Question: 9 . 2 a ) Explain what the local DNS server does and why does it improve performance for the name resolution protocol. b )

9.2
a) Explain what the local DNS server does and why does it improve performance for the name resolution protocol.
b) Why do you think the tree-like structure of the DNS domain hierarchy made the DNS scalable with the size of the internet?
c) How is caching used for name resolution by DNS servers ? Why is cache eviction important ?

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