DNS caching and Resource Resources (RRs)
DNS caching is a system that stores frequently requested queries for a limited time (controlled by TTL). The cached data is kept as resource records (RRs), which conceptually have four main fields:
(Name, Value, Type, TTL)- Name → The domain name the record applies to (e.g.,
example.com). - Value → The actual data stored in the record (e.g., an IP address).
- Type → The kind of record (A, AAAA, MX, CNAME, etc.).
- TTL (Time To Live) → How long the record can stay cached before it must be refreshed.
An interactive HTML app to see how it works.
Where are DNS servers and how do they work – DevOpsLog.pl
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