An API response includes the header `ETag: "abc123"`. What is the primary purpose of this header?

To provide a unique identifier for a specific version of the resource content

To instruct caches to always revalidate the response before serving it

To indicate when the response was last modified

To specify the maximum time a response can be cached

A client has a cached response with both an ETag and a Last-Modified header. The client wants to perform a conditional request. Which approach is most robust?

Send both If-None-Match and If-Modified-Since headers

Send neither header and rely on max-age

A company's API serves configuration data to thousands of IoT devices. The data changes rarely, but when it does change, the company needs to ensure devices receive the update promptly. The API currently sets Cache-Control: public, max-age=86400. What is the most effective way to handle updates?

Change the API endpoint URL to include a version number (e.g., /config/v2)

Send a Cache-Control: no-cache header on the next response

Use a different ETag for the new version

An API endpoint returns a list of product categories that changes only a few times per year. What is the most appropriate caching strategy for this response?

Use no-cache to force revalidation on every request

Use no-store to ensure the data is always fresh

Use a short max-age with the private directive

Use a long max-age with the public directive

CiscoCertified DevNet Professional

Domain 2Objective 3

Identify Ways to Optimize API Usage Through HTTP Cache Controls 350-901 Practice Questions (Page 4)

Part of the 2.0 Using APIs domain, which accounts for 20% of the 350-901 exam. Cisco does not publish an official question count, but from its 120-minute exam (~50–80 total, ~10–16 in this domain), expect 2–3 from this objective — we provide 23 practice questions to prepare you well beyond it. (estimate)

23questions here

5free pages

5concepts

20%of the exam

Questions 16–20

16foundation · easy
An API response includes the header `ETag: "abc123"`. What is the primary purpose of this header?
Select an answer first
17application · medium
A client has a cached response with both an ETag and a Last-Modified header. The client wants to perform a conditional request. Which approach is most robust?
Select an answer first
18foundation · easy
An API client has a cached response with `Last-Modified: Tue, 15 Nov 2022 12:45:26 GMT`. Which header should the client send to perform a conditional request based on this timestamp?
Select an answer first
19application · medium
A company's API serves configuration data to thousands of IoT devices. The data changes rarely, but when it does change, the company needs to ensure devices receive the update promptly. The API currently sets Cache-Control: public, max-age=86400. What is the most effective way to handle updates?
Select an answer first
20foundation · easy
An API endpoint returns a list of product categories that changes only a few times per year. What is the most appropriate caching strategy for this response?
Select an answer first

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