host

Question 1

host

Answer 1

host is a simple utility for performing DNS lookups. It is normally used to convert names to IP addresses and vice versa.

Question 2

Host

• a, All
• C, Check consistency.
• d, Print debugging.
• i, Obsolete.
• l, List zone.
• r, Non-recursive query.
• T, -U, TCP/UDP (UDP default)
• v, Verbose.
• V, Version
• w, Wait forever.

Answer 2

• c class, Query class(HS, CH, IN(default))
• N ndots, The number of dots that have to be in name for it to be considered absolute.
• t type, Query type: CNAME, NS, SOA, TXT, MX, ANY, etc.
• W time, Timeout: Wait for up to wait seconds for a reply.
• R number, Number of retries for UDP queries.
• m flag, Memory usage debugging.