In this problem, we use the useful dig tool available on Unix and Linux hosts to explore the hierarchy of DNS servers. Recall that in Figure 2.19, a DNS server in the DNS hierarchy delegates a DNS...

In this problem, we use the useful
dig
tool available on Unix and Linux hosts to explore the hierarchy of DNS servers. Recall that in Figure 2.19, a DNS server in the DNS hierarchy delegates a DNS query to a DNS server lower in the hierarchy, by sending back to the DNS client the name of that lower-level DNS server. First read the man page for
dig, and then answer the following questions.

Starting with a root DNS server (from one of the root servers [a-m].root-servers.net), initiate a sequence of queries for the IP address for your department’s Web server by using
dig.
Show the list of the names of DNS servers in the delegation chain in answering your query.

Please tell me how I should use dig and which part of output I should write for answer this question, best with picture example, thank you!

Extracted text: Root DNS server 4 5 Local DNS server TLD DNS server dns.nyu.edu Authoritative DNS server dns.umass.edu Requesting host cse.nyu.edu gaia.cs.umass.edu Figure 2.19 • Interaction of the various DNS servers (6)