What does a DNS server do$?$

b$)(2\%)$ What is the main difference between HTTP $1\mathrm{.}0$ and HTTP $1\mathrm{.}1?$

c$)(2\%)$ The original design for e$$mails only allows transmitting ASCII characters.

Describe how the extended design allows e$$mails to transmit multimedia data.

d$)(2\%)$ What is the protocol H$\mathrm{.}323$ designed for?

e$)(2\%)$ Describe briefly how consistent hashing works.