telnet - application layer

ping - network layer
traceroute - network layer
show ip route - netw. l.

show interfaces - datalink l.

debug
no debug all or undebug all
terminal monitor -- forward debug output to your Telnet session terminal
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Elvis>telnet Presley or Elvis>connect Presley or Elvis>Presley or Elvis>10.0.0.1

To resume a session: Elvis>1
Presley>
To suspend a session: Presley> < ctrl >< shift >< 6 >
< x >Elvis>
To disconnect a session: Elvis> disconnect Presley

* show sessions *

Presley>exit or Presley>logout
Elvis>
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traceroute scape sequence = Ctrl-Shift-6