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DevNet Associate (DEVASC) 200-901 Practice Test 67

Question 660

The initial implementation fails or does not meet the expected behavior. A patch shows lines beginning with a space around '+ timeout 10' while reviewers mistakenly count every displayed line as a modification. Which investigation should be prioritized to diagnose the problem?

  1. Inspect iteration source, site allowlist, diff and reviewer approval.
  2. Inspect diff headers, hunk ranges and prefix character of each line.
  3. Inspect module name, package name, target hosts and changed status.
  4. Inspect the declared leaf-list type and encoded JSON or XML representation.

Explanation

Correct Answer

B:

Inspect diff headers, hunk ranges and prefix character of each line. These are the relevant initial evidence checks for Unified diff context versus change lines. Intended action: Distinguish unchanged context lines from added and removed lines when assessing the patch. Expected success condition: The change summary reports only the actual timeout addition and preserves context unchanged.

Incorrect Answers

A:

Inspect iteration source, site allowlist, diff and reviewer approval. This investigation primarily applies to Review deployment blast radius and rollback, not the current Unified diff context versus change lines problem. Prioritize: Inspect diff headers, hunk ranges and prefix character of each line.

C:

Inspect module name, package name, target hosts and changed status. This investigation primarily applies to Ansible package installation state, not the current Unified diff context versus change lines problem. Prioritize: Inspect diff headers, hunk ranges and prefix character of each line.

D:

Inspect the declared leaf-list type and encoded JSON or XML representation. This investigation primarily applies to Interpret YANG leaf-list of DNS servers, not the current Unified diff context versus change lines problem. Prioritize: Inspect diff headers, hunk ranges and prefix character of each line.

Question 661

A Cisco network automation team has this requirement: A network automation pull request includes a controller access key as a string literal and passes functional tests. Which design or implementation action best addresses it?

  1. Block merge, revoke any exposed secret, and require reviewer-approved secret injection before release.
  2. Run a drift-aware plan against current resources and review an approved reconciliation action.
  3. Create a gated pipeline for schema validation, simulation, review, canary deployment and wider promotion.
  4. Interpret the operation as an ACI logical application EPG inventory, not an interface inventory.

Explanation

Correct Answer

A:

Block merge, revoke any exposed secret, and require reviewer-approved secret injection before release. Technical reason: Code review evaluates security, maintainability and intent beyond whether code executes. Verify by: The revised pull request contains no real key and a secret scanner plus peer review passes. Deployment qualification: Avoid pasting original secret values into review comments or tickets.

Incorrect Answers

B:

Run a drift-aware plan against current resources and review an approved reconciliation action. This instead targets the different case Detect drift with planned IaC comparison. The described Peer review catches hard-coded credential requirement specifically calls for Block merge, revoke any exposed secret, and require reviewer-approved secret injection before release.

C:

Create a gated pipeline for schema validation, simulation, review, canary deployment and wider promotion. This instead targets the different case Infrastructure pipeline validate before apply. The described Peer review catches hard-coded credential requirement specifically calls for Block merge, revoke any exposed secret, and require reviewer-approved secret injection before release.

D:

Interpret the operation as an ACI logical application EPG inventory, not an interface inventory. This instead targets the different case Interpret ACI EPG membership script. The described Peer review catches hard-coded credential requirement specifically calls for Block merge, revoke any exposed secret, and require reviewer-approved secret injection before release.

Question 662

After deployment, an engineer must prove the proposed solution works. A network automation pull request includes a controller access key as a string literal and passes functional tests. Which observed result is the most direct acceptance evidence?

  1. The transaction is reported failed and no unauthorized configuration change is claimed.
  2. The revised pull request contains no real key and a secret scanner plus peer review passes.
  3. The change summary reports only the actual timeout addition and preserves context unchanged.
  4. Two independently built test environments show matching expected VPC/subnet/network properties.

Explanation

Correct Answer

B:

The revised pull request contains no real key and a secret scanner plus peer review passes. Recommended implementation: Block merge, revoke any exposed secret, and require reviewer-approved secret injection before release. Why the observation matters: Code review evaluates security, maintainability and intent beyond whether code executes.

Incorrect Answers

A:

The transaction is reported failed and no unauthorized configuration change is claimed. That observation could confirm Interpret NETCONF rpc-error response, not the current Peer review catches hard-coded credential case. For this case, the decisive observation is: The revised pull request contains no real key and a secret scanner plus peer review passes.

C:

The change summary reports only the actual timeout addition and preserves context unchanged. That observation could confirm Unified diff context versus change lines, not the current Peer review catches hard-coded credential case. For this case, the decisive observation is: The revised pull request contains no real key and a secret scanner plus peer review passes.

D:

Two independently built test environments show matching expected VPC/subnet/network properties. That observation could confirm Terraform declared state for repeatable sites, not the current Peer review catches hard-coded credential case. For this case, the decisive observation is: The revised pull request contains no real key and a secret scanner plus peer review passes.

Question 663

A developer is explaining the underlying technical behavior. A network automation pull request includes a controller access key as a string literal and passes functional tests. Which principle is most relevant to this case?

  1. Infrastructure as code makes desired resource definitions declarative and reviewable.
  2. Modeled constraints catch structural and allowed-value errors earlier than device trial-and-error.
  3. Code review evaluates security, maintainability and intent beyond whether code executes.
  4. Unified diff includes surrounding unchanged text to orient a patch hunk.

Explanation

Correct Answer

C:

Code review evaluates security, maintainability and intent beyond whether code executes. This mechanism explains Peer review catches hard-coded credential. Action: Block merge, revoke any exposed secret, and require reviewer-approved secret injection before release. Expected confirmation: The revised pull request contains no real key and a secret scanner plus peer review passes.

Incorrect Answers

A:

Infrastructure as code makes desired resource definitions declarative and reviewable. This relates to Terraform declared state for repeatable sites. In the current Peer review catches hard-coded credential case the operative principle is: Code review evaluates security, maintainability and intent beyond whether code executes.

B:

Modeled constraints catch structural and allowed-value errors earlier than device trial-and-error. This relates to Validate interface constraints before rollout. In the current Peer review catches hard-coded credential case the operative principle is: Code review evaluates security, maintainability and intent beyond whether code executes.

D:

Unified diff includes surrounding unchanged text to orient a patch hunk. This relates to Unified diff context versus change lines. In the current Peer review catches hard-coded credential case the operative principle is: Code review evaluates security, maintainability and intent beyond whether code executes.

Question 664

A team does not apply the necessary control or correction. A network automation pull request includes a controller access key as a string literal and passes functional tests. Which resulting failure or risk is most directly relevant?

  1. Misreading arrows can cause a script to query inventory before obtaining credentials.
  2. A green functional test cannot prove credentials are safely handled.
  3. Misreading the loop as device provisioning could lead an analyst to trust an irrelevant count.
  4. Miscounting context can exaggerate change scope or hide an actual deletion.

Explanation

Correct Answer

B:

A green functional test cannot prove credentials are safely handled. This is the direct exposure for Peer review catches hard-coded credential. Mitigate with: Block merge, revoke any exposed secret, and require reviewer-approved secret injection before release. Check success by: The revised pull request contains no real key and a secret scanner plus peer review passes.

Incorrect Answers

A:

Misreading arrows can cause a script to query inventory before obtaining credentials. This risk occurs in the different Sequence diagram shows token then inventory situation. For the given Peer review catches hard-coded credential requirement, the directly relevant risk is: A green functional test cannot prove credentials are safely handled.

C:

Misreading the loop as device provisioning could lead an analyst to trust an irrelevant count. This risk occurs in the different Interpret Meraki Python client count workflow situation. For the given Peer review catches hard-coded credential requirement, the directly relevant risk is: A green functional test cannot prove credentials are safely handled.

D:

Miscounting context can exaggerate change scope or hide an actual deletion. This risk occurs in the different Unified diff context versus change lines situation. For the given Peer review catches hard-coded credential requirement, the directly relevant risk is: A green functional test cannot prove credentials are safely handled.

Question 665

The initial implementation fails or does not meet the expected behavior. A network automation pull request includes a controller access key as a string literal and passes functional tests. Which investigation should be prioritized to diagnose the problem?

  1. Inspect changed lines, secret-scanning results and token revocation evidence.
  2. Inspect parsed show results, test definitions and baseline snapshots.
  3. Inspect APIC class query, dn attributes and object class names.
  4. Inspect resource path, HTTP method, module data and the absence of PATCH/PUT/POST.

Explanation

Correct Answer

A:

Inspect changed lines, secret-scanning results and token revocation evidence. These are the relevant initial evidence checks for Peer review catches hard-coded credential. Intended action: Block merge, revoke any exposed secret, and require reviewer-approved secret injection before release. Expected success condition: The revised pull request contains no real key and a secret scanner plus peer review passes.

Incorrect Answers

B:

Inspect parsed show results, test definitions and baseline snapshots. This investigation primarily applies to pyATS structured network state verification, not the current Peer review catches hard-coded credential problem. Prioritize: Inspect changed lines, secret-scanning results and token revocation evidence.

C:

Inspect APIC class query, dn attributes and object class names. This investigation primarily applies to Interpret ACI EPG membership script, not the current Peer review catches hard-coded credential problem. Prioritize: Inspect changed lines, secret-scanning results and token revocation evidence.

D:

Inspect resource path, HTTP method, module data and the absence of PATCH/PUT/POST. This investigation primarily applies to Interpret RESTCONF configuration retrieval, not the current Peer review catches hard-coded credential problem. Prioritize: Inspect changed lines, secret-scanning results and token revocation evidence.

Question 666

A Cisco network automation team has this requirement: A pull request loops over every site and PATCHes the same ACL without a site filter, but CI syntax checks are green. Which design or implementation action best addresses it?

  1. Require a reviewed target scope, simulation and rollback plan before approving the automation.
  2. Make the pipeline depend on a successful pyATS test artifact before promoting the change.
  3. Distinguish unchanged context lines from added and removed lines when assessing the patch.
  4. Use a supported device-level read API such as IOS XE RESTCONF for that router rather than assuming controller inventory exists.

Explanation

Correct Answer

A:

Require a reviewed target scope, simulation and rollback plan before approving the automation. Technical reason: Code review can catch logical change scope that static syntax checks miss. Verify by: The final patch targets only pilot sites and demonstrates a safe failure recovery path. Deployment qualification: Review must assess the real permissions and side effects of API calls, not only loop syntax.

Incorrect Answers

B:

Make the pipeline depend on a successful pyATS test artifact before promoting the change. This instead targets the different case Block a network rollout on failed pyATS checks. The described Review deployment blast radius and rollback requirement specifically calls for Require a reviewed target scope, simulation and rollback plan before approving the automation.

C:

Distinguish unchanged context lines from added and removed lines when assessing the patch. This instead targets the different case Unified diff context versus change lines. The described Review deployment blast radius and rollback requirement specifically calls for Require a reviewed target scope, simulation and rollback plan before approving the automation.

D:

Use a supported device-level read API such as IOS XE RESTCONF for that router rather than assuming controller inventory exists. This instead targets the different case Device-level interface test outside controller policy. The described Review deployment blast radius and rollback requirement specifically calls for Require a reviewed target scope, simulation and rollback plan before approving the automation.

Question 667

After deployment, an engineer must prove the proposed solution works. A pull request loops over every site and PATCHes the same ACL without a site filter, but CI syntax checks are green. Which observed result is the most direct acceptance evidence?

  1. The final patch targets only pilot sites and demonstrates a safe failure recovery path.
  2. A simulated backup reports success only when the job state becomes complete and the artifact exists.
  3. The transaction is reported failed and no unauthorized configuration change is claimed.
  4. Two independently built test environments show matching expected VPC/subnet/network properties.

Explanation

Correct Answer

A:

The final patch targets only pilot sites and demonstrates a safe failure recovery path. Recommended implementation: Require a reviewed target scope, simulation and rollback plan before approving the automation. Why the observation matters: Code review can catch logical change scope that static syntax checks miss.

Incorrect Answers

B:

A simulated backup reports success only when the job state becomes complete and the artifact exists. That observation could confirm Sequence diagram 202 job polling loop, not the current Review deployment blast radius and rollback case. For this case, the decisive observation is: The final patch targets only pilot sites and demonstrates a safe failure recovery path.

C:

The transaction is reported failed and no unauthorized configuration change is claimed. That observation could confirm Interpret NETCONF rpc-error response, not the current Review deployment blast radius and rollback case. For this case, the decisive observation is: The final patch targets only pilot sites and demonstrates a safe failure recovery path.

D:

Two independently built test environments show matching expected VPC/subnet/network properties. That observation could confirm Terraform declared state for repeatable sites, not the current Review deployment blast radius and rollback case. For this case, the decisive observation is: The final patch targets only pilot sites and demonstrates a safe failure recovery path.

Question 668

A developer is explaining the underlying technical behavior. A pull request loops over every site and PATCHes the same ACL without a site filter, but CI syntax checks are green. Which principle is most relevant to this case?

  1. Code review can catch logical change scope that static syntax checks miss.
  2. Sequence loops can represent repeated asynchronous status checks after initial request acceptance.
  3. Model-driven automation uses structured schemas and operations to represent intended configuration.
  4. A testbed file separates device connectivity inventory from verification functions.

Explanation

Correct Answer

A:

Code review can catch logical change scope that static syntax checks miss. This mechanism explains Review deployment blast radius and rollback. Action: Require a reviewed target scope, simulation and rollback plan before approving the automation. Expected confirmation: The final patch targets only pilot sites and demonstrates a safe failure recovery path.

Incorrect Answers

B:

Sequence loops can represent repeated asynchronous status checks after initial request acceptance. This relates to Sequence diagram 202 job polling loop. In the current Review deployment blast radius and rollback case the operative principle is: Code review can catch logical change scope that static syntax checks miss.

C:

Model-driven automation uses structured schemas and operations to represent intended configuration. This relates to Desired-state YANG instead of CLI scraping. In the current Review deployment blast radius and rollback case the operative principle is: Code review can catch logical change scope that static syntax checks miss.

D:

A testbed file separates device connectivity inventory from verification functions. This relates to Testbed metadata for automated lab connections. In the current Review deployment blast radius and rollback case the operative principle is: Code review can catch logical change scope that static syntax checks miss.

Question 669

A team does not apply the necessary control or correction. A pull request loops over every site and PATCHes the same ACL without a site filter, but CI syntax checks are green. Which resulting failure or risk is most directly relevant?

  1. An unbounded loop can turn one incorrect policy into an enterprise-wide outage.
  2. Ignoring failed network tests can spread an outage despite available detection.
  3. Confusing a device setting with transport status can invert monitoring alerts.
  4. Skipping the polling phase creates false completion reports.

Explanation

Correct Answer

A:

An unbounded loop can turn one incorrect policy into an enterprise-wide outage. This is the direct exposure for Review deployment blast radius and rollback. Mitigate with: Require a reviewed target scope, simulation and rollback plan before approving the automation. Check success by: The final patch targets only pilot sites and demonstrates a safe failure recovery path.

Incorrect Answers

B:

Ignoring failed network tests can spread an outage despite available detection. This risk occurs in the different Block a network rollout on failed pyATS checks situation. For the given Review deployment blast radius and rollback requirement, the directly relevant risk is: An unbounded loop can turn one incorrect policy into an enterprise-wide outage.

C:

Confusing a device setting with transport status can invert monitoring alerts. This risk occurs in the different Interpret RESTCONF HTTP 200 resource data situation. For the given Review deployment blast radius and rollback requirement, the directly relevant risk is: An unbounded loop can turn one incorrect policy into an enterprise-wide outage.

D:

Skipping the polling phase creates false completion reports. This risk occurs in the different Sequence diagram 202 job polling loop situation. For the given Review deployment blast radius and rollback requirement, the directly relevant risk is: An unbounded loop can turn one incorrect policy into an enterprise-wide outage.

Question 670

The initial implementation fails or does not meet the expected behavior. A pull request loops over every site and PATCHes the same ACL without a site filter, but CI syntax checks are green. Which investigation should be prioritized to diagnose the problem?

  1. Inspect CI job ordering, review approval and pilot switch state.
  2. Inspect iteration source, site allowlist, diff and reviewer approval.
  3. Inspect module name, package name, target hosts and changed status.
  4. Inspect resource path, HTTP method, module data and the absence of PATCH/PUT/POST.

Explanation

Correct Answer

B:

Inspect iteration source, site allowlist, diff and reviewer approval. These are the relevant initial evidence checks for Review deployment blast radius and rollback. Intended action: Require a reviewed target scope, simulation and rollback plan before approving the automation. Expected success condition: The final patch targets only pilot sites and demonstrates a safe failure recovery path.

Incorrect Answers

A:

Inspect CI job ordering, review approval and pilot switch state. This investigation primarily applies to Infrastructure pipeline validate before apply, not the current Review deployment blast radius and rollback problem. Prioritize: Inspect iteration source, site allowlist, diff and reviewer approval.

C:

Inspect module name, package name, target hosts and changed status. This investigation primarily applies to Ansible package installation state, not the current Review deployment blast radius and rollback problem. Prioritize: Inspect iteration source, site allowlist, diff and reviewer approval.

D:

Inspect resource path, HTTP method, module data and the absence of PATCH/PUT/POST. This investigation primarily applies to Interpret RESTCONF configuration retrieval, not the current Review deployment blast radius and rollback problem. Prioritize: Inspect iteration source, site allowlist, diff and reviewer approval.

DevNet Associate (DEVASC) (200-901) Practice Tests

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