A Why Would A Host Contact A Dns Server B

(a) Why would a host contact a DNS server?
(b) If a local DNS server does not know the IP address for a host name, what will it do?
(c) What kind of organization must maintain one or more DNS servers?
(d) What is DNS cache poisoning?
(e) Describe the status of DNSSEC.
(f) Why are root servers attacked?

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