DNS is a distributed database that functions over an unreliable global network. It begins with thirteen DNS root servers, which do not provide answers directly but redirect requests. Each DNS query can involve multiple steps, often requiring several lookups to authoritative servers. The resolution time for DNS queries, particularly for authentication records, can hinder email delivery speeds significantly. The DNS protocol is somewhat archaic, mainly utilizing retries for error resolution rather than modern error handling techniques, making it susceptible to network issues and delays.
DNS operates as a distributed database across a global unreliable network, beginning with the thirteen root servers that redirect queries rather than provide direct answers.
Each DNS query frequently involves multiple steps, where simple requests may require several sequential lookups to reach authoritative servers, complicating the retrieval process.
The time taken to resolve DNS queries, especially for authentication records, can significantly impact email delivery speed due to reliance on multiple round trips.
DNS protocol lacks modernized features, primarily relying on simple retries for handling errors, which can be detrimental in cases of packet loss or server issues.
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