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→EXPLORATION QUESTIONS
== LAB OBJECTIVES DOMAIN NAME SYSTEM RESOURCES== Online References: *[https://en.wikipedia.org/wiki/Test_case Test Case Definition] (Wikipedia definition of a Test Case) ==OBJECTIVE ==
Last week you were introduced to administering a simple authoritative DNS server. This week we will review that topic, but focus on learning a few more resource record types. This lab will also provide the background and tools (such as a test case) that will be used in your assignment #1.
:Find the MX record for senecacollege.ca using the '''dig''' command:<br><source lang="bash">dig senecacollege.ca MX</source>
:Notice that the email servers aren't even a subdomain of senecacollege.ca but a completely different company (Microsoft in this case).<br>In other cases (for example , check the records for ''google.com'') the email servers are within the company's domain.
In rare cases, there may be no MX records associated with a domain (For example: try '''dig littlesvr.ca'''). In this latter case, the server called littlesvr.ca, which is supporting a web-server, is also supporting the email server for the same IPADDR.
A '''TXT''' record is used to store any type of data or information. It is generally considered to be a "user-defined" section in order to provide additional information that the DNS system was not designed to handle or accommodate. For example, a common use of the TXT record is to support '''SPF''': which is a special type of record used to help receiving email servers determine the likelihood that a message is spam.
=== Update Additional Resource Records for Your Domain for VM1 Name Server ===
Configure your '''VM1''' machine (Bind server) to incorporate each of the records discussed above and verify that your records work by DNS query.
=EXPLORATION QUESTIONS=
#What is the purpose of the following types resource records?<ul><li>A</li><li>NS</li><li>MX</li><li>TXT</li><li>PTR</li><li>CNAME<br><br></li></ul>
#Show the steps for using '''nslookup''' for querying the name name cnn.com for each of the record types discussed in the previous question.
#Show the '''host''' commands for querying the name name cnn.com for each of the record types discussed in Question #1.