GSLB (Global Server Load Balancing)
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A technique for distributing traffic across multiple geographically dispersed data centres or cloud regions, directing each user to the nearest or healthiest location. GSLB is typically implemented using DNS-based routing: the GSLB system returns different A/AAAA records depending on the client's source IP geolocation, latency measurements, or data-centre health. TTL is set low (30–60 seconds) to enable rapid failover. Cloud providers offer GSLB as managed services (AWS Route 53 Latency Routing, Cloudflare Load Balancing, GCP Cloud Load Balancing). Anycast is an alternative GSLB approach at the network layer, used by CDNs for static assets.