description Google Public DNS Caching Efficiency Overview
Google Public DNS is a recursive Domain Name System service that resolves domain names through the public addresses 8.8.8.8 and 8.8.4.4. Like other recursive resolvers, it caches DNS responses for the duration permitted by each record's time-to-live value, allowing repeated requests to be answered without contacting the full authoritative lookup chain. This caching can reduce lookup latency, but its effect depends on record settings, cache state, and network conditions.
help Google Public DNS Caching Efficiency FAQ
What are the primary IP addresses for Google Public DNS?
The primary IP addresses for Google Public DNS are 8.8.8.8 and 8.8.4.4. These are the recursive Domain Name System servers used to resolve domain names.
How does Google Public DNS handle caching to improve efficiency?
Like other recursive resolvers, it caches DNS responses for the duration permitted by each record's time-to-live (TTL) value. This allows repeated requests for the same domain to be resolved much faster.
Is Google Public DNS a free service to use?
Yes, Google Public DNS is a free service offered by Google. Users can simply change their network settings to use the 8.8.8.8 and 8.8.4.4 addresses.
What happens when the TTL of a cached record expires on Google Public DNS?
Once the time-to-live value expires, Google's servers will discard the cached record. The next time a user requests that domain, the resolver will fetch a fresh record from the authoritative name servers.
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