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Exam Code: 350-401
Exam Name: Implementing Cisco Enterprise Network Core Technologies (ENCOR)
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Implementing Cisco Enterprise Network Core Technologies (ENCOR) 350-401 Practice Test 72

Question 710

A post-change test follows this action: enclose JSON property names and strings in double quotes. Which result demonstrates success?

  1. Decoded JSON retains the intended object and child properties.
  2. The JSON decoder preserves the newline as string content.
  3. A strict JSON parser accepts the corrected payload.
  4. A strict decoder parses the object with the expected key/value pair.

Explanation

Correct Answer

D:

A strict decoder parses the object with the expected key/value pair. This is the targeted operational evidence for the change. JSON string syntax requires double quotation marks. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Build nested objects using braces and arrays using brackets as required. JSON hierarchy represents structured configuration directly. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

B:

This observation validates another operation: Escape the newline as `\n` inside the JSON string. Control characters inside JSON strings require escape sequences. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Remove the trailing comma from the JSON object. Standard JSON does not allow trailing commas in objects or arrays. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 711

An automation client needs a nested JSON object for interface configuration. How should the team implement the required behavior?

  1. Use JSON `null` when the value should be absent rather than a literal word.
  2. Use a JSON string for dotted-decimal address and mask values.
  3. Build nested objects using braces and arrays using brackets as required.
  4. Use JSON boolean `true` without Python capitalization.

Explanation

Correct Answer

C:

JSON hierarchy represents structured configuration directly. The most direct remediation is build nested objects using braces and arrays using brackets as required. A practical acceptance test is decoded JSON retains the intended object and child properties. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: An empty API field is being represented by the string `"null"`. A string and null carry different semantic types. It does not specifically correct the issue here: an automation client needs a nested JSON object for interface configuration.

B:

This choice addresses a different situation: A device API sends IP prefix objects but one mask is unquoted as `255.255.255.0`. Dotted-quad addresses are text values, not JSON numeric literals. It does not specifically correct the issue here: an automation client needs a nested JSON object for interface configuration.

D:

This choice addresses a different situation: A client emits Python `True` inside a JSON payload. JSON literals `true` `false` and `null` have lowercase spelling. It does not specifically correct the issue here: an automation client needs a nested JSON object for interface configuration.

Question 712

During acceptance testing after build nested objects using braces and arrays using brackets as required., which evidence is most relevant?

  1. Decoded field is Python None rather than four-character text.
  2. Decoded JSON retains the intended object and child properties.
  3. A strict JSON parser accepts the dotted-decimal value as string.
  4. The JSON decoder returns a boolean value for the field.

Explanation

Correct Answer

B:

Decoded JSON retains the intended object and child properties. This is the targeted operational evidence for the change. JSON hierarchy represents structured configuration directly. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Use JSON `null` when the value should be absent rather than a literal word. A string and null carry different semantic types. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Use a JSON string for dotted-decimal address and mask values. Dotted-quad addresses are text values, not JSON numeric literals. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

D:

This observation validates another operation: Use JSON boolean `true` without Python capitalization. JSON literals `true` `false` and `null` have lowercase spelling. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 713

An empty API field is being represented by the string `"null"`. What is the most appropriate corrective measure?

  1. Use JSON `null` when the value should be absent rather than a literal word.
  2. Escape the newline as `\n` inside the JSON string.
  3. Remove the trailing comma from the JSON object.
  4. Represent the devices as a JSON array inside the correct object key.

Explanation

Correct Answer

A:

A string and null carry different semantic types. The most direct remediation is use JSON `null` when the value should be absent rather than a literal word. A practical acceptance test is decoded field is Python None rather than four-character text. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A JSON payload contains an unescaped newline inside an ordinary string. Control characters inside JSON strings require escape sequences. It does not specifically correct the issue here: an empty API field is being represented by the string `"null"`.

C:

This choice addresses a different situation: A REST request is rejected because a JSON object has a trailing comma. Standard JSON does not allow trailing commas in objects or arrays. It does not specifically correct the issue here: an empty API field is being represented by the string `"null"`.

D:

This choice addresses a different situation: A JSON API expects a list of network devices and the engineer sends a scalar. JSON arrays use square brackets and contain ordered values. It does not specifically correct the issue here: an empty API field is being represented by the string `"null"`.

Question 714

An operator has applied the following change: use JSON `null` when the value should be absent rather than a literal word. Which observation best confirms it works?

  1. The JSON decoder preserves the newline as string content.
  2. A strict JSON parser accepts the corrected payload.
  3. Parser returns a list with the intended number of device objects.
  4. Decoded field is Python None rather than four-character text.

Explanation

Correct Answer

D:

Decoded field is Python None rather than four-character text. This is the targeted operational evidence for the change. A string and null carry different semantic types. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Escape the newline as `\n` inside the JSON string. Control characters inside JSON strings require escape sequences. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

B:

This observation validates another operation: Remove the trailing comma from the JSON object. Standard JSON does not allow trailing commas in objects or arrays. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Represent the devices as a JSON array inside the correct object key. JSON arrays use square brackets and contain ordered values. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 715

A JSON payload contains an unescaped newline inside an ordinary string. Which action most directly addresses this situation?

  1. Use a JSON string for dotted-decimal address and mask values.
  2. Use JSON boolean `true` without Python capitalization.
  3. Escape the newline as `\n` inside the JSON string.
  4. Enclose JSON property names and strings in double quotes.

Explanation

Correct Answer

C:

Control characters inside JSON strings require escape sequences. The most direct remediation is escape the newline as `\n` inside the JSON string. A practical acceptance test is the JSON decoder preserves the newline as string content. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A device API sends IP prefix objects but one mask is unquoted as `255.255.255.0`. Dotted-quad addresses are text values, not JSON numeric literals. It does not specifically correct the issue here: a JSON payload contains an unescaped newline inside an ordinary string.

B:

This choice addresses a different situation: A client emits Python `True` inside a JSON payload. JSON literals `true` `false` and `null` have lowercase spelling. It does not specifically correct the issue here: a JSON payload contains an unescaped newline inside an ordinary string.

D:

This choice addresses a different situation: An API request uses single-quoted JSON object keys. JSON string syntax requires double quotation marks. It does not specifically correct the issue here: a JSON payload contains an unescaped newline inside an ordinary string.

Question 716

After implementing escape the newline as `\n` inside the JSON string., which operational evidence should an engineer collect?

  1. A strict JSON parser accepts the dotted-decimal value as string.
  2. The JSON decoder preserves the newline as string content.
  3. The JSON decoder returns a boolean value for the field.
  4. A strict decoder parses the object with the expected key/value pair.

Explanation

Correct Answer

B:

The JSON decoder preserves the newline as string content. This is the targeted operational evidence for the change. Control characters inside JSON strings require escape sequences. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Use a JSON string for dotted-decimal address and mask values. Dotted-quad addresses are text values, not JSON numeric literals. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Use JSON boolean `true` without Python capitalization. JSON literals `true` `false` and `null` have lowercase spelling. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

D:

This observation validates another operation: Enclose JSON property names and strings in double quotes. JSON string syntax requires double quotation marks. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 717

A device API sends IP prefix objects but one mask is unquoted as `255.255.255.0`. What is the most effective configuration or design response?

  1. Use a JSON string for dotted-decimal address and mask values.
  2. Remove the trailing comma from the JSON object.
  3. Represent the devices as a JSON array inside the correct object key.
  4. Build nested objects using braces and arrays using brackets as required.

Explanation

Correct Answer

A:

Dotted-quad addresses are text values, not JSON numeric literals. The most direct remediation is use a JSON string for dotted-decimal address and mask values. A practical acceptance test is a strict JSON parser accepts the dotted-decimal value as string. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A REST request is rejected because a JSON object has a trailing comma. Standard JSON does not allow trailing commas in objects or arrays. It does not specifically correct the issue here: a device API sends IP prefix objects but one mask is unquoted as `255.255.255.0`.

C:

This choice addresses a different situation: A JSON API expects a list of network devices and the engineer sends a scalar. JSON arrays use square brackets and contain ordered values. It does not specifically correct the issue here: a device API sends IP prefix objects but one mask is unquoted as `255.255.255.0`.

D:

This choice addresses a different situation: An automation client needs a nested JSON object for interface configuration. JSON hierarchy represents structured configuration directly. It does not specifically correct the issue here: a device API sends IP prefix objects but one mask is unquoted as `255.255.255.0`.

Question 718

The change request says: use a JSON string for dotted-decimal address and mask values. Which verification result is most decisive?

  1. A strict JSON parser accepts the corrected payload.
  2. Parser returns a list with the intended number of device objects.
  3. Decoded JSON retains the intended object and child properties.
  4. A strict JSON parser accepts the dotted-decimal value as string.

Explanation

Correct Answer

D:

A strict JSON parser accepts the dotted-decimal value as string. This is the targeted operational evidence for the change. Dotted-quad addresses are text values, not JSON numeric literals. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Remove the trailing comma from the JSON object. Standard JSON does not allow trailing commas in objects or arrays. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

B:

This observation validates another operation: Represent the devices as a JSON array inside the correct object key. JSON arrays use square brackets and contain ordered values. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Build nested objects using braces and arrays using brackets as required. JSON hierarchy represents structured configuration directly. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 719

A manager wants a machine-readable schema describing device interface configuration. Which action most directly addresses this situation?

  1. Define a `list` with the appropriate key leaf.
  2. Use a YANG `leaf-list` for a set of scalar server addresses.
  3. Use a YANG module instead of a free-form CLI text description.
  4. Respect schema type and units in automation validation.

Explanation

Correct Answer

C:

YANG models define hierarchical nodes, types and constraints. The most direct remediation is use a YANG module instead of a free-form CLI text description. A practical acceptance test is the model exposes typed interface leaves and paths for structured retrieval. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A YANG model requires every interface list entry to be identified by name. A list key uniquely identifies entries within a YANG configuration list. It does not specifically correct the issue here: a manager wants a machine-readable schema describing device interface configuration.

B:

This choice addresses a different situation: A YANG schema must represent several permitted NTP servers. Leaf-list provides multiple values of one scalar type. It does not specifically correct the issue here: a manager wants a machine-readable schema describing device interface configuration.

D:

This choice addresses a different situation: Two YANG leafs use different units but their values look similar. YANG constraints supply meaning beyond the raw serialized number. It does not specifically correct the issue here: a manager wants a machine-readable schema describing device interface configuration.

Question 720

An operator has applied the following change: use a YANG module instead of a free-form CLI text description. Which observation best confirms it works?

  1. Two interface entries are addressed by distinct names in the modeled path.
  2. The model exposes typed interface leaves and paths for structured retrieval.
  3. The modeled node contains several distinct address values.
  4. A validation run rejects out-of-range or incorrectly typed values.

Explanation

Correct Answer

B:

The model exposes typed interface leaves and paths for structured retrieval. This is the targeted operational evidence for the change. YANG models define hierarchical nodes, types and constraints. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Define a `list` with the appropriate key leaf. A list key uniquely identifies entries within a YANG configuration list. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Use a YANG `leaf-list` for a set of scalar server addresses. Leaf-list provides multiple values of one scalar type. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

D:

This observation validates another operation: Respect schema type and units in automation validation. YANG constraints supply meaning beyond the raw serialized number. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

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