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Alibaba Cloud Content Delivery Network (CDN) is a distributed network built on top of a...

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Alibaba Cloud Content Delivery Network (CDN) is a distributed network built on top of a base network with edge node server clusters distributed across various regions. If a user finds that the CDN cache hit rate is low, the possible reasons are ____________. (Choose three.)

A.

When websites have low access traffic and the files are not popular enough, the CDN will receive fewer requests and result in a lower cache hit rate.

B.

If the cache configuration is inappropriate (e.g., overly short Cache Expiry Time for popular files), this may result in frequent back-to-source operations.

C.

Insufficient bandwidth was selected when enabling the CDN service, making the service capacity reach its limit.

D.

If the origin site has a large number of dynamic resources or mostly non-cacheable content, this can also lead to frequent back-to-source operations.

E.

The HTTP Header setting may cause the cache to fail. In this case, users must check the origin site’s “Cache-Control” and “Expires” settings.

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