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Terms of the dns performance

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1. What is the difference between recursive queries and iterative queries of DNS servers, in terms of the DNS performance (discuss this in terms of the number of messages needed and the corresponding delay)?

2. When we retrieve emails from email servers, can we use SMTP? (Please justify your answers).

Reference no: EM131252268

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Terms of the dns performance : 1. What is the difference between recursive queries and iterative queries of DNS servers, in terms of the DNS performance (discuss this in terms of the number of messages needed and the corresponding delay)?
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