The default for this command is 'transport input all'. This command, like many commands in the Cisco world does not display if it is in the default configuration. If you replace "all" with a single protocol, that is the only protocol that can access the line. If you use 'transport input telnet ssh', those two protocols are permitted. However, in that case others would be denied (lat, mop, nasi, pad, rlogin, and v120).
I assume those protocols are all beyond CCNA levels paul, correct? I was not aware that there were more protocols. I knew that the "transport input all" was default and never understood why I had to configure "transport input telnet ssh", well now I know why because apparently there are other protocols that will be disallowed with just configuring telnet and ssh. Good info.
Ok, found this topic by mistake and now i'm confused. I've remember reading that the default for this commnad is "transport input telnet", so i took the ICND official cert guide to confirm. In the book it says: "The default is transport input telnet,
omitting the ssh parameter."
So witch one is it? Dose the default changed in the last years considering this is an old topic?
Using SSH on a switch also largely depends on whether the image of the IOS your using actually has encryption. Example in Packet Tracer the "image" used for the 2950 switches don't actually have encryption so you cant actually set up SSH. For his reason trasport input all would allow one or the other and therefore should be used unless desired otherwise. I don't think its important on what is standardised, it should be used on a situational basis unless your rolling it across multiple of the exact same devices ( but you would have your config template already set out for that )
Hope this helps