Which of the following commands can a network technician use to check whether the DNS server
for a given domain is reachable?

A.
nmap

B.
nbtstat

C.
dig

D.
arp

Explanation:
The command dig is a tool for querying DNS nameservers for information about host addresses,
mail exchanges, nameservers, and related information. This tool can be used from any Linux
(Unix) or Macintosh OS X operating system. The most typical use of dig is to simply query a single
host.