Discuss Alibaba ACA-Developer Exam Topic 3 Question 95

If a user finds that the Content Delivery Network (CDN) cache hit rate is low, what could be the reason? (Number of correct answers: 3)

AWhen the website has low traffic, the CDN will receive fewer requests and this will result in a lower cache hit rate.

BInsufficient bandwidth was selected when enabling the CDN service, causing the service capacity reach its limit too early.

CHTTP Header settings may cause cache misses.

DThe origin site has a large number of dynamic resources.

ECache configuration is inappropriate (ex. overly short Cache Expiry Time for popular files).

Suggested Answer: A, B, E

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12 comments · newest first

Leonora 3 months ago

I agree with both. Also, option E is crucial. Short cache expiry can waste resources.

Silvana 4 months ago

Definitely! And option D too. Dynamic resources can hurt the cache hit rate.

Breana 4 months ago

I think option A makes sense. Low traffic means fewer requests.

Twila 4 months ago

Not sure about the bandwidth thing, seems a bit off to me.

Blythe 4 months ago

Wait, I didn't know cache expiry could affect hit rates!

Maricela 4 months ago

Totally agree, but I wonder if the HTTP headers really matter that much.

Shad 6 months ago

I think dynamic resources are a big factor too.

Percy 6 months ago

A low traffic site can definitely lead to a low cache hit rate.

Clorinda 7 months ago

I’m a bit confused about option A; I thought low traffic wouldn’t necessarily mean a low cache hit rate, but maybe it does if there are fewer requests overall?

Chaya 7 months ago

I practiced a similar question about CDN performance, and I feel like option E about cache configuration is likely a reason for low hit rates.

Marci 7 months ago

I'm not entirely sure, but I think the HTTP Header settings could definitely play a role in cache misses, so maybe option C is correct too.

Nancey 7 months ago

I remember discussing how dynamic resources can really impact cache hit rates, so I think option D might be one of the answers.

Alibaba ACA-Developer Exam - Topic 3 Question 95 Discussion