DNS server (see the textbook for definitions of these terms). To accomplish this task, nslookup sends a DNS query to the specified DNS server, receives a DNS reply from thatsame DNS server, and displays the result.1References to figures and sections are for the 7thedition of our text, Computer Networks, A Top-downApproach, 7thed., J.F. Kurose and K.W. Ross, Addison-Wesley/Pearson, 2016.
The above screenshot shows the results of three independent nslookupcommands (displayed in the Windows Command Prompt). In this example, the client host is located on the campus of Polytechnic University in Brooklyn, where the default local DNS server is dns-prime.poly.edu. When running nslookup, if no DNS server is specified, thennslookup sends the query to the default DNS server, which in this case is dns-prime.poly.edu. Consider the first command:nslookup In words, this command is saying “please send me the IP address for the host ;. As shown in the screenshot, the response from this command provides two pieces of information: (1) the name and IP address of the DNS server that provides