Yes, you can, but this is a very dangerous thing to do. Firstly, telnet is an insecure protocol, and anyone with a packet sniffer can find out your root password. Secondly, one should really never log in as the root account; use su or sudo after logging in as an ordinary user using a more secure protocol such as ssh.
There are some settings in some versions of telnet that may prevent root logins, but the standard telnet will allow that.
The user needs an account and password and responds appropriately when ftp or telnet asks for the credentials.
yes it is possible using telnet that is remote login , i suggest use software team viewer which will help you fix better from remote PC
Your login shell can be changed by using the chsh or ypchsh command.
ssh protocol
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It provides strong authentication and secure communication over insecure channels. When using SSH's login the entire login session, including transmission of text and password is encrypted; therefore it is almost impossible for outsiders to collect passwords.
Telnet is a protocol for transferring plain text over TCP .
Because the telnet session is in clear text and programs can capture the passwords to log in to telnet sessions.
Telnet
check that the login prompt on your console has changed, and use the "show session" command
Pinging a server just checks that Particular system is present on the network. Telnet or SSH are application to login the server from remote and use the services provided by the server. In TELNET DATA is not encrypted so it's easy to hack. In SSH DATA is encrypted so it's safe.