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DevNet Associate (DEVASC) 200-901 Practice Test 17

Question 160

The initial implementation fails or does not meet the expected behavior. An inventory loop gets HTTP 429 and immediately repeats the same request hundreds of times per second. Which investigation should be prioritized to diagnose the problem?

  1. Inspect raw response status line, headers and JSON payload separately.
  2. Inspect response headers, request intervals and maximum attempt count.
  3. Inspect response code, Location header and the newly created object's identifier.
  4. Verify the identifier, endpoint authorization and returned deletion status before retrying.

Explanation

Correct Answer

B:

Inspect response headers, request intervals and maximum attempt count. These are the relevant initial evidence checks for Back off on API rate-limit response. Intended action: Honor Retry-After or documented rate windows, applying bounded exponential backoff and jitter where appropriate. Expected success condition: After a simulated limit response, the client waits and succeeds without a tight retry storm.

Incorrect Answers

A:

Inspect raw response status line, headers and JSON payload separately. This investigation primarily applies to Distinguish HTTP headers from response body, not the current Back off on API rate-limit response problem. Prioritize: Inspect response headers, request intervals and maximum attempt count.

C:

Inspect response code, Location header and the newly created object's identifier. This investigation primarily applies to Interpret 201 Created on POST, not the current Back off on API rate-limit response problem. Prioritize: Inspect response headers, request intervals and maximum attempt count.

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 Back off on API rate-limit response problem. Prioritize: Inspect response headers, request intervals and maximum attempt count.

Question 161

A Cisco network automation team has this requirement: A cloud inventory endpoint returns the first 100 clients and a nextCursor, but a report mistakenly treats the first page as the entire fleet. Which design or implementation action best addresses it?

  1. Read the documented Link response header and follow the next relation until it is absent.
  2. Follow the documented cursor until no continuation token remains, combining validated pages.
  3. Fetch current state, reconcile intended changes and resubmit using documented concurrency controls.
  4. Call requests.get(url, params={"site":site}, headers=auth_headers, timeout=(3,10)) and check status.

Explanation

Correct Answer

B:

Follow the documented cursor until no continuation token remains, combining validated pages. Technical reason: Pagination breaks large collections into bounded responses navigated through continuation metadata. Verify by: A fixture of 240 clients produces exactly 240 unique IDs from three pages. Deployment qualification: Cursors may expire and repeated pages require duplicate detection or restart logic.

Incorrect Answers

A:

Read the documented Link response header and follow the next relation until it is absent. This instead targets the different case Parse Link header for next page. The described Traverse cursor-based pagination requirement specifically calls for Follow the documented cursor until no continuation token remains, combining validated pages.

C:

Fetch current state, reconcile intended changes and resubmit using documented concurrency controls. This instead targets the different case 409 Conflict on stale configuration revision. The described Traverse cursor-based pagination requirement specifically calls for Follow the documented cursor until no continuation token remains, combining validated pages.

D:

Call requests.get(url, params={"site":site}, headers=auth_headers, timeout=(3,10)) and check status. This instead targets the different case Use requests.get with params and timeout. The described Traverse cursor-based pagination requirement specifically calls for Follow the documented cursor until no continuation token remains, combining validated pages.

Question 162

After deployment, an engineer must prove the proposed solution works. A cloud inventory endpoint returns the first 100 clients and a nextCursor, but a report mistakenly treats the first page as the entire fleet. Which observed result is the most direct acceptance evidence?

  1. A correctly signed fixture is accepted and a tampered body or invalid signature is rejected.
  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

D:

A fixture of 240 clients produces exactly 240 unique IDs from three pages. Recommended implementation: Follow the documented cursor until no continuation token remains, combining validated pages. Why the observation matters: Pagination breaks large collections into bounded responses navigated through continuation metadata.

Incorrect Answers

A:

A correctly signed fixture is accepted and a tampered body or invalid signature is rejected. That observation could confirm Verify webhook signature on callback, not the current Traverse cursor-based pagination case. For this case, the decisive observation is: A fixture of 240 clients produces exactly 240 unique IDs from three pages.

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 Traverse cursor-based pagination case. For this case, the decisive observation is: A fixture of 240 clients produces exactly 240 unique IDs from three pages.

C:

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

Question 163

A developer is explaining the underlying technical behavior. A cloud inventory endpoint returns the first 100 clients and a nextCursor, but a report mistakenly treats the first page as the entire fleet. Which principle is most relevant to this case?

  1. HTTP Link headers can advertise pagination relations independently of the response body.
  2. Pagination breaks large collections into bounded responses navigated through continuation metadata.
  3. Sessions pool HTTP connections and certificate verification authenticates the remote endpoint.
  4. POST commonly submits a representation to create or process a resource under the target collection.

Explanation

Correct Answer

B:

Pagination breaks large collections into bounded responses navigated through continuation metadata. This mechanism explains Traverse cursor-based pagination. Action: Follow the documented cursor until no continuation token remains, combining validated pages. Expected confirmation: A fixture of 240 clients produces exactly 240 unique IDs from three pages.

Incorrect Answers

A:

HTTP Link headers can advertise pagination relations independently of the response body. This relates to Parse Link header for next page. In the current Traverse cursor-based pagination case the operative principle is: Pagination breaks large collections into bounded responses navigated through continuation metadata.

C:

Sessions pool HTTP connections and certificate verification authenticates the remote endpoint. This relates to Reuse requests Session with certificate verification. In the current Traverse cursor-based pagination case the operative principle is: Pagination breaks large collections into bounded responses navigated through continuation metadata.

D:

POST commonly submits a representation to create or process a resource under the target collection. This relates to POST creates an alarm subscription. In the current Traverse cursor-based pagination case the operative principle is: Pagination breaks large collections into bounded responses navigated through continuation metadata.

Question 164

A team does not apply the necessary control or correction. A cloud inventory endpoint returns the first 100 clients and a nextCursor, but a report mistakenly treats the first page as the entire fleet. Which resulting failure or risk is most directly relevant?

  1. Ignoring Link pagination yields incomplete collections even when each request succeeds.
  2. Ignoring the cursor silently undercounts hosts and produces incomplete security inventory.
  3. Raw URL concatenation and infinite waits can produce wrong filters and stuck jobs.
  4. Unauthenticated callbacks permit forged incidents or unauthorized bot operations.

Explanation

Correct Answer

B:

Ignoring the cursor silently undercounts hosts and produces incomplete security inventory. This is the direct exposure for Traverse cursor-based pagination. Mitigate with: Follow the documented cursor until no continuation token remains, combining validated pages. Check success by: A fixture of 240 clients produces exactly 240 unique IDs from three pages.

Incorrect Answers

A:

Ignoring Link pagination yields incomplete collections even when each request succeeds. This risk occurs in the different Parse Link header for next page situation. For the given Traverse cursor-based pagination requirement, the directly relevant risk is: Ignoring the cursor silently undercounts hosts and produces incomplete security inventory.

C:

Raw URL concatenation and infinite waits can produce wrong filters and stuck jobs. This risk occurs in the different Use requests.get with params and timeout situation. For the given Traverse cursor-based pagination requirement, the directly relevant risk is: Ignoring the cursor silently undercounts hosts and produces incomplete security inventory.

D:

Unauthenticated callbacks permit forged incidents or unauthorized bot operations. This risk occurs in the different Verify webhook signature on callback situation. For the given Traverse cursor-based pagination requirement, the directly relevant risk is: Ignoring the cursor silently undercounts hosts and produces incomplete security inventory.

Question 165

The initial implementation fails or does not meet the expected behavior. A cloud inventory endpoint returns the first 100 clients and a nextCursor, but a report mistakenly treats the first page as the entire fleet. Which investigation should be prioritized to diagnose the problem?

  1. Inspect webhook response latency, delivery attempt history and job deduplication IDs.
  2. Inspect page size, continuation token transitions, collected IDs and terminating response.
  3. Inspect headers, first response bytes and any proxy or captive-portal redirects.
  4. Verify the identifier, endpoint authorization and returned deletion status before retrying.

Explanation

Correct Answer

B:

Inspect page size, continuation token transitions, collected IDs and terminating response. These are the relevant initial evidence checks for Traverse cursor-based pagination. Intended action: Follow the documented cursor until no continuation token remains, combining validated pages. Expected success condition: A fixture of 240 clients produces exactly 240 unique IDs from three pages.

Incorrect Answers

A:

Inspect webhook response latency, delivery attempt history and job deduplication IDs. This investigation primarily applies to Acknowledge webhook quickly and queue work, not the current Traverse cursor-based pagination problem. Prioritize: Inspect page size, continuation token transitions, collected IDs and terminating response.

C:

Inspect headers, first response bytes and any proxy or captive-portal redirects. This investigation primarily applies to Content-Type guards JSON parsing, not the current Traverse cursor-based pagination problem. Prioritize: Inspect page size, continuation token transitions, collected IDs and terminating response.

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 Traverse cursor-based pagination problem. Prioritize: Inspect page size, continuation token transitions, collected IDs and terminating response.

Question 166

A Cisco network automation team has this requirement: A Python collector sometimes waits forever on an unreachable controller because requests.get is called without any timeout. 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. Issue DELETE for the verified unwanted subscription ID, using the documented authentication and method.
  3. Send the required Basic authorization credentials through the HTTP client's supported auth interface over verified HTTPS.
  4. Specify finite connect/read timeouts and an overall bounded retry budget around the request.

Explanation

Correct Answer

D:

Specify finite connect/read timeouts and an overall bounded retry budget around the request. Technical reason: HTTP client timeouts bound resource occupancy during network or server stalls. Verify by: A deliberately unresponsive fixture causes a handled timeout within the defined processing budget. Deployment qualification: An HTTP timeout does not prove the server failed to apply a previously sent mutation.

Incorrect Answers

A:

Read retry timing from response.headers and business inventory values from the decoded response body. This instead targets the different case Distinguish HTTP headers from response body (A script expects rate-limit metadata in response.json()['Retry-After'] although the service places Retry-After in an HTTP header.). The described Control timeouts and retry budget requirement specifically calls for Specify finite connect/read timeouts and an overall bounded retry budget around the request.

B:

Issue DELETE for the verified unwanted subscription ID, using the documented authentication and method. This instead targets the different case DELETE an obsolete webhook subscription. The described Control timeouts and retry budget requirement specifically calls for Specify finite connect/read timeouts and an overall bounded retry budget around the request.

C:

Send the required Basic authorization credentials through the HTTP client's supported auth interface over verified HTTPS. This instead targets the different case Basic authentication for an approved legacy service. The described Control timeouts and retry budget requirement specifically calls for Specify finite connect/read timeouts and an overall bounded retry budget around the request.

Question 167

After deployment, an engineer must prove the proposed solution works. A Python collector sometimes waits forever on an unreachable controller because requests.get is called without any timeout. Which observed result is the most direct acceptance evidence?

  1. After a 304, the client still serves the previously cached valid inventory response.
  2. The authenticated retry succeeds while invalid credentials are rejected consistently.
  3. Incremental changes arrive without one full-inventory HTTP request per event.
  4. A deliberately unresponsive fixture causes a handled timeout within the defined processing budget.

Explanation

Correct Answer

D:

A deliberately unresponsive fixture causes a handled timeout within the defined processing budget. Recommended implementation: Specify finite connect/read timeouts and an overall bounded retry budget around the request. Why the observation matters: HTTP client timeouts bound resource occupancy during network or server stalls.

Incorrect Answers

A:

After a 304, the client still serves the previously cached valid inventory response. That observation could confirm Handle conditional GET with 304, not the current Control timeouts and retry budget case. For this case, the decisive observation is: A deliberately unresponsive fixture causes a handled timeout within the defined processing budget.

B:

The authenticated retry succeeds while invalid credentials are rejected consistently. That observation could confirm 401 Unauthorized on expired bearer token, not the current Control timeouts and retry budget case. For this case, the decisive observation is: A deliberately unresponsive fixture causes a handled timeout within the defined processing budget.

C:

Incremental changes arrive without one full-inventory HTTP request per event. That observation could confirm Event stream versus request-response polling, not the current Control timeouts and retry budget case. For this case, the decisive observation is: A deliberately unresponsive fixture causes a handled timeout within the defined processing budget.

Question 168

A developer is explaining the underlying technical behavior. A Python collector sometimes waits forever on an unreachable controller because requests.get is called without any timeout. Which principle is most relevant to this case?

  1. 401 indicates missing or invalid authentication credentials for the requested resource.
  2. DELETE targets removal of an identified resource rather than editing a collection through GET.
  3. HTTP client timeouts bound resource occupancy during network or server stalls.
  4. Webhook signatures provide message integrity and origin evidence using a secret-derived digest.

Explanation

Correct Answer

C:

HTTP client timeouts bound resource occupancy during network or server stalls. This mechanism explains Control timeouts and retry budget. Action: Specify finite connect/read timeouts and an overall bounded retry budget around the request. Expected confirmation: A deliberately unresponsive fixture causes a handled timeout within the defined processing budget.

Incorrect Answers

A:

401 indicates missing or invalid authentication credentials for the requested resource. This relates to 401 Unauthorized on expired bearer token. In the current Control timeouts and retry budget case the operative principle is: HTTP client timeouts bound resource occupancy during network or server stalls.

B:

DELETE targets removal of an identified resource rather than editing a collection through GET. This relates to DELETE an obsolete webhook subscription. In the current Control timeouts and retry budget case the operative principle is: HTTP client timeouts bound resource occupancy during network or server stalls.

D:

Webhook signatures provide message integrity and origin evidence using a secret-derived digest. This relates to Verify webhook signature on callback. In the current Control timeouts and retry budget case the operative principle is: HTTP client timeouts bound resource occupancy during network or server stalls.

Question 169

A team does not apply the necessary control or correction. A Python collector sometimes waits forever on an unreachable controller because requests.get is called without any timeout. Which resulting failure or risk is most directly relevant?

  1. Raw URL concatenation and infinite waits can produce wrong filters and stuck jobs.
  2. Credentials in query strings may leak in browser history, referer logs and monitoring exports.
  3. Unbounded waits can exhaust worker pools and delay unrelated automation jobs.
  4. Ignoring Link pagination yields incomplete collections even when each request succeeds.

Explanation

Correct Answer

C:

Unbounded waits can exhaust worker pools and delay unrelated automation jobs. This is the direct exposure for Control timeouts and retry budget. Mitigate with: Specify finite connect/read timeouts and an overall bounded retry budget around the request. Check success by: A deliberately unresponsive fixture causes a handled timeout within the defined processing budget.

Incorrect Answers

A:

Raw URL concatenation and infinite waits can produce wrong filters and stuck jobs. This risk occurs in the different Use requests.get with params and timeout situation. For the given Control timeouts and retry budget requirement, the directly relevant risk is: Unbounded waits can exhaust worker pools and delay unrelated automation jobs.

B:

Credentials in query strings may leak in browser history, referer logs and monitoring exports. This risk occurs in the different Bearer token separation from query string situation. For the given Control timeouts and retry budget requirement, the directly relevant risk is: Unbounded waits can exhaust worker pools and delay unrelated automation jobs.

D:

Ignoring Link pagination yields incomplete collections even when each request succeeds. This risk occurs in the different Parse Link header for next page situation. For the given Control timeouts and retry budget requirement, the directly relevant risk is: Unbounded waits can exhaust worker pools and delay unrelated automation jobs.

Question 170

The initial implementation fails or does not meet the expected behavior. A Python collector sometimes waits forever on an unreachable controller because requests.get is called without any timeout. Which investigation should be prioritized to diagnose the problem?

  1. Inspect prepared request URL, response status and simulated timeout handling.
  2. Inspect status code, job location, state transitions and final device evidence.
  3. Inspect connect/read timeout configuration, exception handling and total retry elapsed time.
  4. Compare HTTP verb, required JSON schema and response status with the API reference.

Explanation

Correct Answer

C:

Inspect connect/read timeout configuration, exception handling and total retry elapsed time. These are the relevant initial evidence checks for Control timeouts and retry budget. Intended action: Specify finite connect/read timeouts and an overall bounded retry budget around the request. Expected success condition: A deliberately unresponsive fixture causes a handled timeout within the defined processing budget.

Incorrect Answers

A:

Inspect prepared request URL, response status and simulated timeout handling. This investigation primarily applies to Use requests.get with params and timeout, not the current Control timeouts and retry budget problem. Prioritize: Inspect connect/read timeout configuration, exception handling and total retry elapsed time.

B:

Inspect status code, job location, state transitions and final device evidence. This investigation primarily applies to Interpret 202 Accepted as asynchronous work, not the current Control timeouts and retry budget problem. Prioritize: Inspect connect/read timeout configuration, exception handling and total retry elapsed time.

D:

Compare HTTP verb, required JSON schema and response status with the API reference. This investigation primarily applies to POST creates an alarm subscription, not the current Control timeouts and retry budget problem. Prioritize: Inspect connect/read timeout configuration, exception handling and total retry elapsed time.

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

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