DNS: DNS Querying

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15 minutes
  • 10 Learning Objectives

About this Hands-on Lab

Name service queries are essential in retrieving information stored in DNS records. We will be using the tools in the `bind-utils` package to perform these requests. In this hands-on lab, we will perform name service queries using the `nslookup`, `host,` and `dig` commands.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Install the bind and bind-utils Packages with yum, Then Start and Enable the named Service
# yum install -y bind bind-utils
# systemctl start named
# systemctl enable named
Use the host Command to Display the Name Servers for the Domain, google.com
# host -t ns google.com
Use the host Command to Display the Mail Servers for google.com
# host -t mx google.com
Resolve the IP Address for ns4.google.com Using the nslookup Command
# nslookup ns4.google.com
Use the nslookup Command to List the Name Servers for google.com
# nslookup -type=ns google.com
Use the nslookup Command to List the Mail Servers Responsible for Mail Exchange for google.com
# nslookup -query=mx google.com
Use the Debug Mode for nslookup to Provide more Details for google.com
# nslookup -debug google.com
Use the dig Command to Resolve the IP for google.com
# dig google.com
Use the dig Command to List the Name Servers for google.com
# dig ns google.com
Using dig, List Only the 4 NS Records for google.com
# dig ns google.com +noall +answer

Additional Resources

The DNS team at ABC Company has just rolled out a new DNS system. Part of this process was implementing three new caching name servers for the satellite offices outside of their main campus. The Technical Lead for Office XYZ has asked us to perform name service queries, to ensure new records are being returned to the offsite offices. He has also asked us to take this opportunity to train another staff member on name service query utilities.

To complete this lab, we must install the bind-utils package, then verify that queries resolve successfully using the nslookup, host, and dig commands.

What are Hands-on Labs

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

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