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Networking Fundamentals · Foundational

DNS Cache

Temporary storage of DNS answers on clients and resolvers for the duration of each record's TTL.

Definition

Caching reduces lookup time and load on DNS servers but can delay propagation of changes. Stale or poisoned caches cause name resolution errors and can be cleared.

Example

ipconfig /flushdns clears the Windows DNS client cache.

Exam tip

Lower TTLs before a planned IP change so caches update faster.

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