DNS Round Robin
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DNS round robin is a simple load-balancing technique in which multiple [[a-record|A records]] or [[aaaa-record|AAAA records]] with different [[ip-address|IP addresses]] are associated with a single hostname. [[recursive-dns|Resolvers]] rotate through the addresses in sequence, distributing incoming connections across multiple servers. Because round robin relies on DNS-level randomization rather than session awareness, it provides no health checking or sticky sessions; a failed server continues to receive traffic until the records are manually updated or [[ttl|TTL]] expires. More sophisticated alternatives include Anycast routing, GeoDNS, and application-layer load balancers.
Example
A website with three servers at 1.2.3.4, 1.2.3.5, and 1.2.3.6 can list all three as A records for www.example.com; successive DNS lookups return them in rotation, spreading traffic roughly evenly across all three servers.