Do you observe recursive or iterative DNS queries, or both? What is the main advantage/disadvantage of recursive DNS queries? What is the main advantage/disadvantage of iterative DNS queries?
What will be an ideal response?
For the first 6 pings we observe that the DNS query requests are recursive. For the last one we
observe that it is iterative. This is because the recursive bit is set for all DNS queries originating from Router 3. For the recursive queries there will be a problem of overloading of the root server. Iterative queries prevent the overloading of the root server. The local name servers directly communicate with the authoritative server in the iterative case where as the intermediate or the root servers communicate
with the authoritative servers in the recursive query.
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