DNS Server


You are responsible for the network of a major internation hotel organization. You make sure that all the guests can use the Internet services. One of the things you need to do is ensure DNS lookups can be done quickly without relying too much on external DNS servers. You decide to use one of your routers for the job…


  • All IP addresses have been preconfigured for you.
  • OSPF has been preconfigured for full connectivity.
  • Configure router PRIMARY as the primary DNS server for domain “vault.local”. This router should use hostname ns1.vault.local.
  • Configure router SECONDARY as the secondary DNS server for domain “vault.local”. This router should use hostname ns2.vault.local.
  • Router CLIENT1 should be able to resolve the hostnames of the DNS servers.
  • Router CLIENT1 should use both DNS servers by using round-robin.
  • Router CLIENT2 should do DNS lookups by using CLIENT1.
  • Configure a loopback0 interface on router CLIENT1 with IP address /24.
  • Configure the network so CLIENT1 responds with IP address as a DNS response when the DNS servers are unreachable.

It took me 1000s of hours reading books and doing labs, making mistakes over and over again until I mastered all the protocols for CCNA.

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You will learn all the secrets about DNS and more.

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DNS Server

Video Solution:

Configuration Files

You need to register to download the GNS3 topology file. (Registration is free!)

Once you are logged in you will find the configuration files right here.

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Written by René Molenaar - CCIE #41726

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About the Author: Rene Molenaar

René - CCIE #41726 is the creator of GNS3Vault.com where he shares CCNA, CCNP and CCIE R&S labs. He also blogs about networking on http://networklessons.com

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