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DevNet Associate (DEVASC) 200-901 Practice Test 65

Question 640

The initial implementation fails or does not meet the expected behavior. A NETCONF server replies with rpc-error error-tag access-denied to an edit-config request; a script treats the presence of an rpc-reply wrapper as success. Which investigation should be prioritized to diagnose the problem?

  1. Inspect schema mandatory statements, validation path and returned error.
  2. Inspect error-tag, error-message, selected datastore and user role.
  3. Inspect playbook module selection, changed flags and resulting configuration.
  4. Inspect resource path, HTTP method, module data and the absence of PATCH/PUT/POST.

Explanation

Correct Answer

B:

Inspect error-tag, error-message, selected datastore and user role. These are the relevant initial evidence checks for Interpret NETCONF rpc-error response. Intended action: Treat the rpc-error as a failed configuration operation and investigate authorization or datastore permissions. Expected success condition: The transaction is reported failed and no unauthorized configuration change is claimed.

Incorrect Answers

A:

Inspect schema mandatory statements, validation path and returned error. This investigation primarily applies to Interpret YANG mandatory leaf, not the current Interpret NETCONF rpc-error response problem. Prioritize: Inspect error-tag, error-message, selected datastore and user role.

C:

Inspect playbook module selection, changed flags and resulting configuration. This investigation primarily applies to Ansible playbook for idempotent configuration, not the current Interpret NETCONF rpc-error response problem. Prioritize: Inspect error-tag, error-message, selected datastore and user role.

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 Interpret NETCONF rpc-error response problem. Prioritize: Inspect error-tag, error-message, selected datastore and user role.

Question 641

A Cisco network automation team has this requirement: A YANG model defines dns-server as a leaf-list; a client attempts to create separate arbitrary child names for two resolvers. Which design or implementation action best addresses it?

  1. Identify the script as a per-network client-observation inventory and validate its time-window filter.
  2. Interpret the task as starting the service now and configuring it to start at boot where supported.
  3. Represent multiple valid resolver addresses as entries of the same leaf-list under its parent.
  4. Use Terraform for supported provisioning/resource lifecycle and Ansible for suitable guest configuration orchestration.

Explanation

Correct Answer

C:

Represent multiple valid resolver addresses as entries of the same leaf-list under its parent. Technical reason: A YANG leaf-list is a sequence of scalar values rather than a list of keyed records. Verify by: Validation accepts the two values without inventing child element names. Deployment qualification: Ordering and duplicate rules can vary with ordered-by and constraints.

Incorrect Answers

A:

Identify the script as a per-network client-observation inventory and validate its time-window filter. This instead targets the different case Interpret Meraki Python client count workflow. The described Interpret YANG leaf-list of DNS servers requirement specifically calls for Represent multiple valid resolver addresses as entries of the same leaf-list under its parent.

B:

Interpret the task as starting the service now and configuring it to start at boot where supported. This instead targets the different case Ansible service started and enabled. The described Interpret YANG leaf-list of DNS servers requirement specifically calls for Represent multiple valid resolver addresses as entries of the same leaf-list under its parent.

D:

Use Terraform for supported provisioning/resource lifecycle and Ansible for suitable guest configuration orchestration. This instead targets the different case Terraform versus Ansible responsibilities. The described Interpret YANG leaf-list of DNS servers requirement specifically calls for Represent multiple valid resolver addresses as entries of the same leaf-list under its parent.

Question 642

After deployment, an engineer must prove the proposed solution works. A YANG model defines dns-server as a leaf-list; a client attempts to create separate arbitrary child names for two resolvers. Which observed result is the most direct acceptance evidence?

  1. The router returns the exact interface counter without affecting other devices.
  2. Validation accepts the two values without inventing child element names.
  3. The change summary reports only the actual timeout addition and preserves context unchanged.
  4. A simulated link failure converges to an approved backup and structured assertions pass.

Explanation

Correct Answer

B:

Validation accepts the two values without inventing child element names. Recommended implementation: Represent multiple valid resolver addresses as entries of the same leaf-list under its parent. Why the observation matters: A YANG leaf-list is a sequence of scalar values rather than a list of keyed records.

Incorrect Answers

A:

The router returns the exact interface counter without affecting other devices. That observation could confirm Device-level interface test outside controller policy, not the current Interpret YANG leaf-list of DNS servers case. For this case, the decisive observation is: Validation accepts the two values without inventing child element names.

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 Interpret YANG leaf-list of DNS servers case. For this case, the decisive observation is: Validation accepts the two values without inventing child element names.

D:

A simulated link failure converges to an approved backup and structured assertions pass. That observation could confirm CML and pyATS roles in preflight, not the current Interpret YANG leaf-list of DNS servers case. For this case, the decisive observation is: Validation accepts the two values without inventing child element names.

Question 643

A developer is explaining the underlying technical behavior. A YANG model defines dns-server as a leaf-list; a client attempts to create separate arbitrary child names for two resolvers. Which principle is most relevant to this case?

  1. RESTCONF GET retrieves YANG-modeled resources over HTTP rather than pushing a configuration update.
  2. A YANG leaf-list is a sequence of scalar values rather than a list of keyed records.
  3. Network simulation provides a safe environment for examining design behavior before live deployment.
  4. Simulation tests system dynamics; test frameworks provide machine-checked acceptance evidence.

Explanation

Correct Answer

B:

A YANG leaf-list is a sequence of scalar values rather than a list of keyed records. This mechanism explains Interpret YANG leaf-list of DNS servers. Action: Represent multiple valid resolver addresses as entries of the same leaf-list under its parent. Expected confirmation: Validation accepts the two values without inventing child element names.

Incorrect Answers

A:

RESTCONF GET retrieves YANG-modeled resources over HTTP rather than pushing a configuration update. This relates to Interpret RESTCONF configuration retrieval. In the current Interpret YANG leaf-list of DNS servers case the operative principle is: A YANG leaf-list is a sequence of scalar values rather than a list of keyed records.

C:

Network simulation provides a safe environment for examining design behavior before live deployment. This relates to Cisco Modeling Labs topology before production change. In the current Interpret YANG leaf-list of DNS servers case the operative principle is: A YANG leaf-list is a sequence of scalar values rather than a list of keyed records.

D:

Simulation tests system dynamics; test frameworks provide machine-checked acceptance evidence. This relates to CML and pyATS roles in preflight. In the current Interpret YANG leaf-list of DNS servers case the operative principle is: A YANG leaf-list is a sequence of scalar values rather than a list of keyed records.

Question 644

A team does not apply the necessary control or correction. A YANG model defines dns-server as a leaf-list; a client attempts to create separate arbitrary child names for two resolvers. Which resulting failure or risk is most directly relevant?

  1. Removing the guard can make repeated provisioning fail or collide with existing accounts.
  2. Applying blindly can destroy emergency changes or preserve an unauthorized exposure.
  3. Querying an unrelated controller could give incomplete or stale device state.
  4. Inventing per-entry objects conflicts with the modeled schema.

Explanation

Correct Answer

D:

Inventing per-entry objects conflicts with the modeled schema. This is the direct exposure for Interpret YANG leaf-list of DNS servers. Mitigate with: Represent multiple valid resolver addresses as entries of the same leaf-list under its parent. Check success by: Validation accepts the two values without inventing child element names.

Incorrect Answers

A:

Removing the guard can make repeated provisioning fail or collide with existing accounts. This risk occurs in the different Bash user creation guarded by id situation. For the given Interpret YANG leaf-list of DNS servers requirement, the directly relevant risk is: Inventing per-entry objects conflicts with the modeled schema.

B:

Applying blindly can destroy emergency changes or preserve an unauthorized exposure. This risk occurs in the different Detect drift with planned IaC comparison situation. For the given Interpret YANG leaf-list of DNS servers requirement, the directly relevant risk is: Inventing per-entry objects conflicts with the modeled schema.

C:

Querying an unrelated controller could give incomplete or stale device state. This risk occurs in the different Device-level interface test outside controller policy situation. For the given Interpret YANG leaf-list of DNS servers requirement, the directly relevant risk is: Inventing per-entry objects conflicts with the modeled schema.

Question 645

The initial implementation fails or does not meet the expected behavior. A YANG model defines dns-server as a leaf-list; a client attempts to create separate arbitrary child names for two resolvers. Which investigation should be prioritized to diagnose the problem?

  1. Inspect status line, interface key and the boolean leaf in the returned model.
  2. Inspect testbed YAML, device aliases and authentication/connection logs.
  3. Inspect the declared leaf-list type and encoded JSON or XML representation.
  4. Inspect YANG schema, desired-state diff, structured device data and repeated-run results.

Explanation

Correct Answer

C:

Inspect the declared leaf-list type and encoded JSON or XML representation. These are the relevant initial evidence checks for Interpret YANG leaf-list of DNS servers. Intended action: Represent multiple valid resolver addresses as entries of the same leaf-list under its parent. Expected success condition: Validation accepts the two values without inventing child element names.

Incorrect Answers

A:

Inspect status line, interface key and the boolean leaf in the returned model. This investigation primarily applies to Interpret RESTCONF HTTP 200 resource data, not the current Interpret YANG leaf-list of DNS servers problem. Prioritize: Inspect the declared leaf-list type and encoded JSON or XML representation.

B:

Inspect testbed YAML, device aliases and authentication/connection logs. This investigation primarily applies to Testbed metadata for automated lab connections, not the current Interpret YANG leaf-list of DNS servers problem. Prioritize: Inspect the declared leaf-list type and encoded JSON or XML representation.

D:

Inspect YANG schema, desired-state diff, structured device data and repeated-run results. This investigation primarily applies to Desired-state YANG instead of CLI scraping, not the current Interpret YANG leaf-list of DNS servers problem. Prioritize: Inspect the declared leaf-list type and encoded JSON or XML representation.

Question 646

A Cisco network automation team has this requirement: A model marks hostname as mandatory within a created device entry, but automation sends only its list key. Which design or implementation action best addresses it?

  1. Model the relevant topology and protocol settings in Cisco Modeling Labs before the controlled rollout.
  2. Block merge, revoke any exposed secret, and require reviewer-approved secret injection before release.
  3. Use pyATS/Genie structured parsing and automated comparison for relevant learned routes and interfaces.
  4. Include the required hostname leaf in the created modeled object before committing.

Explanation

Correct Answer

D:

Include the required hostname leaf in the created modeled object before committing. Technical reason: YANG mandatory constraints require specified nodes to exist in applicable instances. Verify by: The validator rejects key-only data and accepts the object containing the mandatory field. Deployment qualification: Conditional constraints can additionally be expressed through when or must statements.

Incorrect Answers

A:

Model the relevant topology and protocol settings in Cisco Modeling Labs before the controlled rollout. This instead targets the different case Cisco Modeling Labs topology before production change. The described Interpret YANG mandatory leaf requirement specifically calls for Include the required hostname leaf in the created modeled object before committing.

B:

Block merge, revoke any exposed secret, and require reviewer-approved secret injection before release. This instead targets the different case Peer review catches hard-coded credential. The described Interpret YANG mandatory leaf requirement specifically calls for Include the required hostname leaf in the created modeled object before committing.

C:

Use pyATS/Genie structured parsing and automated comparison for relevant learned routes and interfaces. This instead targets the different case pyATS structured network state verification. The described Interpret YANG mandatory leaf requirement specifically calls for Include the required hostname leaf in the created modeled object before committing.

Question 647

After deployment, an engineer must prove the proposed solution works. A model marks hostname as mandatory within a created device entry, but automation sends only its list key. Which observed result is the most direct acceptance evidence?

  1. The change summary reports only the actual timeout addition and preserves context unchanged.
  2. Fixture networks yield a total based only on clients seen during the selected interval.
  3. A test directory retains new logs while old matching .log files are removed.
  4. The validator rejects key-only data and accepts the object containing the mandatory field.

Explanation

Correct Answer

D:

The validator rejects key-only data and accepts the object containing the mandatory field. Recommended implementation: Include the required hostname leaf in the created modeled object before committing. Why the observation matters: YANG mandatory constraints require specified nodes to exist in applicable instances.

Incorrect Answers

A:

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 Interpret YANG mandatory leaf case. For this case, the decisive observation is: The validator rejects key-only data and accepts the object containing the mandatory field.

B:

Fixture networks yield a total based only on clients seen during the selected interval. That observation could confirm Interpret Meraki Python client count workflow, not the current Interpret YANG mandatory leaf case. For this case, the decisive observation is: The validator rejects key-only data and accepts the object containing the mandatory field.

C:

A test directory retains new logs while old matching .log files are removed. That observation could confirm Bash script conditional cleanup workflow, not the current Interpret YANG mandatory leaf case. For this case, the decisive observation is: The validator rejects key-only data and accepts the object containing the mandatory field.

Question 648

A developer is explaining the underlying technical behavior. A model marks hostname as mandatory within a created device entry, but automation sends only its list key. Which principle is most relevant to this case?

  1. Ansible state: present requests the target resource exist; state: absent requests removal.
  2. ACI endpoint groups are policy objects describing groups of endpoints, not physical access ports.
  3. NETCONF RPC replies distinguish success acknowledgements from structured error elements.
  4. YANG mandatory constraints require specified nodes to exist in applicable instances.

Explanation

Correct Answer

D:

YANG mandatory constraints require specified nodes to exist in applicable instances. This mechanism explains Interpret YANG mandatory leaf. Action: Include the required hostname leaf in the created modeled object before committing. Expected confirmation: The validator rejects key-only data and accepts the object containing the mandatory field.

Incorrect Answers

A:

Ansible state: present requests the target resource exist; state: absent requests removal. This relates to Ansible package installation state. In the current Interpret YANG mandatory leaf case the operative principle is: YANG mandatory constraints require specified nodes to exist in applicable instances.

B:

ACI endpoint groups are policy objects describing groups of endpoints, not physical access ports. This relates to Interpret ACI EPG membership script. In the current Interpret YANG mandatory leaf case the operative principle is: YANG mandatory constraints require specified nodes to exist in applicable instances.

C:

NETCONF RPC replies distinguish success acknowledgements from structured error elements. This relates to Interpret NETCONF rpc-error response. In the current Interpret YANG mandatory leaf case the operative principle is: YANG mandatory constraints require specified nodes to exist in applicable instances.

Question 649

A team does not apply the necessary control or correction. A model marks hostname as mandatory within a created device entry, but automation sends only its list key. Which resulting failure or risk is most directly relevant?

  1. Skipping mandatory modeled values produces invalid configuration despite an authentic session.
  2. Ignoring failed network tests can spread an outage despite available detection.
  3. Deploying an untested BGP route-map can blackhole remote applications at scale.
  4. Misusing imperative provisioners as core state management makes drift and retries difficult.

Explanation

Correct Answer

A:

Skipping mandatory modeled values produces invalid configuration despite an authentic session. This is the direct exposure for Interpret YANG mandatory leaf. Mitigate with: Include the required hostname leaf in the created modeled object before committing. Check success by: The validator rejects key-only data and accepts the object containing the mandatory field.

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 Interpret YANG mandatory leaf requirement, the directly relevant risk is: Skipping mandatory modeled values produces invalid configuration despite an authentic session.

C:

Deploying an untested BGP route-map can blackhole remote applications at scale. This risk occurs in the different Cisco Modeling Labs topology before production change situation. For the given Interpret YANG mandatory leaf requirement, the directly relevant risk is: Skipping mandatory modeled values produces invalid configuration despite an authentic session.

D:

Misusing imperative provisioners as core state management makes drift and retries difficult. This risk occurs in the different Terraform versus Ansible responsibilities situation. For the given Interpret YANG mandatory leaf requirement, the directly relevant risk is: Skipping mandatory modeled values produces invalid configuration despite an authentic session.

Question 650

The initial implementation fails or does not meet the expected behavior. A model marks hostname as mandatory within a created device entry, but automation sends only its list key. Which investigation should be prioritized to diagnose the problem?

  1. Inspect data-model range definitions, validation error and device commit history.
  2. Inspect service facts, task parameters and service manager status.
  3. Inspect schema mandatory statements, validation path and returned error.
  4. Inspect loop fragment, status responses and the final backup artifact retrieval.

Explanation

Correct Answer

C:

Inspect schema mandatory statements, validation path and returned error. These are the relevant initial evidence checks for Interpret YANG mandatory leaf. Intended action: Include the required hostname leaf in the created modeled object before committing. Expected success condition: The validator rejects key-only data and accepts the object containing the mandatory field.

Incorrect Answers

A:

Inspect data-model range definitions, validation error and device commit history. This investigation primarily applies to Validate interface constraints before rollout, not the current Interpret YANG mandatory leaf problem. Prioritize: Inspect schema mandatory statements, validation path and returned error.

B:

Inspect service facts, task parameters and service manager status. This investigation primarily applies to Ansible service started and enabled, not the current Interpret YANG mandatory leaf problem. Prioritize: Inspect schema mandatory statements, validation path and returned error.

D:

Inspect loop fragment, status responses and the final backup artifact retrieval. This investigation primarily applies to Sequence diagram 202 job polling loop, not the current Interpret YANG mandatory leaf problem. Prioritize: Inspect schema mandatory statements, validation path and returned error.

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

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