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AWS Certified DevOps Engineer - Professional DOP-C02 Practice Test 48

Question 470

An administrator modifies a mandatory Control Tower resource in a governed account and automation later reports the landing zone out of compliance.

Which adverse outcome is the recommended change intended to prevent?

  1. Unresolved landing-zone drift can disable central detective controls and undermine the account compliance assumption.
  2. Missing member-account audit events prevent investigators from reconstructing resource changes after a security incident.
  3. Relying on one account's local Config dashboard hides violations that exist only in other accounts or Regions.
  4. Manual per-account provisioning leaves newly added workloads without mandatory baseline governance controls.

Explanation

Correct Answer

A:

Unresolved landing-zone drift can disable central detective controls and undermine the account compliance assumption. This outcome arises from the mechanism in the situation: Control Tower governance depends on baseline resources remaining in their managed expected state; manual alterations can compromise control operation. The corresponding mitigation is: Investigate Control Tower drift and restore the prescribed landing-zone resources through supported repair or re-enrollment processes.

Incorrect Answers

B:

Missing member-account audit events prevent investigators from reconstructing resource changes after a security incident. That is a credible concern for organization trail audit scope, normally addressed by: Create an organization-level multi-Region CloudTrail trail with protected centralized log storage and appropriate ownership. It is not the primary failure mechanism described here. The relevant exposure is: Unresolved landing-zone drift can disable central detective controls and undermine the account compliance assumption.

C:

Relying on one account's local Config dashboard hides violations that exist only in other accounts or Regions. That is a credible concern for multiaccount config aggregation, normally addressed by: Configure an AWS Config aggregator with the required organization and Region coverage and centrally review aggregated compliance. It is not the primary failure mechanism described here. The relevant exposure is: Unresolved landing-zone drift can disable central detective controls and undermine the account compliance assumption.

D:

Manual per-account provisioning leaves newly added workloads without mandatory baseline governance controls. That is a credible concern for stacksets ou deployment, normally addressed by: Use service-managed CloudFormation StackSets with AWS Organizations targeting and automatic OU deployment where appropriate. It is not the primary failure mechanism described here. The relevant exposure is: Unresolved landing-zone drift can disable central detective controls and undermine the account compliance assumption.

Question 471

A public ALB HTTPS listener presents an expired certificate because teams manually renew and upload PEM files for each deployment.

What should operators verify before closing the issue?

  1. A seeded test object containing protected identifiers generates a finding and its owning team receives an appropriate remediation task.
  2. A renewal exercise or certificate-status check confirms the ALB presents a valid trusted certificate before expiry.
  3. Only the approved pipeline role can decrypt test artifacts while denied roles cannot call the needed KMS operations.
  4. A packet capture shows encrypted application payloads and invalid server certificates are rejected by the client.

Explanation

Correct Answer

B:

A renewal exercise or certificate-status check confirms the ALB presents a valid trusted certificate before expiry. It directly verifies the change: Use an eligible AWS Certificate Manager managed certificate and validate DNS ownership and listener association. The test matters because aCM can automate supported public certificate renewals when domain validation and service integration remain valid.

Incorrect Answers

A:

A seeded test object containing protected identifiers generates a finding and its owning team receives an appropriate remediation task. That result would help prove macie sensitive data discovery, where the relevant action is: Use Amazon Macie sensitive-data discovery jobs with appropriate scope and permissions and investigate findings. It does not establish this case's required outcome. For acm certificate lifecycle, the decisive verification is: A renewal exercise or certificate-status check confirms the ALB presents a valid trusted certificate before expiry.

C:

Only the approved pipeline role can decrypt test artifacts while denied roles cannot call the needed KMS operations. That result would help prove kms key least privilege, where the relevant action is: Grant KMS use only to authorized artifact and deployment roles with appropriate key policy and identity permissions. It does not establish this case's required outcome. For acm certificate lifecycle, the decisive verification is: A renewal exercise or certificate-status check confirms the ALB presents a valid trusted certificate before expiry.

D:

A packet capture shows encrypted application payloads and invalid server certificates are rejected by the client. That result would help prove data transport encryption, where the relevant action is: Require TLS for sensitive service connections with validated server identity and protected certificate/key management. It does not establish this case's required outcome. For acm certificate lifecycle, the decisive verification is: A renewal exercise or certificate-status check confirms the ALB presents a valid trusted certificate before expiry.

Question 472

An EC2 API fleet has predictable CPU-bound work but fixed capacity causes long requests during peak hours and waste at night.

Which validation result offers the strongest acceptance evidence?

  1. Increasing desired tasks causes suitable container instances to join and pending tasks enter RUNNING when capacity appears.
  2. A repeatable load test increases and decreases in-service instances while latency and instance health remain acceptable.
  3. Load testing shows database connection counts stay below approved thresholds while the SQS backlog drains at a controlled rate.
  4. Variable traffic completes within approved latency and throttling limits with costs reviewed against usage expectations.

Explanation

Correct Answer

B:

A repeatable load test increases and decreases in-service instances while latency and instance health remain acceptable. It directly verifies the change: Set an Auto Scaling target-tracking policy on an appropriate utilization metric and maintain sensible minimum and maximum capacity. The test matters because target tracking adjusts capacity to keep a scalable workload metric near the desired threshold while respecting capacity boundaries.

Incorrect Answers

A:

Increasing desired tasks causes suitable container instances to join and pending tasks enter RUNNING when capacity appears. That result would help prove ecs capacity providers, where the relevant action is: Configure an ECS capacity provider strategy with managed scaling for the underlying cluster where appropriate. It does not establish this case's required outcome. For target tracking cpu scaling, the decisive verification is: A repeatable load test increases and decreases in-service instances while latency and instance health remain acceptable.

C:

Load testing shows database connection counts stay below approved thresholds while the SQS backlog drains at a controlled rate. That result would help prove lambda concurrency protection, where the relevant action is: Set an appropriate maximum event-source concurrency or reserved concurrency and coordinate queue retries with database capacity. It does not establish this case's required outcome. For target tracking cpu scaling, the decisive verification is: A repeatable load test increases and decreases in-service instances while latency and instance health remain acceptable.

D:

Variable traffic completes within approved latency and throttling limits with costs reviewed against usage expectations. That result would help prove dynamodb on demand capacity, where the relevant action is: Select appropriate on-demand capacity or autoscaled provisioned throughput and monitor throttling and cost boundaries. It does not establish this case's required outcome. For target tracking cpu scaling, the decisive verification is: A repeatable load test increases and decreases in-service instances while latency and instance health remain acceptable.

Question 473

A fleet emits JSON application logs, but responders download every log stream individually to find the error path common to a major outage.

What result would most credibly prove that the control is effective?

  1. The security-group change is traceable to an API event with actor role, source context and timestamp.
  2. A time-bounded query returns the failing request IDs, exception counts and affected services from multiple streams.
  3. The affected running workload and image version are identified and a fixed image is confirmed on the vulnerable service.
  4. A representative slow request trace highlights the dependent segment responsible for most of the end-to-end latency.

Explanation

Correct Answer

B:

A time-bounded query returns the failing request IDs, exception counts and affected services from multiple streams. It directly verifies the change: Use CloudWatch Logs Insights queries to aggregate and filter relevant log fields across selected log groups and time ranges. The test matters because logs Insights supports interactive server-side queries that correlate large log sets without manual stream-by-stream exports.

Incorrect Answers

A:

The security-group change is traceable to an API event with actor role, source context and timestamp. That result would help prove cloudtrail management audit, where the relevant action is: Search CloudTrail management events with time, account, event name and user identity, preserving an appropriate audit trail. It does not establish this case's required outcome. For cloudwatch logs insights, the decisive verification is: A time-bounded query returns the failing request IDs, exception counts and affected services from multiple streams.

C:

The affected running workload and image version are identified and a fixed image is confirmed on the vulnerable service. That result would help prove inspector vulnerability context, where the relevant action is: Review Amazon Inspector findings with severity, affected resource and exposure context, linking results to deployed artifact versions. It does not establish this case's required outcome. For cloudwatch logs insights, the decisive verification is: A time-bounded query returns the failing request IDs, exception counts and affected services from multiple streams.

D:

A representative slow request trace highlights the dependent segment responsible for most of the end-to-end latency. That result would help prove x ray trace latency, where the relevant action is: Instrument supported request paths for AWS X-Ray traces and inspect segments to isolate high-latency dependencies. It does not establish this case's required outcome. For cloudwatch logs insights, the decisive verification is: A time-bounded query returns the failing request IDs, exception counts and affected services from multiple streams.

Question 474

A production security event requires enrichment, ticket creation, controlled approval and optional isolation, but Lambda handlers perform these steps with fragile nested callbacks.

Which technical interpretation is the strongest for this case?

  1. A state machine makes multistep event response visible and handles human or service dependencies more reliably than one opaque handler.
  2. Archived events can be replayed later, but downstream actions must tolerate repeated event delivery and original event timestamps.
  3. Dead-letter queues isolate repeatedly failing messages, allowing a controlled diagnostic path without losing the original payload.
  4. SNS fanout distributes one notification to multiple subscribed destinations without requiring the producing system to address each recipient separately.

Explanation

Correct Answer

A:

A state machine makes multistep event response visible and handles human or service dependencies more reliably than one opaque handler. This explains the implementation decision: Use a Step Functions workflow with explicit branches, task-level retries and approval-dependent transitions. Verification should show the following: A test event produces the correct enriched ticket and cannot reach the isolation step without its required authorization.

Incorrect Answers

B:

Archived events can be replayed later, but downstream actions must tolerate repeated event delivery and original event timestamps. This reasoning supports the alternative topic of eventbridge archive replay, for which the relevant intervention is: Use an EventBridge archive and replay strategy on the intended event bus with idempotent processing and scope controls. The scenario requires understanding step functions incident orchestration, where a state machine makes multistep event response visible and handles human or service dependencies more reliably than one opaque handler.

C:

Dead-letter queues isolate repeatedly failing messages, allowing a controlled diagnostic path without losing the original payload. This reasoning supports the alternative topic of sqs dead letter handling, for which the relevant intervention is: Configure an appropriate SQS redrive policy to a dead-letter queue and investigate messages that exceed the retry threshold. The scenario requires understanding step functions incident orchestration, where a state machine makes multistep event response visible and handles human or service dependencies more reliably than one opaque handler.

D:

SNS fanout distributes one notification to multiple subscribed destinations without requiring the producing system to address each recipient separately. This reasoning supports the alternative topic of sns fanout to teams, for which the relevant intervention is: Publish one structured incident event to an SNS topic with appropriate independent subscriptions or downstream queue consumers. The scenario requires understanding step functions incident orchestration, where a state machine makes multistep event response visible and handles human or service dependencies more reliably than one opaque handler.

Question 475

An EC2 fleet must receive a risky application revision with rapid rollback and no in-place package mutation of healthy instances.

What risk best explains the need for a different approach?

  1. Treating a running container as ready can create gaps in service capacity during an otherwise successful rollout.
  2. Missing lifecycle steps can make a pipeline report file transfer success while the running application remains on the old version.
  3. Premature cutover sends live requests to bootstrapping instances that cannot yet process transactions.
  4. An in-place all-host update can leave no known-good instances available when a common defect causes widespread failure.

Explanation

Correct Answer

D:

An in-place all-host update can leave no known-good instances available when a common defect causes widespread failure. This outcome arises from the mechanism in the situation: A separate target fleet keeps the last-known-good servers available until the replacement version meets cutover criteria. The corresponding mitigation is: Deploy the revision to a separate green EC2 fleet and switch traffic after health checks using a blue/green deployment strategy.

Incorrect Answers

A:

Treating a running container as ready can create gaps in service capacity during an otherwise successful rollout. That is a credible concern for kubernetes rolling readiness, normally addressed by: Use readiness probes and rolling-update maxUnavailable/maxSurge settings that preserve service capacity during replacement. It is not the primary failure mechanism described here. The relevant exposure is: An in-place all-host update can leave no known-good instances available when a common defect causes widespread failure.

B:

Missing lifecycle steps can make a pipeline report file transfer success while the running application remains on the old version. That is a credible concern for codedeploy lifecycle hooks, normally addressed by: Configure the appropriate AppSpec lifecycle hooks to stop, install and start the application, then validate the service after installation. It is not the primary failure mechanism described here. The relevant exposure is: An in-place all-host update can leave no known-good instances available when a common defect causes widespread failure.

C:

Premature cutover sends live requests to bootstrapping instances that cannot yet process transactions. That is a credible concern for alb target group health, normally addressed by: Require healthy load-balancer target status and suitable readiness checks before shifting client traffic to replacement capacity. It is not the primary failure mechanism described here. The relevant exposure is: An in-place all-host update can leave no known-good instances available when a common defect causes widespread failure.

Question 476

A feature flag changes critical checkout logic and developers currently overwrite a JSON configuration on all production instances at once.

What is the best automation decision for this workload?

  1. Deploy validated configuration through AWS AppConfig with a gradual deployment strategy and CloudWatch alarm rollback.
  2. Use EventBridge Scheduler with an authorized target role and time-zone-aware schedule for the required shutdown automation.
  3. Orchestrate recovery through AWS Step Functions with explicit state transitions, retries, timeouts and approval integration.
  4. Route relevant findings into Systems Manager OpsCenter OpsItems with correlation, ownership and remediation runbook links.

Explanation

Correct Answer

A:

Deploy validated configuration through AWS AppConfig with a gradual deployment strategy and CloudWatch alarm rollback. AppConfig separates dynamic application configuration rollout from binary deployments and supports validators and controlled exposure. The relevant operational proof is specific: Only valid configuration versions reach clients and an alarm-driven rollback reverts a harmful rollout.

Incorrect Answers

B:

Use EventBridge Scheduler with an authorized target role and time-zone-aware schedule for the required shutdown automation. That would address eventbridge scheduling, because managed scheduling removes reliance on a user's workstation and invokes targets under scoped AWS permissions. However, the stated situation instead concerns appconfig progressive rollout. AppConfig separates dynamic application configuration rollout from binary deployments and supports validators and controlled exposure.

C:

Orchestrate recovery through AWS Step Functions with explicit state transitions, retries, timeouts and approval integration. That would address step functions long workflows, because step Functions coordinates multi-step asynchronous work beyond a single Lambda execution and makes failure states observable. However, the stated situation instead concerns appconfig progressive rollout. AppConfig separates dynamic application configuration rollout from binary deployments and supports validators and controlled exposure.

D:

Route relevant findings into Systems Manager OpsCenter OpsItems with correlation, ownership and remediation runbook links. That would address ssm opscenter triage, because opsCenter centralizes operational issue context and enables responders to associate related signals with accountable actions. However, the stated situation instead concerns appconfig progressive rollout. AppConfig separates dynamic application configuration rollout from binary deployments and supports validators and controlled exposure.

Question 477

GuardDuty reports high-confidence suspicious API calls from a known automation role, but a team wants to delete the role immediately without reviewing active deployments.

Which explanation best describes the technical mechanism at issue?

  1. Network Firewall inspects traffic routed through its endpoints; rules provide no protection for flows that bypass the firewall route.
  2. Security Hub unifies supported security findings and standards checks, improving cross-account triage and control visibility.
  3. Threat findings guide automated containment, but unsafe destructive actions should distinguish true incidents from legitimate operational anomalies.
  4. ACM can automate supported public certificate renewals when domain validation and service integration remain valid.

Explanation

Correct Answer

C:

Threat findings guide automated containment, but unsafe destructive actions should distinguish true incidents from legitimate operational anomalies. This explains the implementation decision: Use a severity- and evidence-aware EventBridge response flow that enriches findings and requires approval for high-impact credential or role changes. Verification should show the following: A representative finding creates a traced incident with relevant account context and invokes only authorized containment steps.

Incorrect Answers

A:

Network Firewall inspects traffic routed through its endpoints; rules provide no protection for flows that bypass the firewall route. This reasoning supports the alternative topic of network firewall inspection, for which the relevant intervention is: Deploy AWS Network Firewall with appropriate subnet placement, routing, stateless/stateful rules and logging for the inspected path. The scenario requires understanding guardduty response automation, where threat findings guide automated containment, but unsafe destructive actions should distinguish true incidents from legitimate operational anomalies.

B:

Security Hub unifies supported security findings and standards checks, improving cross-account triage and control visibility. This reasoning supports the alternative topic of security hub aggregated posture, for which the relevant intervention is: Aggregate and normalize findings through AWS Security Hub with delegated administration and clear response ownership. The scenario requires understanding guardduty response automation, where threat findings guide automated containment, but unsafe destructive actions should distinguish true incidents from legitimate operational anomalies.

D:

ACM can automate supported public certificate renewals when domain validation and service integration remain valid. This reasoning supports the alternative topic of acm certificate lifecycle, for which the relevant intervention is: Use an eligible AWS Certificate Manager managed certificate and validate DNS ownership and listener association. The scenario requires understanding guardduty response automation, where threat findings guide automated containment, but unsafe destructive actions should distinguish true incidents from legitimate operational anomalies.

Question 478

A team documents a detailed disaster recovery plan but has never exercised data restoration or application dependency order.

What risk best explains the need for a different approach?

  1. Without version history an accidental overwrite can permanently replace the only correct configuration state.
  2. Untested runbooks often hide missing permissions or dependencies that surface only during a live disaster.
  3. Keeping only templates and backups may require provisioning time longer than the business's minute-level RTO.
  4. Restoring the latest snapshot without considering its age may lose many hours of valid transactions.

Explanation

Correct Answer

B:

Untested runbooks often hide missing permissions or dependencies that surface only during a live disaster. This outcome arises from the mechanism in the situation: A DR plan is an unproven hypothesis until tested with realistic failures, credentials, dependencies and measurement. The corresponding mitigation is: Automate and regularly perform recovery game days that verify resource, data and application restoration against business targets.

Incorrect Answers

A:

Without version history an accidental overwrite can permanently replace the only correct configuration state. That is a credible concern for s3 versioned recovery, normally addressed by: Enable suitable S3 versioning and tightly controlled deletion and recovery procedures on critical configuration objects. It is not the primary failure mechanism described here. The relevant exposure is: Untested runbooks often hide missing permissions or dependencies that surface only during a live disaster.

C:

Keeping only templates and backups may require provisioning time longer than the business's minute-level RTO. That is a credible concern for warm standby recovery, normally addressed by: Maintain a reduced-capacity warm standby with replicated data and automation to scale it during failover. It is not the primary failure mechanism described here. The relevant exposure is: Untested runbooks often hide missing permissions or dependencies that surface only during a live disaster.

D:

Restoring the latest snapshot without considering its age may lose many hours of valid transactions. That is a credible concern for rds point in time recovery, normally addressed by: Use RDS automated backups and point-in-time recovery to create a new instance from an eligible timestamp, then plan controlled cutover. It is not the primary failure mechanism described here. The relevant exposure is: Untested runbooks often hide missing permissions or dependencies that surface only during a live disaster.

Question 479

A busy Lambda application emits unstructured multiline logs that cannot be correlated reliably to requests after scaling.

Which statement correctly explains the implementation tradeoff?

  1. Cross-account observability shares selected telemetry with a monitoring account without handing out permanent workload account secrets.
  2. A dedicated log archive separates custody from workload operators while encryption and scoped permissions protect retained evidence.
  3. Structured records and correlation IDs improve distributed event reconstruction and allow effective field-based queries.
  4. Subscriptions forward matching log events to a processor such as Kinesis Data Streams or Lambda shortly after ingestion.

Explanation

Correct Answer

C:

Structured records and correlation IDs improve distributed event reconstruction and allow effective field-based queries. This explains the implementation decision: Emit consistent structured log records with request identifiers, relevant severity and bounded sensitive fields into CloudWatch Logs. Verification should show the following: Logs for one request can be retrieved by its correlation identifier across related functions without exposing credentials.

Incorrect Answers

A:

Cross-account observability shares selected telemetry with a monitoring account without handing out permanent workload account secrets. This reasoning supports the alternative topic of cross account observability, for which the relevant intervention is: Use CloudWatch cross-account observability with a central monitoring account and approved source-account links where applicable. The scenario requires understanding log ingestion throughput, where structured records and correlation IDs improve distributed event reconstruction and allow effective field-based queries.

B:

A dedicated log archive separates custody from workload operators while encryption and scoped permissions protect retained evidence. This reasoning supports the alternative topic of central encrypted log archive, for which the relevant intervention is: Aggregate required audit logs into an access-restricted central S3 archive with suitable SSE-KMS encryption and lifecycle controls. The scenario requires understanding log ingestion throughput, where structured records and correlation IDs improve distributed event reconstruction and allow effective field-based queries.

D:

Subscriptions forward matching log events to a processor such as Kinesis Data Streams or Lambda shortly after ingestion. This reasoning supports the alternative topic of kinesis subscription processing, for which the relevant intervention is: Configure CloudWatch Logs subscription filters to a supported streaming destination with suitable IAM and backpressure handling. The scenario requires understanding log ingestion throughput, where structured records and correlation IDs improve distributed event reconstruction and allow effective field-based queries.

Question 480

Security needs immediate notification when an IAM policy is updated, but analysts currently inspect CloudTrail only at the end of each week.

What result would most credibly prove that the control is effective?

  1. A test event produces the correct enriched ticket and cannot reach the isolation step without its required authorization.
  2. A controlled IAM policy update generates the expected alert identifying account, role, API call and time.
  3. A test alarm reaches the on-call endpoint and the independent incident archive with matching event identifiers.
  4. The poison test message moves to the DLQ after the expected attempts and healthy queued messages complete processing.

Explanation

Correct Answer

B:

A controlled IAM policy update generates the expected alert identifying account, role, API call and time. It directly verifies the change: Use EventBridge rules for relevant CloudTrail API events and route approved matches into a security notification or response workflow. The test matters because cloudTrail management events can be matched through EventBridge to produce timely automated actions with principal and operation context.

Incorrect Answers

A:

A test event produces the correct enriched ticket and cannot reach the isolation step without its required authorization. That result would help prove step functions incident orchestration, where the relevant action is: Use a Step Functions workflow with explicit branches, task-level retries and approval-dependent transitions. It does not establish this case's required outcome. For cloudtrail privileged change event, the decisive verification is: A controlled IAM policy update generates the expected alert identifying account, role, API call and time.

C:

A test alarm reaches the on-call endpoint and the independent incident archive with matching event identifiers. That result would help prove sns fanout to teams, where the relevant action is: Publish one structured incident event to an SNS topic with appropriate independent subscriptions or downstream queue consumers. It does not establish this case's required outcome. For cloudtrail privileged change event, the decisive verification is: A controlled IAM policy update generates the expected alert identifying account, role, API call and time.

D:

The poison test message moves to the DLQ after the expected attempts and healthy queued messages complete processing. That result would help prove sqs dead letter handling, where the relevant action is: Configure an appropriate SQS redrive policy to a dead-letter queue and investigate messages that exceed the retry threshold. It does not establish this case's required outcome. For cloudtrail privileged change event, the decisive verification is: A controlled IAM policy update generates the expected alert identifying account, role, API call and time.

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