Why do dns root servers hold entries for two-level, Software Engineering

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QUESTION - Name Services

(a) Illustrate with help of a diagram the results of a DNS lookup and an ARP lookup assuming we are using IPv4.

(b) Why do DNS root servers hold entries for two-level names such as ac.mu and un.org, rather than one-level names such as .mu and .org?

(d) Explain the use

(i) of aliases in name services

(ii) of caching servers to enhance availability

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