CDN (content delivery network): a geographically distributed set of edge servers caching content near end users, cutting latency and offloading the origin.
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What is a cache hit ratio?
Cache hit ratio: the fraction of requests satisfied by the CDN edge cache versus those forwarded to the origin. A higher ratio means lower origin load and faster responses.
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What does cache purging (invalidation) accomplish?
Purge/invalidation: removes stale entries from edge caches so the next request re-fetches from the origin. Useful after deploying updated content that shares the same URL.
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What is an origin shield in CDN architecture?
Origin shield: a designated mid-tier cache that edge nodes query before the origin, reducing duplicate origin fetches and improving the effective hit ratio.
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Why are fingerprinted filenames (e.g. app.4f3a.js) used with CDNs?
Cache busting: embedding a content hash in the filename lets you cache assets aggressively (even immutable) because any change produces a new URL the browser must fetch.