请教 路由器ip domain-name的具体用途？

menglibinghe

在网上找了半天，也只找到如下说法：
ip domain-name

    To define a default domain name that the Cisco IOS software uses to complete unqualified host names (names without a dotted-decimal domain name), use the ip domain-name global configuration command. To disable use of the DNS, use the no form of this command.

  但是还是搞不清楚这条命令的具体用途，望大侠指点迷津，最好有例子说明。谢谢！！！