Basic nslookup Operation - Quiz Explanation

The answers you selected are indicated below, along with text that explains the correct answers.
 
1. What is the purpose of the nslookup program?
Please select the best answer.
  A. To provide operating system and architecture information from the DNS database
  B. To specify an IP address-to-host name mapping
  C. To define a specific machine’s alias
  D. To probe the DNS database and generate name server queries
  The correct answer is D.The simplest form of nslookup extracts the A and PTR records.

2. What does the phrase non-authoritative answer in the nslookup output mean?
Please select the best answer.
  A. The information in the nslookup output is probably false
  B. The information in the output was obtained from a server cache
  C. The nslookup program is not finding any information at all
  D. The nslookup program cannot find a name server to query
  The correct answer is B. In such a case, the information in the output will not have been received from an authoritative or secondary server.

3. How can you use nslookup to list an entire zone?
Please select the best answer.
  A. By instructing it to use a different name server with the server command
  B. By instructing it to find the SOA and HINFO record types
  C. By using it as a secondary server for the zone and requesting a file transfer
  D. By instructing it to list authority information and additional information
  The correct answer is C. The nslookup program must be set to use that site’s primary server as its default server.