transition until it is underway; this concerns controlled network infrastructure change review, not the specified reproducible multi-account network construction.
Question 599
A public web application needs to filter SQL injection signatures and throttle abusive clients that send too many HTTP requests. Which AWS WAF mechanisms address the two attack patterns? Choose TWO.
- Use a CloudFront-scope WAF web ACL for the distribution
- Build WAF rules with header and URI matching conditions
- Configure a WAF rate-based rule with the intended aggregation keys
- Attach an AWS WAF web ACL with appropriate managed or custom rules
- Set the rule action to Count during evaluation and review metrics or logs
Explanation
Correct Answers
C:This component counts matching requests and applies an action after configured rates are exceeded; Route 53 health checks do not throttle abusive HTTP callers, contributing managed per-client web request-rate mitigation to the combined requirement for application-layer filtering of malicious web requests and managed per-client web request-rate mitigation.
D:This component evaluates supported HTTP request components before forwarding to protected resources; a subnet NACL cannot parse HTTP payload signatures, contributing application-layer filtering of malicious web requests to the combined requirement for application-layer filtering of malicious web requests and managed per-client web request-rate mitigation.
Incorrect Answers
A:Although this setting applies WAF inspection at the global CDN integration scope, a regional web ACL attached to an ALB does not automatically protect every CloudFront viewer request; this concerns security policy for the distribution edge, not the specified application-layer filtering of malicious web requests and managed per-client web request-rate mitigation.
B:The proposed action inspects layer-seven request attributes before the origin receives traffic; security groups operate on network addresses and transport ports instead, supporting fine-grained application HTTP request filtering but leaving application-layer filtering of malicious web requests and managed per-client web request-rate mitigation unmet.
E:Although this setting records matches without applying the blocking decision, immediately blocking every match can interrupt legitimate application traffic; this concerns safe observation of candidate WAF rule impact, not the specified application-layer filtering of malicious web requests and managed per-client web request-rate mitigation.
Question 600
A performance team needs to distinguish changing CloudFront cache effectiveness from upstream origin server latency. Which solution best addresses these network requirements?
- Monitor Site-to-Site VPN TunnelState and related metrics
- Capture time-series CloudWatch metrics and scheduled active network measurements
- Enable AWS Network Firewall logging and supported monitoring metrics
- Track CloudFront cache hit metrics with origin-response performance indicators
Explanation
Correct Answer
D:With this choice, the selected action separates edge cache behavior from origin fetch effects; a single application CPU chart cannot identify CDN cache-miss patterns, providing causal visibility into CDN performance for the network described.
Incorrect Answers
A:This alternative reports AWS-side tunnel condition over time for alerting; an ELB target-health metric tracks application targets rather than IPsec tunnels, so it addresses evidence of VPN tunnel reliability rather than the required causal visibility into CDN performance.
B:Although this setting establishes normal performance ranges for later regression comparisons, a one-time route-table export does not measure time-varying network behavior; this concerns baseline throughput and latency during healthy operations, not the specified causal visibility into CDN performance.
C:The proposed action emits traffic inspection and alert information from firewall processing; VPC Flow Logs cannot expose the complete rule context of a stateful firewall, supporting visibility into inspected flow decisions but leaving causal visibility into CDN performance unmet.