Alibaba Cloud Content Delivery Network (CDN) is a distributed network that is built and overlaid on the bearer network. Moreover, it is composed of edge node server clusters distributed across different regions.
It replaces the traditional data transmission mode, which is centered on Web servers. If a user finds that the CDN cache hit rate is low while using the CDN, the possible reasons are. (Number of correct answers: 3)
A . When websites have low access traffic and the files are not popular enough, the CDN will receive fewer requests and result in lower cache hit rate.
B . If the cache configuration is inappropriate (ex. 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 reaches the limit.
D . If the origin site has a largo number of dynamic resources or mostly non-cashback content, this can also lead to frequent back-to-source operations.
E . Tho HTTP Header setting may cause the cache to fail. In this case, users must check the origin site’s “Cacho-Control” and “Expires” settings.
Answer: A B E
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