CCNA mock video:Skillfully master how to shut down DNS query function of router

Lab Exercise 1.7

Objective:
Skillfully master how to shut down DNS query function of router.
Requirements for device
Cisco 7200 series router
Syntax:

Shut down DNS query function in the global configuration mode.
pass4sure(config)#no ip domain lookup

Explanation:
By default, the router DNS query function is enabled, that is when you input a command by mistake which can’t be recognized by Cisco IOS, the router will regard this command as hostname，and then query the DNS server. In general experimental environments, if we have no DNS servers, the useless query will be time-consuming due to the error command. So we shut down this function.

Configuration example 1:
pass4sure#pass4sure
Translating “pass4sure”…domain server (255.255.255.255)
Translating “pass4sure”…domain server (255.255.255.255)
Translating “pass4sure”…domain server (255.255.255.255)
% Unknown command or computer name, or unable to find computer address
pass4sure#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
pass4sure(config)#no ip domain lookup
pass4sure(config)#end
pass4sure#
*Mar 1 03:13:12.371: %SYS-5-CONFIG_I: Configured from console by console
pass4sure#pass4sure
Translating “pass4sure”
% Unknown command or computer name, or unable to find computer address
pass4sure#

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