You will be unable to browse websites, send an email, chat online, stream videos, and so on. When DNS is not working devices cannot communicate. Why you must learn the Nslookup command line tool In the examples below I will show you how to query different resource records. The above example used an A resource record which maps a domain name to an IP address. The computer is then able to communicate to .ĭNS uses resource records to provide details about systems on a network.The next DNS server says it knows the IP address and sends the request back to the computer.If it doesn’t know the IP address of the domain it will forward it on to the next DNS server. This can be your local Active Directory DNS server or your ISP DNS server. The DNS server that the client uses may not know the IP address.This will send a query to the DNS server to go fetch the IP address for DNS will take the easy to remember name and map it to the IP address so devices can communicate.īelow I walk through how a computer uses DNS to resolve names. It would be hard to remember the IP address of every website or resource you access, domain names are easier to remember. It will help you identify if it’s a client, a local DNS issue, or another DNS server (forwarding server or ISP).Ĭomputer and other network devices communicate by IP address. Understanding how DNS works will help you troubleshoot DNS issues faster.
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