PROBLEM: Cisco tries to telnet if you mistype.
SOLUTION: Disable domain-lookup.

[?] What is DNS?
https://www.cloudflare.com/learning/dns/what-is-dns/

//Disable domain-lookup in config terminal mode

Router(config)# no ip domain-lookup

BEFORE

Router# test
Translating "test"...domain server (255.255.255.255)
% Unknown command or computer name, or unable to find computer address

AFTER

Router# test
Translating "test"
% Unknown command or computer name, or unable to find computer address

Copy & Paste

conf t
no ip domain-lookup
end