The firewall blocks it. Almost all router have telnet port blocked because it's considered dangerous.
telnet
The main advantage of using this is remote access on the network.
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.
SYN flooding
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Password recovery
SSH is more secure than Telnet.
The router will be unable to ping 192.168.1.2. The router has two interfaces that participate in the RIP process. The router will forward the updates for 192.168.1.0 on interface Serial0/0/1. The router is not originating routes for 172.16.1.0.
Telnet is a terminal network that was developed in 1969 and is noit a Telecommunication network. Telnet was one of the firts internet providers providing access to most operating systems via a remote host which is on an open network so it has some security issues.
The command is bad configurate.
All commands sent over Telnet are transmitted in plain text. An intruder on the network could potentially capture ethernet frames as they move across the media. The captured frames could reveal the network configuration including passwords. SSH (Secure Shell) encrypts all data sent between the client and server.