what is the protocol when connecting to default VLAN network interface?

johnifanx98

Is it telnet?

TechGuru80

Depends on how you have it setup. By just enabling a password on 'line vty 0 4 (or 0 15)' you are using telnet.

Gngogh

i do not consider telnet as a protocol, but i might be wrong.. in my point of view telnet is a layer 7 application that uses tcp/ip protocols to communicate across the network. without tcp/ip telnet is not able to do anything.

JoseJimenez

It is unsecure L7 service/application listening on TCP port 23. It is also a protocol, since it defines set of rules for communication over TCP.
There is also SSH, which is a secure(encrypted) service listening on TCP port 22.

TechGuru80

Telnet is an application layer protocol. TCP/UDP would be a transport layer protocol.