Cisco CCIE Certification and CCNP Certification FAQs: How do I enable DNS lookups but avoid delays in mistyped commands?

Cisco CCIE Certification and CCNP Certification FAQs :
How do I enable DNS lookups but avoid delays in mistyped commands?

Traditionally, "no ip domain-lookups" is used to stop the delay when you mistype a command. However, this also disables reverse DNS on traceroutes. The solution is

transport preferred none

at the appropriate line (con, vty). This causes mistyped commands to not be interpreted as a connection attempt.

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