Question: 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

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 higher 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.
a. Starting with a root DNS server (from one of the root servers [a-
m].rootservers.net), initiate a sequence of queries for the IP address for your
departments Web server by using dig. Show the list of the names of DNS
servers in the delegation chain in answering your query.
b. Repeat part a) for several popular Web sites, such as google.com, yahoo.com, or
amazon.com.?

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