The objective of this lab exercise is for you to learn and understand how to configure DNS on Cisco IOS devices.
Configuring DNS on Cisco IOS devices is a fundamental skill. DNS provides hostnames to Layer 3 address resolution. DNS servers are typically used in large networks with many hosts and internetworking devices. As a Cisco engineer, as well as in the Cisco CCNA exam, you will be expected to know how to configure DNS on Cisco IOS devices.
This lab is suitable for CCENT and CCNA certification exam preparation.
This lab has a difficulty rating of 3/10.
When you are ready for your certification exam, you should complete this lab in no more than 5 minutes.
IMPORTANT NOTE: The objective of this lab is to simply familiarize you with the steps required to configure a Cisco IOS device to communicate with a DNS server. Because there will be no real DNS server configured against which to perform testing, the sole objective of this lab is command familiarity.
Please use any single router or switch to complete this lab.
Configure a hostname on your router or switch.
Configure your router or switch as part of the howtonetwork.com domain. For name resolution, your device should forward traffic to DNS servers 172.16.1.254 or 172.17.1.254.
Configuration and Verification
For reference information on configuring hostnames, please refer to earlier labs.
R1#conf t Enter configuration commands, one per line. End with CTRL/Z. R1(config)#ip domain-name howtonetwork.com R1(config)#ip name-server 172.16.1.254 172.17.1.254 R1(config)#ip domain-lookup R1(config)#end R1#
NOTE: If an actual DNS server was available and was providing name resolution, you could ping or connect to devices based on their hostnames as illustrated below:
R1#ping R3 Translating “R3.howtonetwork.com”...domain server (172.16.1.254) [OK] Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.254.3, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 8/11/16 ms R1#telnet R3 Translating “R3”...domain server (172.16.1.254) [OK] Trying R3.howtonetwork.com (192.168.254.3)... Open User Access Verification Password: R3#