DNS takes a distributed, decentralized approach. List three reasons why the designers

of DNS did not take a centralized approach.

$($i$)$ A host at eleceng.edu wants an IP address for comp.eng.edu. Draw the sequence

of messages sent between the servers and hosts in Fig. $2$ to resolve this query using

a iterated query procedure $($in your answer book$).$ Indicate the sequence of the

messages.