Question 89 of 179 from exam AZ-204: Developing Solutions for Microsoft Azure

Question 89 of 179 from exam AZ-204: Developing Solutions for Microsoft Azure

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Question

HOTSPOT - You are developing an Azure App Service hosted ASP.NET Core web app to deliver video-on-demand streaming media.

You enable an Azure Content Delivery Network (CDN) Standard for the web endpoint.

Customer videos are downloaded from the web app by using the following example URL: http://www.contoso.com/ content.mp4?quality=1 All media content must expire from the cache after one hour.

Customer videos with varying quality must be delivered to the closest regional point of presence (POP) node.

You need to configure Azure CDN caching rules.

Which options should you use? To answer, select the appropriate options in the answer area.

NOTE: Each correct selection is worth one point.

Hot Area:

Answer Area Setting Caching behavior Cache expiration duration Query string caching behavior Action Bypass cache Override Set if missing 4 second 1 minute 1 hour 1 day Ignore query strings Vv Bypass caching for query strings Cache every unique URL

Explanations

Answer Area Setting Caching behavior Cache expiration duration Query string caching behavior Action Bypass cache Override Set if missing 4 second 1 minute 1 hour 1 day Ignore query strings Bypass caching for query strings Cache every unique URL Vv

Box 1: Override - Override: Ignore origin-provided cache duration; use the provided cache duration instead.

This will not override cache-control: no-cache.

Set if missing: Honor origin-provided cache-directive headers, if they exist; otherwise, use the provided cache duration.

Incorrect: Bypass cache: Do not cache and ignore origin-provided cache-directive headers.

Box 2: 1 hour - All media content must expire from the cache after one hour.

Box 3: Cache every unique URL - Cache every unique URL: In this mode, each request with a unique URL, including the query string, is treated as a unique asset with its own cache.

For example, the response from the origin server for a request for example.ashx?q=test1 is cached at the POP node and returned for subsequent caches with the same query string.

A request for example.ashx?q=test2 is cached as a separate asset with its own time-to-live setting.

Incorrect Answers: Bypass caching for query strings: In this mode, requests with query strings are not cached at the CDN POP node.

The POP node retrieves the asset directly from the origin server and passes it to the requestor with each request.

Ignore query strings: Default mode.

In this mode, the CDN point-of-presence (POP) node passes the query strings from the requestor to the origin server on the first request and caches the asset.

All subsequent requests for the asset that are served from the POP ignore the query strings until the cached asset expires.

https://docs.microsoft.com/en-us/azure/cdn/cdn-query-string
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