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DevNet Associate (DEVASC) 200-901 Practice Test 2

Question 10

The initial implementation fails or does not meet the expected behavior. An Ansible inventory is maintained in readable YAML but an automation API accepts only application/json request bodies. Which investigation should be prioritized to diagnose the problem?

  1. Inspect type(value) at each nested level and reproduce against a minimal fixture.
  2. Inspect the parsed node attrib mapping and findtext result with a representative response.
  3. Inspect route functions, model access layer and view templates after a sample field change.
  4. Capture outbound Content-Type and body bytes, and compare them against the endpoint example.

Explanation

Correct Answer

D:

Capture outbound Content-Type and body bytes, and compare them against the endpoint example. These are the relevant initial evidence checks for YAML config versus JSON API body. Intended action: Parse the YAML configuration locally and serialize the API request as JSON matching its declared schema. Expected success condition: The playbook configuration is readable as YAML while the outgoing request passes the service's JSON schema check.

Incorrect Answers

A:

Inspect type(value) at each nested level and reproduce against a minimal fixture. This investigation primarily applies to Parse nested device lists into Python, not the current YAML config versus JSON API body problem. Prioritize: Capture outbound Content-Type and body bytes, and compare them against the endpoint example.

B:

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

C:

Inspect route functions, model access layer and view templates after a sample field change. This investigation primarily applies to MVC isolates controller logic from UI, not the current YAML config versus JSON API body problem. Prioritize: Capture outbound Content-Type and body bytes, and compare them against the endpoint example.

Question 11

A Cisco network automation team has this requirement: An NETCONF reply contains XML elements with namespace-qualified names and a developer's string search cannot reliably locate interface names. 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. Use separate Git branches and review changes before merging into the shared main branch.
  4. Centralize retry handling in a reusable, tested function parameterized by status and retry bounds.

Explanation

Correct Answer

B:

Use an XML parser with explicit namespace mappings to select the required interface elements. Technical reason: XML namespace URIs identify elements independently of the arbitrary displayed prefix. Verify by: A sample reply yields precisely the expected interface names even when namespace prefixes change. Deployment qualification: A default XML namespace still affects element matching even without a visible prefix.

Incorrect Answers

A:

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

C:

Use separate Git branches and review changes before merging into the shared main branch. This instead targets the different case Branch isolation for competing fixes. The described XML namespaces in network configuration requirement specifically calls for Use an XML parser with explicit namespace mappings to select the required interface elements.

D:

Centralize retry handling in a reusable, tested function parameterized by status and retry bounds. This instead targets the different case Extract repeated API retry logic into a function. The described XML namespaces in network configuration requirement specifically calls for Use an XML parser with explicit namespace mappings to select the required interface elements.

Question 12

After deployment, an engineer must prove the proposed solution works. An NETCONF reply contains XML elements with namespace-qualified names and a developer's string search cannot reliably locate interface names. Which observed result is the most direct acceptance evidence?

  1. All four callers use the same bounded retry behavior when a simulated 429 occurs.
  2. A sample reply yields precisely the expected interface names even when namespace prefixes change.
  3. A harmless mapping parses while a malicious Python-specific constructor is rejected.
  4. Both improvements arrive as distinct commits with an auditable merge history.

Explanation

Correct Answer

B:

A sample reply yields precisely the expected interface names even when namespace prefixes change. Recommended implementation: Use an XML parser with explicit namespace mappings to select the required interface elements. Why the observation matters: XML namespace URIs identify elements independently of the arbitrary displayed prefix.

Incorrect Answers

A:

All four callers use the same bounded retry behavior when a simulated 429 occurs. That observation could confirm Extract repeated API retry logic into a function, not the current XML namespaces in network configuration case. For this case, the decisive observation is: A sample reply yields precisely the expected interface names even when namespace prefixes change.

C:

A harmless mapping parses while a malicious Python-specific constructor is rejected. That observation could confirm Safely parse YAML without object construction, not the current XML namespaces in network configuration case. For this case, the decisive observation is: A sample reply yields precisely the expected interface names even when namespace prefixes change.

D:

Both improvements arrive as distinct commits with an auditable merge history. That observation could confirm Branch isolation for competing fixes, not the current XML namespaces in network configuration case. For this case, the decisive observation is: A sample reply yields precisely the expected interface names even when namespace prefixes change.

Question 13

A developer is explaining the underlying technical behavior. An NETCONF reply contains XML elements with namespace-qualified names and a developer's string search cannot reliably locate interface names. Which principle is most relevant to this case?

  1. XML attributes and child elements are separate constructs in the parsed tree.
  2. XML namespace URIs identify elements independently of the arbitrary displayed prefix.
  3. Nested JSON arrays become Python lists containing dictionary objects.
  4. Git cannot automatically choose incompatible overlapping edits; human resolution creates a coherent merge.

Explanation

Correct Answer

B:

XML namespace URIs identify elements independently of the arbitrary displayed prefix. This mechanism explains XML namespaces in network configuration. Action: Use an XML parser with explicit namespace mappings to select the required interface elements. Expected confirmation: A sample reply yields precisely the expected interface names even when namespace prefixes change.

Incorrect Answers

A:

XML attributes and child elements are separate constructs in the parsed tree. This relates to Distinguish XML attribute from element text. In the current XML namespaces in network configuration case the operative principle is: XML namespace URIs identify elements independently of the arbitrary displayed prefix.

C:

Nested JSON arrays become Python lists containing dictionary objects. This relates to Parse nested device lists into Python. In the current XML namespaces in network configuration case the operative principle is: XML namespace URIs identify elements independently of the arbitrary displayed prefix.

D:

Git cannot automatically choose incompatible overlapping edits; human resolution creates a coherent merge. This relates to Resolve a merge conflict rather than force-push. In the current XML namespaces in network configuration case the operative principle is: XML namespace URIs identify elements independently of the arbitrary displayed prefix.

Question 14

A team does not apply the necessary control or correction. An NETCONF reply contains XML elements with namespace-qualified names and a developer's string search cannot reliably locate interface names. Which resulting failure or risk is most directly relevant?

  1. A broad add can accidentally commit secrets unrelated to the approved change.
  2. Duplicated code can diverge and keep a known rate-limit defect in one workflow.
  3. Matching raw prefix text can miss equivalent elements or select unrelated names.
  4. Treating an attribute as a child element silently loses required inventory identifiers.

Explanation

Correct Answer

C:

Matching raw prefix text can miss equivalent elements or select unrelated names. This is the direct exposure for XML namespaces in network configuration. Mitigate with: Use an XML parser with explicit namespace mappings to select the required interface elements. Check success by: A sample reply yields precisely the expected interface names even when namespace prefixes change.

Incorrect Answers

A:

A broad add can accidentally commit secrets unrelated to the approved change. This risk occurs in the different Stage only the intended file before commit situation. For the given XML namespaces in network configuration requirement, the directly relevant risk is: Matching raw prefix text can miss equivalent elements or select unrelated names.

B:

Duplicated code can diverge and keep a known rate-limit defect in one workflow. This risk occurs in the different Extract repeated API retry logic into a function situation. For the given XML namespaces in network configuration requirement, the directly relevant risk is: Matching raw prefix text can miss equivalent elements or select unrelated names.

D:

Treating an attribute as a child element silently loses required inventory identifiers. This risk occurs in the different Distinguish XML attribute from element text situation. For the given XML namespaces in network configuration requirement, the directly relevant risk is: Matching raw prefix text can miss equivalent elements or select unrelated names.

Question 15

The initial implementation fails or does not meet the expected behavior. An NETCONF reply contains XML elements with namespace-qualified names and a developer's string search cannot reliably locate interface names. Which investigation should be prioritized to diagnose the problem?

  1. Inspect git status and git diff --cached before the commit.
  2. Inspect namespace declarations and XPath namespace bindings against the returned XML tree.
  3. Inspect branch tips, pull requests, conflict resolution and resulting history.
  4. Review loader API, accepted YAML tags, and a controlled rejection test.

Explanation

Correct Answer

B:

Inspect namespace declarations and XPath namespace bindings against the returned XML tree. These are the relevant initial evidence checks for XML namespaces in network configuration. Intended action: Use an XML parser with explicit namespace mappings to select the required interface elements. Expected success condition: A sample reply yields precisely the expected interface names even when namespace prefixes change.

Incorrect Answers

A:

Inspect git status and git diff --cached before the commit. This investigation primarily applies to Stage only the intended file before commit, not the current XML namespaces in network configuration problem. Prioritize: Inspect namespace declarations and XPath namespace bindings against the returned XML tree.

C:

Inspect branch tips, pull requests, conflict resolution and resulting history. This investigation primarily applies to Branch isolation for competing fixes, not the current XML namespaces in network configuration problem. Prioritize: Inspect namespace declarations and XPath namespace bindings against the returned XML tree.

D:

Review loader API, accepted YAML tags, and a controlled rejection test. This investigation primarily applies to Safely parse YAML without object construction, not the current XML namespaces in network configuration problem. Prioritize: Inspect namespace declarations and XPath namespace bindings against the returned XML tree.

Question 16

A Cisco network automation team has this requirement: An API returns {"enabled":false,"retries":0} but a team treats every JSON value as a string when constructing its Python state. Which design or implementation action best addresses it?

  1. Use separate Git branches and review changes before merging into the shared main branch.
  2. Plan short iterations with a prioritized backlog and working increments reviewed by users.
  3. Use yaml.safe_load with schema validation for the untrusted configuration document.
  4. Deserialize JSON into native boolean and numeric types before evaluating policy decisions.

Explanation

Correct Answer

D:

Deserialize JSON into native boolean and numeric types before evaluating policy decisions. Technical reason: JSON booleans and numbers map to typed Python values rather than text representations. Verify by: The disabled flag evaluates false and the integer retry count remains zero without string comparisons. Deployment qualification: A JSON null maps to None and must be handled separately from zero or false.

Incorrect Answers

A:

Use separate Git branches and review changes before merging into the shared main branch. This instead targets the different case Branch isolation for competing fixes. The described Preserve numeric and boolean data types requirement specifically calls for Deserialize JSON into native boolean and numeric types before evaluating policy decisions.

B:

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 Preserve numeric and boolean data types requirement specifically calls for Deserialize JSON into native boolean and numeric types before evaluating policy decisions.

C:

Use yaml.safe_load with schema validation for the untrusted configuration document. This instead targets the different case Safely parse YAML without object construction. The described Preserve numeric and boolean data types requirement specifically calls for Deserialize JSON into native boolean and numeric types before evaluating policy decisions.

Question 17

After deployment, an engineer must prove the proposed solution works. An API returns {"enabled":false,"retries":0} but a team treats every JSON value as a string when constructing its Python state. Which observed result is the most direct acceptance evidence?

  1. The disabled flag evaluates false and the integer retry count remains zero without string comparisons.
  2. The parser obtains Gi1 and integer 1000 from the fixture without searching raw text.
  3. All four callers use the same bounded retry behavior when a simulated 429 occurs.
  4. Both improvements arrive as distinct commits with an auditable merge history.

Explanation

Correct Answer

A:

The disabled flag evaluates false and the integer retry count remains zero without string comparisons. Recommended implementation: Deserialize JSON into native boolean and numeric types before evaluating policy decisions. Why the observation matters: JSON booleans and numbers map to typed Python values rather than text representations.

Incorrect Answers

B:

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

C:

All four callers use the same bounded retry behavior when a simulated 429 occurs. That observation could confirm Extract repeated API retry logic into a function, not the current Preserve numeric and boolean data types case. For this case, the decisive observation is: The disabled flag evaluates false and the integer retry count remains zero without string comparisons.

D:

Both improvements arrive as distinct commits with an auditable merge history. That observation could confirm Branch isolation for competing fixes, not the current Preserve numeric and boolean data types case. For this case, the decisive observation is: The disabled flag evaluates false and the integer retry count remains zero without string comparisons.

Question 18

A developer is explaining the underlying technical behavior. An API returns {"enabled":false,"retries":0} but a team treats every JSON value as a string when constructing its Python state. Which principle is most relevant to this case?

  1. JSON booleans and numbers map to typed Python values rather than text representations.
  2. Nested JSON arrays become Python lists containing dictionary objects.
  3. Waterfall emphasizes phase ordering and upfront specification for stable scopes.
  4. Functions encapsulate repeated behavior behind a single documented interface.

Explanation

Correct Answer

A:

JSON booleans and numbers map to typed Python values rather than text representations. This mechanism explains Preserve numeric and boolean data types. Action: Deserialize JSON into native boolean and numeric types before evaluating policy decisions. Expected confirmation: The disabled flag evaluates false and the integer retry count remains zero without string comparisons.

Incorrect Answers

B:

Nested JSON arrays become Python lists containing dictionary objects. This relates to Parse nested device lists into Python. In the current Preserve numeric and boolean data types case the operative principle is: JSON booleans and numbers map to typed Python values rather than text representations.

C:

Waterfall emphasizes phase ordering and upfront specification for stable scopes. This relates to Waterfall for a tightly approved migration. In the current Preserve numeric and boolean data types case the operative principle is: JSON booleans and numbers map to typed Python values rather than text representations.

D:

Functions encapsulate repeated behavior behind a single documented interface. This relates to Extract repeated API retry logic into a function. In the current Preserve numeric and boolean data types case the operative principle is: JSON booleans and numbers map to typed Python values rather than text representations.

Question 19

A team does not apply the necessary control or correction. An API returns {"enabled":false,"retries":0} but a team treats every JSON value as a string when constructing its Python state. Which resulting failure or risk is most directly relevant?

  1. Duplicated code can diverge and keep a known rate-limit defect in one workflow.
  2. A fixed long specification can lock in an unhelpful interface before operators see a working version.
  3. Shared mutable globals can send one site's authorization header to another controller.
  4. The string "false" is truthy in Python and could mistakenly enable a feature.

Explanation

Correct Answer

D:

The string "false" is truthy in Python and could mistakenly enable a feature. This is the direct exposure for Preserve numeric and boolean data types. Mitigate with: Deserialize JSON into native boolean and numeric types before evaluating policy decisions. Check success by: The disabled flag evaluates false and the integer retry count remains zero without string comparisons.

Incorrect Answers

A:

Duplicated code can diverge and keep a known rate-limit defect in one workflow. This risk occurs in the different Extract repeated API retry logic into a function situation. For the given Preserve numeric and boolean data types requirement, the directly relevant risk is: The string "false" is truthy in Python and could mistakenly enable a feature.

B:

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 Preserve numeric and boolean data types requirement, the directly relevant risk is: The string "false" is truthy in Python and could mistakenly enable a feature.

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 Preserve numeric and boolean data types requirement, the directly relevant risk is: The string "false" is truthy in Python and could mistakenly enable a feature.

Question 20

The initial implementation fails or does not meet the expected behavior. An API returns {"enabled":false,"retries":0} but a team treats every JSON value as a string when constructing its Python state. Which investigation should be prioritized to diagnose the problem?

  1. Inspect the parsed node attrib mapping and findtext result with a representative response.
  2. Inspect function boundaries, call graph and tests for each responsibility.
  3. Check parsed types with isinstance and compare raw payload versus loaded object.
  4. Inspect route functions, model access layer and view templates after a sample field change.

Explanation

Correct Answer

C:

Check parsed types with isinstance and compare raw payload versus loaded object. These are the relevant initial evidence checks for Preserve numeric and boolean data types. Intended action: Deserialize JSON into native boolean and numeric types before evaluating policy decisions. Expected success condition: The disabled flag evaluates false and the integer retry count remains zero without string comparisons.

Incorrect Answers

A:

Inspect the parsed node attrib mapping and findtext result with a representative response. This investigation primarily applies to Distinguish XML attribute from element text, not the current Preserve numeric and boolean data types problem. Prioritize: Check parsed types with isinstance and compare raw payload versus loaded object.

B:

Inspect function boundaries, call graph and tests for each responsibility. This investigation primarily applies to Single responsibility for inventory processing, not the current Preserve numeric and boolean data types problem. Prioritize: Check parsed types with isinstance and compare raw payload versus loaded object.

D:

Inspect route functions, model access layer and view templates after a sample field change. This investigation primarily applies to MVC isolates controller logic from UI, not the current Preserve numeric and boolean data types problem. Prioritize: Check parsed types with isinstance and compare raw payload versus loaded object.

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

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