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I wonder what the history of the Cisco CLI's default of "Any unknown command is now a (slow) DNS lookup because maybe you want to telnet ?" is.

It seems to be on almost every single IOS image I've ever touched, so it's got to have been implemented very early

The amount of devices that must have no ip domain-lookup at the top of the config must be staggering. Why does it remain this way.

It's 100% one of the more mundane uses for a time machine