Practice multi-region latency optimization vocabulary: regional routing, anycast, CDN PoPs, edge caching, and latency measurement terminology.
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'We ___ to the nearest region.' Which verb is used for directing traffic geographically?
'Route to the nearest region' means using geographic DNS or anycast to direct users to the lowest-latency data center. 'Route' is the standard networking verb here.
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'Anycast reduces ___ by 40ms.' Which networking metric is being reduced?
RTT (Round-Trip Time) is the time for a packet to travel from source to destination and back. Anycast reduces RTT by routing users to the nearest PoP rather than a single origin server.
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'The CDN serves static assets from 200+ ___.' What does PoP stand for?
PoP (Point of Presence) is a CDN edge location — a data center where static assets are cached close to end users. More PoPs = lower latency for more users globally.
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'We cache API responses at the ___.' Where is this cache located?
Edge caching places API response caches in CDN PoPs close to users. This reduces the need for requests to travel to the origin server, lowering latency and origin load.
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What does P99 latency mean in latency measurement vocabulary?
P99 (99th percentile latency) is the maximum latency experienced by 99% of requests. It captures the 'worst normal case' and is critical for understanding user experience at scale.