*encryption
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The network administor must have physical access to the device to establish a console connection whereas TELNET access can be established form a remote location. However telnet access depend upon a router with network access's, whereas a console connection can be used to access the router regardless of the router's configuration.
router>enable router#configure terminal router(config)#line vty 0 4 router(config-line)#password cisco router(config-line)#login to configure router with telnet you must set up password or secret for privilieged mode.
Telnet use port number 23,and connected to TCP
Telnet operates over TCP Port 23.
Because the telnet session is in clear text and programs can capture the passwords to log in to telnet sessions.