If a Cloud CDN-enabled backend service returns content with Cache-Control: max-age=3600, what occurs when a user requests the same resource twice within 20 minutes?

medium📝 Predict Output Q4 of 15

GCP - Cloud Load Balancing

AThe second request bypasses the cache and fetches fresh content from the origin

BThe second request triggers a cache revalidation with the origin server

CThe second request is served from Cloud CDN cache without contacting the origin

DThe cache is invalidated and content is refreshed before serving the second request

Step-by-Step Solution

Solution:

Step 1: Understand Cache-Control max-age
The max-age directive specifies how long the response is considered fresh (3600 seconds = 1 hour).
Step 2: Analyze Request Timing
Since 20 minutes is less than 1 hour, the cached content is still fresh.
Step 3: Cache Behavior
Cloud CDN serves the cached content directly without contacting the origin server.
Final Answer:
The second request is served from Cloud CDN cache without contacting the origin -> Option C
Quick Check:
max-age means content is fresh and served from cache [OK]

Quick Trick: max-age defines freshness; serve from cache if still valid [OK]

Common Mistakes:

Assuming cache revalidation happens before max-age expires
Thinking cache is bypassed on repeated requests
Confusing max-age with no-cache or must-revalidate

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If a Cloud CDN-enabled backend service returns content with Cache-Control: max-age=3600, what occurs when a user requests the same resource twice within 20 minutes?

Step 1: Understand Cache-Control max-age

Step 2: Analyze Request Timing

Step 3: Cache Behavior

Final Answer:

Quick Check:

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