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DevNet Associate (DEVASC) 200-901 Practice Test 22

Question 210

The initial implementation fails or does not meet the expected behavior. Two automations modify one template; the second submits an older revision token and receives 409 Conflict. Which investigation should be prioritized to diagnose the problem?

  1. Inspect subscription state, delivery logs, target URL and received event timestamp.
  2. Inspect URL construction, header placement and redacted request traces.
  3. Inspect exception type, logger output and health-check return path under injected faults.
  4. Inspect revision/ETag tokens, competing updates and the diff between desired and current state.

Explanation

Correct Answer

D:

Inspect revision/ETag tokens, competing updates and the diff between desired and current state. These are the relevant initial evidence checks for 409 Conflict on stale configuration revision. Intended action: Fetch current state, reconcile intended changes and resubmit using documented concurrency controls. Expected success condition: The revised request applies without overwriting another team's already committed settings.

Incorrect Answers

A:

Inspect subscription state, delivery logs, target URL and received event timestamp. This investigation primarily applies to Webhook push instead of polling, not the current 409 Conflict on stale configuration revision problem. Prioritize: Inspect revision/ETag tokens, competing updates and the diff between desired and current state.

B:

Inspect URL construction, header placement and redacted request traces. This investigation primarily applies to Bearer token separation from query string, not the current 409 Conflict on stale configuration revision problem. Prioritize: Inspect revision/ETag tokens, competing updates and the diff between desired and current state.

C:

Inspect exception type, logger output and health-check return path under injected faults. This investigation primarily applies to Catch RequestException without hiding failures, not the current 409 Conflict on stale configuration revision problem. Prioritize: Inspect revision/ETag tokens, competing updates and the diff between desired and current state.

Question 211

A Cisco network automation team has this requirement: A POST to a documented JSON-only endpoint returns 415 because the client sends raw YAML with Content-Type text/plain. Which design or implementation action best addresses it?

  1. Construct the documented POST with JSON body, Content-Type and authentication, then inspect the creation response.
  2. Use the documented PATCH operation with the targeted description field and concurrency prerequisites.
  3. Serialize the payload as valid JSON and set the required application/json Content-Type header.
  4. Select the documented RPC or action call for reboot rather than trying to update an unrelated GET resource with an invented field.

Explanation

Correct Answer

C:

Serialize the payload as valid JSON and set the required application/json Content-Type header. Technical reason: 415 indicates the server rejects the submitted representation type. Verify by: The same semantic request is accepted with the proper media type and valid field values. Deployment qualification: Content-Type correctness does not guarantee that required JSON fields are present.

Incorrect Answers

A:

Construct the documented POST with JSON body, Content-Type and authentication, then inspect the creation response. This instead targets the different case POST creates an alarm subscription. The described 415 Unsupported Media Type on JSON endpoint requirement specifically calls for Serialize the payload as valid JSON and set the required application/json Content-Type header.

B:

Use the documented PATCH operation with the targeted description field and concurrency prerequisites. This instead targets the different case PATCH a single interface description. The described 415 Unsupported Media Type on JSON endpoint requirement specifically calls for Serialize the payload as valid JSON and set the required application/json Content-Type header.

D:

Select the documented RPC or action call for reboot rather than trying to update an unrelated GET resource with an invented field. This instead targets the different case RPC action versus REST resource semantics (A management SDK exposes rebootDevice(deviceId) as an action while a REST inventory API exposes /devices/{id} as a resource.). The described 415 Unsupported Media Type on JSON endpoint requirement specifically calls for Serialize the payload as valid JSON and set the required application/json Content-Type header.

Question 212

After deployment, an engineer must prove the proposed solution works. A POST to a documented JSON-only endpoint returns 415 because the client sends raw YAML with Content-Type text/plain. Which observed result is the most direct acceptance evidence?

  1. The server authenticates the lab account and the request does not expose credentials in logs.
  2. The same semantic request is accepted with the proper media type and valid field values.
  3. One event produces one queued job and the provider stops retrying after successful acknowledgement.
  4. A fixture of 240 clients produces exactly 240 unique IDs from three pages.

Explanation

Correct Answer

B:

The same semantic request is accepted with the proper media type and valid field values. Recommended implementation: Serialize the payload as valid JSON and set the required application/json Content-Type header. Why the observation matters: 415 indicates the server rejects the submitted representation type.

Incorrect Answers

A:

The server authenticates the lab account and the request does not expose credentials in logs. That observation could confirm Basic authentication for an approved legacy service, not the current 415 Unsupported Media Type on JSON endpoint case. For this case, the decisive observation is: The same semantic request is accepted with the proper media type and valid field values.

C:

One event produces one queued job and the provider stops retrying after successful acknowledgement. That observation could confirm Acknowledge webhook quickly and queue work, not the current 415 Unsupported Media Type on JSON endpoint case. For this case, the decisive observation is: The same semantic request is accepted with the proper media type and valid field values.

D:

A fixture of 240 clients produces exactly 240 unique IDs from three pages. That observation could confirm Traverse cursor-based pagination, not the current 415 Unsupported Media Type on JSON endpoint case. For this case, the decisive observation is: The same semantic request is accepted with the proper media type and valid field values.

Question 213

A developer is explaining the underlying technical behavior. A POST to a documented JSON-only endpoint returns 415 because the client sends raw YAML with Content-Type text/plain. Which principle is most relevant to this case?

  1. PATCH expresses a partial modification while PUT generally replaces the addressed resource representation.
  2. HTTP Link headers can advertise pagination relations independently of the response body.
  3. Header-based API authentication avoids exposing secrets in ordinary URL records.
  4. 415 indicates the server rejects the submitted representation type.

Explanation

Correct Answer

D:

415 indicates the server rejects the submitted representation type. This mechanism explains 415 Unsupported Media Type on JSON endpoint. Action: Serialize the payload as valid JSON and set the required application/json Content-Type header. Expected confirmation: The same semantic request is accepted with the proper media type and valid field values.

Incorrect Answers

A:

PATCH expresses a partial modification while PUT generally replaces the addressed resource representation. This relates to PATCH a single interface description. In the current 415 Unsupported Media Type on JSON endpoint case the operative principle is: 415 indicates the server rejects the submitted representation type.

B:

HTTP Link headers can advertise pagination relations independently of the response body. This relates to Parse Link header for next page. In the current 415 Unsupported Media Type on JSON endpoint case the operative principle is: 415 indicates the server rejects the submitted representation type.

C:

Header-based API authentication avoids exposing secrets in ordinary URL records. This relates to Bearer token separation from query string. In the current 415 Unsupported Media Type on JSON endpoint case the operative principle is: 415 indicates the server rejects the submitted representation type.

Question 214

A team does not apply the necessary control or correction. A POST to a documented JSON-only endpoint returns 415 because the client sends raw YAML with Content-Type text/plain. Which resulting failure or risk is most directly relevant?

  1. Replacing the authentication token will not repair an incompatible request media type.
  2. Simply deleting the current file does not remove the credential from repository history or attacker copies.
  3. Assuming every remote command is a CRUD field can target an unsupported endpoint.
  4. Putting Basic credentials in a URL leaks them through browser and proxy histories.

Explanation

Correct Answer

A:

Replacing the authentication token will not repair an incompatible request media type. This is the direct exposure for 415 Unsupported Media Type on JSON endpoint. Mitigate with: Serialize the payload as valid JSON and set the required application/json Content-Type header. Check success by: The same semantic request is accepted with the proper media type and valid field values.

Incorrect Answers

B:

Simply deleting the current file does not remove the credential from repository history or attacker copies. This risk occurs in the different Rotate a compromised API key situation. For the given 415 Unsupported Media Type on JSON endpoint requirement, the directly relevant risk is: Replacing the authentication token will not repair an incompatible request media type.

C:

Assuming every remote command is a CRUD field can target an unsupported endpoint. This risk occurs in the different RPC action versus REST resource semantics situation. For the given 415 Unsupported Media Type on JSON endpoint requirement, the directly relevant risk is: Replacing the authentication token will not repair an incompatible request media type.

D:

Putting Basic credentials in a URL leaks them through browser and proxy histories. This risk occurs in the different Basic authentication for an approved legacy service situation. For the given 415 Unsupported Media Type on JSON endpoint requirement, the directly relevant risk is: Replacing the authentication token will not repair an incompatible request media type.

Question 215

The initial implementation fails or does not meet the expected behavior. A POST to a documented JSON-only endpoint returns 415 because the client sends raw YAML with Content-Type text/plain. Which investigation should be prioritized to diagnose the problem?

  1. Inspect request headers, raw payload bytes and accepted media types in API docs.
  2. Inspect raw response status line, headers and JSON payload separately.
  3. Inspect request If-None-Match, response status and stored ETag/body pairing.
  4. Verify the identifier, endpoint authorization and returned deletion status before retrying.

Explanation

Correct Answer

A:

Inspect request headers, raw payload bytes and accepted media types in API docs. These are the relevant initial evidence checks for 415 Unsupported Media Type on JSON endpoint. Intended action: Serialize the payload as valid JSON and set the required application/json Content-Type header. Expected success condition: The same semantic request is accepted with the proper media type and valid field values.

Incorrect Answers

B:

Inspect raw response status line, headers and JSON payload separately. This investigation primarily applies to Distinguish HTTP headers from response body, not the current 415 Unsupported Media Type on JSON endpoint problem. Prioritize: Inspect request headers, raw payload bytes and accepted media types in API docs.

C:

Inspect request If-None-Match, response status and stored ETag/body pairing. This investigation primarily applies to Handle conditional GET with 304, not the current 415 Unsupported Media Type on JSON endpoint problem. Prioritize: Inspect request headers, raw payload bytes and accepted media types in API docs.

D:

Verify the identifier, endpoint authorization and returned deletion status before retrying. This investigation primarily applies to DELETE an obsolete webhook subscription, not the current 415 Unsupported Media Type on JSON endpoint problem. Prioritize: Inspect request headers, raw payload bytes and accepted media types in API docs.

Question 216

A Cisco network automation team has this requirement: A script expects rate-limit metadata in response.json()['Retry-After'] although the service places Retry-After in an HTTP header. Which design or implementation action best addresses it?

  1. Read retry timing from response.headers and business inventory values from the decoded response body.
  2. Specify finite connect/read timeouts and an overall bounded retry budget around the request.
  3. Supply a JSON-serializable mapping through requests.post(..., json=payload) with the required headers.
  4. Select the documented RPC or action call for reboot rather than trying to update an unrelated GET resource with an invented field.

Explanation

Correct Answer

A:

Read retry timing from response.headers and business inventory values from the decoded response body. Technical reason: Headers convey protocol metadata while the body carries a representation of application data. Verify by: The caller obtains the server wait interval and parses the inventory JSON independently. Deployment qualification: Header names are case-insensitive while JSON object key spelling is not necessarily so.

Incorrect Answers

B:

Specify finite connect/read timeouts and an overall bounded retry budget around the request. This instead targets the different case Control timeouts and retry budget. The described Distinguish HTTP headers from response body requirement specifically calls for Read retry timing from response.headers and business inventory values from the decoded response body.

C:

Supply a JSON-serializable mapping through requests.post(..., json=payload) with the required headers. This instead targets the different case Use requests.post json parameter (A client calls requests.post(url, data=str(python_dict)) and the receiver reports malformed JSON.). The described Distinguish HTTP headers from response body requirement specifically calls for Read retry timing from response.headers and business inventory values from the decoded response body.

D:

Select the documented RPC or action call for reboot rather than trying to update an unrelated GET resource with an invented field. This instead targets the different case RPC action versus REST resource semantics (A management SDK exposes rebootDevice(deviceId) as an action while a REST inventory API exposes /devices/{id} as a resource.). The described Distinguish HTTP headers from response body requirement specifically calls for Read retry timing from response.headers and business inventory values from the decoded response body.

Question 217

After deployment, an engineer must prove the proposed solution works. A script expects rate-limit metadata in response.json()['Retry-After'] although the service places Retry-After in an HTTP header. Which observed result is the most direct acceptance evidence?

  1. The captured request body is valid JSON and the server recognizes its expected media type.
  2. The deletion routine completes without JSONDecodeError and a later GET confirms the record is gone.
  3. The caller obtains the server wait interval and parses the inventory JSON independently.
  4. A fixture of 240 clients produces exactly 240 unique IDs from three pages.

Explanation

Correct Answer

C:

The caller obtains the server wait interval and parses the inventory JSON independently. Recommended implementation: Read retry timing from response.headers and business inventory values from the decoded response body. Why the observation matters: Headers convey protocol metadata while the body carries a representation of application data.

Incorrect Answers

A:

The captured request body is valid JSON and the server recognizes its expected media type. That observation could confirm Use requests.post json parameter, not the current Distinguish HTTP headers from response body case. For this case, the decisive observation is: The caller obtains the server wait interval and parses the inventory JSON independently.

B:

The deletion routine completes without JSONDecodeError and a later GET confirms the record is gone. That observation could confirm Interpret 204 No Content, not the current Distinguish HTTP headers from response body case. For this case, the decisive observation is: The caller obtains the server wait interval and parses the inventory JSON independently.

D:

A fixture of 240 clients produces exactly 240 unique IDs from three pages. That observation could confirm Traverse cursor-based pagination, not the current Distinguish HTTP headers from response body case. For this case, the decisive observation is: The caller obtains the server wait interval and parses the inventory JSON independently.

Question 218

A developer is explaining the underlying technical behavior. A script expects rate-limit metadata in response.json()['Retry-After'] although the service places Retry-After in an HTTP header. Which principle is most relevant to this case?

  1. PATCH expresses a partial modification while PUT generally replaces the addressed resource representation.
  2. 202 Accepted means a request was accepted for processing, not necessarily finished.
  3. Headers convey protocol metadata while the body carries a representation of application data.
  4. API versions and schema contracts determine available fields and response representations.

Explanation

Correct Answer

C:

Headers convey protocol metadata while the body carries a representation of application data. This mechanism explains Distinguish HTTP headers from response body. Action: Read retry timing from response.headers and business inventory values from the decoded response body. Expected confirmation: The caller obtains the server wait interval and parses the inventory JSON independently.

Incorrect Answers

A:

PATCH expresses a partial modification while PUT generally replaces the addressed resource representation. This relates to PATCH a single interface description. In the current Distinguish HTTP headers from response body case the operative principle is: Headers convey protocol metadata while the body carries a representation of application data.

B:

202 Accepted means a request was accepted for processing, not necessarily finished. This relates to Interpret 202 Accepted as asynchronous work. In the current Distinguish HTTP headers from response body case the operative principle is: Headers convey protocol metadata while the body carries a representation of application data.

D:

API versions and schema contracts determine available fields and response representations. This relates to Respect versioned API fields. In the current Distinguish HTTP headers from response body case the operative principle is: Headers convey protocol metadata while the body carries a representation of application data.

Question 219

A team does not apply the necessary control or correction. A script expects rate-limit metadata in response.json()['Retry-After'] although the service places Retry-After in an HTTP header. Which resulting failure or risk is most directly relevant?

  1. Blocking the HTTP callback can trigger retries and duplicate work execution.
  2. Searching for headers inside the body can hide rate limits and trigger unnecessary requests.
  3. Using GET for a state-changing create operation violates method semantics and may do nothing.
  4. Changing device routes will not resolve an expired access token.

Explanation

Correct Answer

B:

Searching for headers inside the body can hide rate limits and trigger unnecessary requests. This is the direct exposure for Distinguish HTTP headers from response body. Mitigate with: Read retry timing from response.headers and business inventory values from the decoded response body. Check success by: The caller obtains the server wait interval and parses the inventory JSON independently.

Incorrect Answers

A:

Blocking the HTTP callback can trigger retries and duplicate work execution. This risk occurs in the different Acknowledge webhook quickly and queue work situation. For the given Distinguish HTTP headers from response body requirement, the directly relevant risk is: Searching for headers inside the body can hide rate limits and trigger unnecessary requests.

C:

Using GET for a state-changing create operation violates method semantics and may do nothing. This risk occurs in the different POST creates an alarm subscription situation. For the given Distinguish HTTP headers from response body requirement, the directly relevant risk is: Searching for headers inside the body can hide rate limits and trigger unnecessary requests.

D:

Changing device routes will not resolve an expired access token. This risk occurs in the different 401 Unauthorized on expired bearer token situation. For the given Distinguish HTTP headers from response body requirement, the directly relevant risk is: Searching for headers inside the body can hide rate limits and trigger unnecessary requests.

Question 220

The initial implementation fails or does not meet the expected behavior. A script expects rate-limit metadata in response.json()['Retry-After'] although the service places Retry-After in an HTTP header. Which investigation should be prioritized to diagnose the problem?

  1. Inspect request headers, raw payload bytes and accepted media types in API docs.
  2. Inspect negotiated API version, response body, schema changelog and parser defaults.
  3. Inspect session adapter behavior, certificate trust and request timing with a test endpoint.
  4. Inspect raw response status line, headers and JSON payload separately.

Explanation

Correct Answer

D:

Inspect raw response status line, headers and JSON payload separately. These are the relevant initial evidence checks for Distinguish HTTP headers from response body. Intended action: Read retry timing from response.headers and business inventory values from the decoded response body. Expected success condition: The caller obtains the server wait interval and parses the inventory JSON independently.

Incorrect Answers

A:

Inspect request headers, raw payload bytes and accepted media types in API docs. This investigation primarily applies to 415 Unsupported Media Type on JSON endpoint, not the current Distinguish HTTP headers from response body problem. Prioritize: Inspect raw response status line, headers and JSON payload separately.

B:

Inspect negotiated API version, response body, schema changelog and parser defaults. This investigation primarily applies to Respect versioned API fields, not the current Distinguish HTTP headers from response body problem. Prioritize: Inspect raw response status line, headers and JSON payload separately.

C:

Inspect session adapter behavior, certificate trust and request timing with a test endpoint. This investigation primarily applies to Reuse requests Session with certificate verification, not the current Distinguish HTTP headers from response body problem. Prioritize: Inspect raw response status line, headers and JSON payload separately.

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

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