Names, answers & caches

Domains & DNS

A changed DNS record and a cached DNS answer can coexist. Follow one resolver cache to see why two answers may differ for a while.

concept
DNS TTL
A DNS answer can outlive a change at its source. Follow one resolver cache—not a global propagation clock.
Explore the idea

The DNS TTL example focuses on one saved answer and one clock. It helps explain caching without inventing a single global timer for every resolver or visitor.