check that the login prompt on your console has changed, and use the "show session" command
what osi layers use telnet connections for remote use
sends data in clear text.need to configure destination device to support telnet connection.
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.
Telnet
Telnet is a Network layer protocol. It is used to create connection remotely.
Might be that remote server connectivity has been lost ..or pls check your ip or login credentials
The most likely reason is that there is no telnet daemon running on the computer. Other reasons may be that you are connecting on the wrong port, or your client is on the hosts.deny list.
Under Windows the command is mstsc.Microsoft terminal server connection
TELNET commands are primarily used to control the TELNET client and manage remote connections. Basic commands include open to connect to a remote host, close to disconnect, status to display connection information, and help to access a list of available commands. Users can also use control characters like Ctrl+] to access the TELNET command prompt for further commands. Additionally, commands such as set and unset allow users to configure various options for their TELNET session.
Telnet
line vty
A single port can be configured to listen for UDP or TCP inbound connection requests (or both). Telnet uses TCP. So when you telnet to a specific IP:port, telnet will attempt to make a TCP connection. If there is no TCP listener on the port you specify, then the connection request will be refused. It matters not if you have a UDP listener on the port. Telnet will not be able to establish a connection to a UDP port.