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DevNet Associate (DEVASC) 200-901 Practice Test 4

Question 30

The initial implementation fails or does not meet the expected behavior. A local automation repository accepts pull requests that change YAML configuration and a proposed loader enables arbitrary Python object deserialization. Which investigation should be prioritized to diagnose the problem?

  1. Inspect subscriber registration, event dispatch and a controlled down/up notification test.
  2. Inspect function boundaries, call graph and tests for each responsibility.
  3. Review loader API, accepted YAML tags, and a controlled rejection test.
  4. Capture outbound Content-Type and body bytes, and compare them against the endpoint example.

Explanation

Correct Answer

C:

Review loader API, accepted YAML tags, and a controlled rejection test. These are the relevant initial evidence checks for Safely parse YAML without object construction. Intended action: Use yaml.safe_load with schema validation for the untrusted configuration document. Expected success condition: A harmless mapping parses while a malicious Python-specific constructor is rejected.

Incorrect Answers

A:

Inspect subscriber registration, event dispatch and a controlled down/up notification test. This investigation primarily applies to Observer for device event subscribers, not the current Safely parse YAML without object construction problem. Prioritize: Review loader API, accepted YAML tags, and a controlled rejection test.

B:

Inspect function boundaries, call graph and tests for each responsibility. This investigation primarily applies to Single responsibility for inventory processing, not the current Safely parse YAML without object construction problem. Prioritize: Review loader API, accepted YAML tags, and a controlled rejection test.

D:

Capture outbound Content-Type and body bytes, and compare them against the endpoint example. This investigation primarily applies to YAML config versus JSON API body, not the current Safely parse YAML without object construction problem. Prioritize: Review loader API, accepted YAML tags, and a controlled rejection test.

Question 31

A Cisco network automation team has this requirement: An XML event declares <port name="Gi1"><speed>1000</speed></port>, but a script looks for name as a child element and reports empty interfaces. Which design or implementation action best addresses it?

  1. Read the name attribute on the port element and the speed text from its child with an XML parser.
  2. Use an XML parser with explicit namespace mappings to select the required interface elements.
  3. Plan short iterations with a prioritized backlog and working increments reviewed by users.
  4. Use separately constructed tenant-scoped client instances rather than one shared mutable singleton.

Explanation

Correct Answer

A:

Read the name attribute on the port element and the speed text from its child with an XML parser. Technical reason: XML attributes and child elements are separate constructs in the parsed tree. Verify by: The parser obtains Gi1 and integer 1000 from the fixture without searching raw text. Deployment qualification: Converting element text to integers still needs input validation.

Incorrect Answers

B:

Use an XML parser with explicit namespace mappings to select the required interface elements. This instead targets the different case XML namespaces in network configuration. The described Distinguish XML attribute from element text requirement specifically calls for Read the name attribute on the port element and the speed text from its child with an XML parser.

C:

Plan short iterations with a prioritized backlog and working increments reviewed by users. This instead targets the different case Agile iteration for uncertain feature requirements. The described Distinguish XML attribute from element text requirement specifically calls for Read the name attribute on the port element and the speed text from its child with an XML parser.

D:

Use separately constructed tenant-scoped client instances rather than one shared mutable singleton. This instead targets the different case Avoid Singleton for tenant-specific token clients. The described Distinguish XML attribute from element text requirement specifically calls for Read the name attribute on the port element and the speed text from its child with an XML parser.

Question 32

After deployment, an engineer must prove the proposed solution works. An XML event declares <port name="Gi1"><speed>1000</speed></port>, but a script looks for name as a child element and reports empty interfaces. Which observed result is the most direct acceptance evidence?

  1. The parser obtains Gi1 and integer 1000 from the fixture without searching raw text.
  2. The disabled flag evaluates false and the integer retry count remains zero without string comparisons.
  3. Two subscribers receive the same state-change event without the publisher importing their implementations.
  4. Repeated offline test runs yield identical output regardless of sandbox uptime.

Explanation

Correct Answer

A:

The parser obtains Gi1 and integer 1000 from the fixture without searching raw text. Recommended implementation: Read the name attribute on the port element and the speed text from its child with an XML parser. Why the observation matters: XML attributes and child elements are separate constructs in the parsed tree.

Incorrect Answers

B:

The disabled flag evaluates false and the integer retry count remains zero without string comparisons. That observation could confirm Preserve numeric and boolean data types, not the current Distinguish XML attribute from element text case. For this case, the decisive observation is: The parser obtains Gi1 and integer 1000 from the fixture without searching raw text.

C:

Two subscribers receive the same state-change event without the publisher importing their implementations. That observation could confirm Observer for device event subscribers, not the current Distinguish XML attribute from element text case. For this case, the decisive observation is: The parser obtains Gi1 and integer 1000 from the fixture without searching raw text.

D:

Repeated offline test runs yield identical output regardless of sandbox uptime. That observation could confirm Mock external HTTP calls in unit tests, not the current Distinguish XML attribute from element text case. For this case, the decisive observation is: The parser obtains Gi1 and integer 1000 from the fixture without searching raw text.

Question 33

A developer is explaining the underlying technical behavior. An XML event declares <port name="Gi1"><speed>1000</speed></port>, but a script looks for name as a child element and reports empty interfaces. Which principle is most relevant to this case?

  1. JSON natively expresses objects and arrays while XML represents data as elements and attributes.
  2. MVC separates state/data, interaction coordination and user-interface rendering.
  3. Observer decouples event producers from multiple dependent consumers.
  4. XML attributes and child elements are separate constructs in the parsed tree.

Explanation

Correct Answer

D:

XML attributes and child elements are separate constructs in the parsed tree. This mechanism explains Distinguish XML attribute from element text. Action: Read the name attribute on the port element and the speed text from its child with an XML parser. Expected confirmation: The parser obtains Gi1 and integer 1000 from the fixture without searching raw text.

Incorrect Answers

A:

JSON natively expresses objects and arrays while XML represents data as elements and attributes. This relates to JSON versus XML for a telemetry consumer. In the current Distinguish XML attribute from element text case the operative principle is: XML attributes and child elements are separate constructs in the parsed tree.

B:

MVC separates state/data, interaction coordination and user-interface rendering. This relates to MVC isolates controller logic from UI. In the current Distinguish XML attribute from element text case the operative principle is: XML attributes and child elements are separate constructs in the parsed tree.

C:

Observer decouples event producers from multiple dependent consumers. This relates to Observer for device event subscribers. In the current Distinguish XML attribute from element text case the operative principle is: XML attributes and child elements are separate constructs in the parsed tree.

Question 34

A team does not apply the necessary control or correction. An XML event declares <port name="Gi1"><speed>1000</speed></port>, but a script looks for name as a child element and reports empty interfaces. Which resulting failure or risk is most directly relevant?

  1. A fixed long specification can lock in an unhelpful interface before operators see a working version.
  2. Fixing one sample without a regression test allows the failure to return unnoticed.
  3. Treating an attribute as a child element silently loses required inventory identifiers.
  4. Uncontrolled scope changes during deployment would violate documented compliance signoffs.

Explanation

Correct Answer

C:

Treating an attribute as a child element silently loses required inventory identifiers. This is the direct exposure for Distinguish XML attribute from element text. Mitigate with: Read the name attribute on the port element and the speed text from its child with an XML parser. Check success by: The parser obtains Gi1 and integer 1000 from the fixture without searching raw text.

Incorrect Answers

A:

A fixed long specification can lock in an unhelpful interface before operators see a working version. This risk occurs in the different Agile iteration for uncertain feature requirements situation. For the given Distinguish XML attribute from element text requirement, the directly relevant risk is: Treating an attribute as a child element silently loses required inventory identifiers.

B:

Fixing one sample without a regression test allows the failure to return unnoticed. This risk occurs in the different Regression test after parser bug fix situation. For the given Distinguish XML attribute from element text requirement, the directly relevant risk is: Treating an attribute as a child element silently loses required inventory identifiers.

D:

Uncontrolled scope changes during deployment would violate documented compliance signoffs. This risk occurs in the different Waterfall for a tightly approved migration situation. For the given Distinguish XML attribute from element text requirement, the directly relevant risk is: Treating an attribute as a child element silently loses required inventory identifiers.

Question 35

The initial implementation fails or does not meet the expected behavior. An XML event declares <port name="Gi1"><speed>1000</speed></port>, but a script looks for name as a child element and reports empty interfaces. Which investigation should be prioritized to diagnose the problem?

  1. Inspect the response Content-Type, sample JSON object shape and parser exceptions.
  2. Inspect the exact diff range, commit set and tests covering changed behavior.
  3. Capture outbound Content-Type and body bytes, and compare them against the endpoint example.
  4. Inspect the parsed node attrib mapping and findtext result with a representative response.

Explanation

Correct Answer

D:

Inspect the parsed node attrib mapping and findtext result with a representative response. These are the relevant initial evidence checks for Distinguish XML attribute from element text. Intended action: Read the name attribute on the port element and the speed text from its child with an XML parser. Expected success condition: The parser obtains Gi1 and integer 1000 from the fixture without searching raw text.

Incorrect Answers

A:

Inspect the response Content-Type, sample JSON object shape and parser exceptions. This investigation primarily applies to JSON versus XML for a telemetry consumer, not the current Distinguish XML attribute from element text problem. Prioritize: Inspect the parsed node attrib mapping and findtext result with a representative response.

B:

Inspect the exact diff range, commit set and tests covering changed behavior. This investigation primarily applies to Use git diff before reviewing an endpoint change, not the current Distinguish XML attribute from element text problem. Prioritize: Inspect the parsed node attrib mapping and findtext result with a representative response.

C:

Capture outbound Content-Type and body bytes, and compare them against the endpoint example. This investigation primarily applies to YAML config versus JSON API body, not the current Distinguish XML attribute from element text problem. Prioritize: Inspect the parsed node attrib mapping and findtext result with a representative response.

Question 36

A Cisco network automation team has this requirement: A Python function will compute the first available VLAN ID; developers plan to code it first and only later try a few examples manually. Which design or implementation action best addresses it?

  1. Stage the reviewed parser path explicitly and confirm the index before committing.
  2. Publish a device-state event and let independent registered subscribers handle notifications.
  3. Define an automated failing unit test for reserved and allocated VLAN IDs before implementing selection logic.
  4. Use separately constructed tenant-scoped client instances rather than one shared mutable singleton.

Explanation

Correct Answer

C:

Define an automated failing unit test for reserved and allocated VLAN IDs before implementing selection logic. Technical reason: Test-driven development follows red, green, refactor with executable expected behavior. Verify by: The new test fails against an empty implementation and passes after the correct selection function is added. Deployment qualification: Tests must include edge cases such as an exhausted allowed VLAN range.

Incorrect Answers

A:

Stage the reviewed parser path explicitly and confirm the index before committing. This instead targets the different case Stage only the intended file before commit. The described Write a failing test before implementation requirement specifically calls for Define an automated failing unit test for reserved and allocated VLAN IDs before implementing selection logic.

B:

Publish a device-state event and let independent registered subscribers handle notifications. This instead targets the different case Observer for device event subscribers. The described Write a failing test before implementation requirement specifically calls for Define an automated failing unit test for reserved and allocated VLAN IDs before implementing selection logic.

D:

Use separately constructed tenant-scoped client instances rather than one shared mutable singleton. This instead targets the different case Avoid Singleton for tenant-specific token clients. The described Write a failing test before implementation requirement specifically calls for Define an automated failing unit test for reserved and allocated VLAN IDs before implementing selection logic.

Question 37

After deployment, an engineer must prove the proposed solution works. A Python function will compute the first available VLAN ID; developers plan to code it first and only later try a few examples manually. Which observed result is the most direct acceptance evidence?

  1. A changed CSV formatter passes independent tests without modifying the HTTP retrieval function.
  2. The new test fails against an empty implementation and passes after the correct selection function is added.
  3. The disabled flag evaluates false and the integer retry count remains zero without string comparisons.
  4. Measured lead time decreases without bypassing security review or deployment verification.

Explanation

Correct Answer

B:

The new test fails against an empty implementation and passes after the correct selection function is added. Recommended implementation: Define an automated failing unit test for reserved and allocated VLAN IDs before implementing selection logic. Why the observation matters: Test-driven development follows red, green, refactor with executable expected behavior.

Incorrect Answers

A:

A changed CSV formatter passes independent tests without modifying the HTTP retrieval function. That observation could confirm Single responsibility for inventory processing, not the current Write a failing test before implementation case. For this case, the decisive observation is: The new test fails against an empty implementation and passes after the correct selection function is added.

C:

The disabled flag evaluates false and the integer retry count remains zero without string comparisons. That observation could confirm Preserve numeric and boolean data types, not the current Write a failing test before implementation case. For this case, the decisive observation is: The new test fails against an empty implementation and passes after the correct selection function is added.

D:

Measured lead time decreases without bypassing security review or deployment verification. That observation could confirm Lean removal of redundant handoffs, not the current Write a failing test before implementation case. For this case, the decisive observation is: The new test fails against an empty implementation and passes after the correct selection function is added.

Question 38

A developer is explaining the underlying technical behavior. A Python function will compute the first available VLAN ID; developers plan to code it first and only later try a few examples manually. Which principle is most relevant to this case?

  1. Classes group state with related behavior while modules organize reusable definitions.
  2. Test-driven development follows red, green, refactor with executable expected behavior.
  3. Nested JSON arrays become Python lists containing dictionary objects.
  4. Branches isolate concurrent work until an intentional integration step.

Explanation

Correct Answer

B:

Test-driven development follows red, green, refactor with executable expected behavior. This mechanism explains Write a failing test before implementation. Action: Define an automated failing unit test for reserved and allocated VLAN IDs before implementing selection logic. Expected confirmation: The new test fails against an empty implementation and passes after the correct selection function is added.

Incorrect Answers

A:

Classes group state with related behavior while modules organize reusable definitions. This relates to Separate classes from modules for network clients. In the current Write a failing test before implementation case the operative principle is: Test-driven development follows red, green, refactor with executable expected behavior.

C:

Nested JSON arrays become Python lists containing dictionary objects. This relates to Parse nested device lists into Python. In the current Write a failing test before implementation case the operative principle is: Test-driven development follows red, green, refactor with executable expected behavior.

D:

Branches isolate concurrent work until an intentional integration step. This relates to Branch isolation for competing fixes. In the current Write a failing test before implementation case the operative principle is: Test-driven development follows red, green, refactor with executable expected behavior.

Question 39

A team does not apply the necessary control or correction. A Python function will compute the first available VLAN ID; developers plan to code it first and only later try a few examples manually. Which resulting failure or risk is most directly relevant?

  1. Without a predeclared failing case, an implementation can encode the author's assumption instead of the requirement.
  2. Relying on the author's summary can miss security-sensitive changes hidden in the patch.
  3. Shared mutable globals can send one site's authorization header to another controller.
  4. Editing one shared local copy invites lost changes and unpredictable releases.

Explanation

Correct Answer

A:

Without a predeclared failing case, an implementation can encode the author's assumption instead of the requirement. This is the direct exposure for Write a failing test before implementation. Mitigate with: Define an automated failing unit test for reserved and allocated VLAN IDs before implementing selection logic. Check success by: The new test fails against an empty implementation and passes after the correct selection function is added.

Incorrect Answers

B:

Relying on the author's summary can miss security-sensitive changes hidden in the patch. This risk occurs in the different Use git diff before reviewing an endpoint change situation. For the given Write a failing test before implementation requirement, the directly relevant risk is: Without a predeclared failing case, an implementation can encode the author's assumption instead of the requirement.

C:

Shared mutable globals can send one site's authorization header to another controller. This risk occurs in the different Separate classes from modules for network clients situation. For the given Write a failing test before implementation requirement, the directly relevant risk is: Without a predeclared failing case, an implementation can encode the author's assumption instead of the requirement.

D:

Editing one shared local copy invites lost changes and unpredictable releases. This risk occurs in the different Branch isolation for competing fixes situation. For the given Write a failing test before implementation requirement, the directly relevant risk is: Without a predeclared failing case, an implementation can encode the author's assumption instead of the requirement.

Question 40

The initial implementation fails or does not meet the expected behavior. A Python function will compute the first available VLAN ID; developers plan to code it first and only later try a few examples manually. Which investigation should be prioritized to diagnose the problem?

  1. Inspect subscriber registration, event dispatch and a controlled down/up notification test.
  2. Inspect namespace declarations and XPath namespace bindings against the returned XML tree.
  3. Capture outbound Content-Type and body bytes, and compare them against the endpoint example.
  4. Inspect test assertions, initial failing run and subsequent focused passing run.

Explanation

Correct Answer

D:

Inspect test assertions, initial failing run and subsequent focused passing run. These are the relevant initial evidence checks for Write a failing test before implementation. Intended action: Define an automated failing unit test for reserved and allocated VLAN IDs before implementing selection logic. Expected success condition: The new test fails against an empty implementation and passes after the correct selection function is added.

Incorrect Answers

A:

Inspect subscriber registration, event dispatch and a controlled down/up notification test. This investigation primarily applies to Observer for device event subscribers, not the current Write a failing test before implementation problem. Prioritize: Inspect test assertions, initial failing run and subsequent focused passing run.

B:

Inspect namespace declarations and XPath namespace bindings against the returned XML tree. This investigation primarily applies to XML namespaces in network configuration, not the current Write a failing test before implementation problem. Prioritize: Inspect test assertions, initial failing run and subsequent focused passing run.

C:

Capture outbound Content-Type and body bytes, and compare them against the endpoint example. This investigation primarily applies to YAML config versus JSON API body, not the current Write a failing test before implementation problem. Prioritize: Inspect test assertions, initial failing run and subsequent focused passing run.

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

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