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DNS Resolution Process
The DNS resolution process involves a series of recursive and iterative queries, utilizing a distributed and hierarchical infrastructure of DNS servers, resolvers, and caching mechanisms.
1. Recursive and Iterative DNS queries
DNS resolution is the process of converting a domain name into its corresponding IP address. There are two types of DNS queries involved in this process: recursive and iterative queries.
- Recursive query: In a recursive query, the DNS resolver asks for the complete answer to a query from the DNS server
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Ricardo Franco
· 3 years ago
Who decides when to use recursive or iterative queries?
Ricardo Franco
· 3 years ago
Negative caching is the process of caching the non-existence of a DNS record. When a resolver receives a query for a non-existent domain or record, it caches this information as a negative response, preventing repeated queries for the same non-existent resource. This reduces the load on DNS servers and improves overall performance.
How a resolver can prevent a query from arriving on it?
I think the resolver uses negative caching to prevent querying DNS servers for non-existent domains. In this case, the text should be "When a resolver receives a response for a non-existent domain". Am I correct?